SPOILER SYSTEM - C

.
.
•
SPOILER SYSTEM
443. TICHIIICAL TRA.IIIG SQUADRON
••3.
MILITARY AIRLIFT WING, TIIG (MAC)
ALTUI AIR FORCE BAll, OKLAHOMA
2.3 Jun 77
GPO 500
.
...
FOR TRAINING PURPOSES ONLY
NOT NECESSARILY CURRENT AFTER DISTRIBUTION
'
C-141 SPOILER SYSTEM
•'
OBJECTIVES
When you have completed this program, you will be able to:
ii
1. Name the sources of hydraulic pressure during Spoiler operation in
flight and on the ground.
2.
Identify by name the positions of the Spoiler Lever.
3. Identify the Spoiler warning lights and indicators from a photograph
of the various instrument panels.
4.
Identify by name the four positions of the Spoiler Select Switch.
5.
Identify the conditions which will cause the Spoiler warning lights
to illuminate.
6.
Define the function of the High Force Detent and Indicator Pin.
7. List the positions of the Spoiler Select Switch and Spoiler Lever
for takeoff, inflight and landing operations.
8.
List the conditions under which the Spoilers should NOT be deployed
in flight.
9.
Identify the indications of an asymmetric condition.
10. Define the corrective action after an asymmetric condition occurs.
11. List the positions of the Emergency Retract/Emergency Off Switch.
12. Define the use of the Emergency Retract/Emergency Off Switch.
13. List the conditions which will cause the UNDER SPLR SPEED (Under
Spoiler Speed) light to illuminate and define corrective action.
A
INSTRUCTIONS
The format of this booklet is the same as any other book.
It consists
of a statement or frame of instruction and if necessary, a question about
the information to be answered by you. The correct answer or response is
listed on the top of the following page.
You are required to study the statement or frame of information on
each page and if required, answer the question by circling the answer or
filling in the blank. You can then check your answer against the correct
answer at the top of the next page.
If your answer is correct, continue the
program, if wrong, correct it before continuing.
Some pages in this text are for information purposes only and do not
contain questions, in these cases, continue to the next page after studying
the information.
Also included in this text are index pages that list information page
numbers that are valuable in locating the subject sought.
you wish to reread or review, feel free to do so.
B
If at any time
The Wing Spoilers on the C-141 are ELECTRICALLY CONTROLLED, HYDRAULICALLY
OPERATED, HINGED PANELS located just forward of the wing flaps on the UPPER
and LOWER surfaces of each wing. The Spoiler panels are divided into INBOARD
and OUTBOARD sections located on the UPPER and LOWER surfaces of each wing,
with the Spoilers closed, the airflow over and under the wing surface is
relatively smooth with a minimum amount of drag. Opening the Spoilers increases drag.
Study the picture and then select the MOST correct statement below.
A. The Spoiler panels are divided into INBOARD and OUTBOARD sections on
the UPPER surface of each wing.
B. The Spoiler panels consist of single sections located on the UPPER
and LOWER surface of each wing.
~
The Spoiler panels are divided into INBOARD and OUTBOARD sections on
~ the UPPER and LOWER surfaces of each wing.
C. The Spoiler panels are divided into INBOARD and OUTBOARD sections on
the UPPER and LOWER surfaces of each wing.
The purposes of the Spoilers are:
1.
In flight.
a. To act as a speed brake.
b. To allow the pilot to INCREASE the RATE OF DESCENT
without exceeding airspeed or Mach limitations.
2. On the ground.
a. DECREASE the landing ground roll.
b. DECREASE the stopping distance during a Rejected Take-off.
When opened in flight the Spoilers will decrease the rate of descent.
A. TRUE
~
FALSE
2
B.
FALSE
The Spoilers are OPENED to DECREASE the airspeed in flight, to allow
the pilot to INCREASE the Rate of Descent (without exceeding airspeed or
Mach limitations), DECREASE the Landing Ground Roll, and DECREASE the
stopping distance during a Rejected Take-off.
The picture below shows the Spoiler system installation.
Both electrical power and hydraulic pressure are necessary for Spoiler
operation.
If eitheP system is not available, the Spoilers will NOT operate.
First, let's examine the SOURCES of hydraulic pressure used to operate
the Spoilers and how the Landing Gear Lever position influences the source
of hydraulic pressure.
3
Hydraulic Systems Nr 2 and Nr 3 are used to open and close the Spoilers.
But HOW these systems work together to operate the Spoilers depends on the
POSITION of the LANDING GEAR LEVER.
With the Landing Gear Lever in the DOWN position:
1. Hydraulic System Nr 2 operates the INBOARD
Spoiler Sections.
2.
Hydraulic System Nr 3 operates the OUTBOARD
Spoiler Sections.
Study the picture and then answer the statement below.
With the landing Gear lever DOWN, does Hydraulic System Nr 2 operate
the INBOARD Spoiler Sections?
.·~YES
B. NO
4
A. YES
You're getting the picture. With the Landing Gear Lever down, Hydraulic
System Nr 2 operates the inboard sections and Hydraulic System Nr 3 operates
the outboard sections.
Let's place the Landing Gear Lever UP.
Now BOTH hydraulic systems send
pressure to operate ALL SPOILER SECTIONS to overcome the higher air loads
encountered at high airspeeds.
Study the picture and see what I mean.
Which of the following is correct?
~ With the Landing Gear Lever UP, Hydraulic Systems Nr 2 and Nr 3 apply
pressure to all Spoiler sections simultaneously to open or close them.
B. With the Landing Gear Lever UP, Hydraulic System Nr 2 operates the
inboard sections and Hydraulic System Nr 3 operates the outboard
sections to open and close them.
5
A. With the Landing Gear Lever UP, Hydraulic Systems Nr 2 and Nr 3
apply pressure to all Spoiler sections simultaneously to open or
close them.
Real good. Now we know, when the Landing Gear Lever is in the UP position,
both hydraulic systems work together and operate ALL Spoiler sections and with
the Landing Gear Lever in the DOWN position, Hydraulic System Nr. 2 operates
the inboard sections while Hydraulic System Nr 3 operates the outboard
sections.
But -- WHAT happens if either hydraulic system should fail?
No sweat, because the remaining system would then operate ALL Spoiler
sections REGARDLESS of which position the Landing Gear Lever was in.
Naturally, the Spoilers will not move quite so fast with only one hydraulic
system operating, but they will function.
Which statement is correct?
A. With the Landing Gear Lever DOWN, the inboard Spoiler sections would
NOT operate after a Hydraulic System Nr 2 failure.
Should Hydraulic System Nr 2 fail when the Landing Gear Lever is DOWN,
Hydraulic System Nr 3 will operate ALL Spoiler sections, but the rate
of movement will be slower than normal.
6
B. Should Hydraulic System Nr 2 fail when the Landing Gear Lever is DOWN,
Hydraulic System Nr 3 will operate ALL Spoiler sections, but the rate
of movement will be slower than normal.
How right you are! Should either hydraulic system fail, the other
system operates all Spoiler sections regardless of the position of the
Landing Gear Lever, but at a slower than normal speed.
As a review, fill in the statements or circle the correct word(s} below:
then check your answers on Page 8.
1. The Spoiler sections are divided into inboard and ()l)~i ~I)
sections located on the upper and L-l>LAJ~e___
surfaces of each wing.
2. Opening the Spoilers will:
a. Cause the airspeed to (increase} tdecrea~.
b. Allow the pilot to ~creasi) (decrease} his Rate of Descent without exceeding airspeed or Mach limitations.
c. Cause the landing ground roll to (increase}~.
d. Decrease stopping distance during a (Short Field}~}
Take-off.
3. With the Landing Gear Lever DOWN, Hydraulic System Nr 2 operates the
~ (upper} Spoiler sections and Hydraulic System Nr 3 operates
the (~ (lower} Spoiler sections.
4. With the Landing Gear Lever UP, Hydraulic Systems Nr
Nr -~
~
and
apply pressure to all Spoiler sections simultaneously.
5. If Hydraulic System Nr 2 fails, Hydraulic System Nr
~ (only the outboard) Spoiler sections.
7
~
operates
'
ANSWERS TO THE REVIEW
1.
outboard
2.
a. decrease
b.
lower
increase
c. decrease
d. rejected
3.
inboard
4.
2
3
5.
3
all
outboard
If you missed any questions, review the page listed.
1. Spoiler panel location: Page 1
2. Purposes of Spoilers: Page 2
3. Hydraulic sources with the Landing Gear Lever DOWN: Page 4
4. Hydraulic sources with the Landing Gear Lever UP: Page 5
5. Failure of one hydraulic system: Page 6
8
Now we are going to be concerned with the three (3) Spoiler Controls
located on the Control Pedestal:
1.
Spoiler lever
2.
Spoiler Select Switch
3.
Emergency Retract/Emergency Off Switch
~.SPOILER
Sfi.EeT SWITCH
let•s discuss the SPOILER LEVER first.
It provides a means of opening
and closing the Spoilers.
Does this picture show four quadrant markings: RESET, CLOSED, FLT LIMIT,
and GROUND?
(!)
YES
B. NO
9
A. YES
That's right. The four (4) position markings on the Spoiler Lever
quadrant are: RESET, CLOSED, FLT LIMIT and GROUND.
Moving the Spoiler Lever to any of the positions except RESET will position
the Spoilers to the selected position. The Spoiler Lever is spring loaded
from the RESET to the CLOSED position. Moving the Spoiler Lever to any intermediate position between quadrant markings will MOVE the Spoilers to a position
relative to the Spoiler Lever position.
RESET
CLOSED
~
FLT
LIMIT
GROUND
By looking at the picture above, can you see that the Spoilers are
designed to open further on the ground than in flight?
CiJ
YES
B. NO
10
A.
YES
The Spoilers are designed to open further on the ground than in f l ight .
The GROUND position is too much for flight operation .
Here is something else you should know about the SPOILER LEVER.
It has
a solenoid operated HIGH FORCE DETENT at the CLOSED position that serves as
a u>arning
to prevent the pilot from inadvertently deploying the Spoilers \'/hen
the Wing Flaps are NOT full up in flight .
The High Force Detent - - v1hen
engaged-- resists Spoiler Lever movement but can be overridden by app lyi ng
app roximately 50 pounds of force to t he Spoiler Leve r.
When the High Force Detent is engaged , a Spoi l er stop position INDICATOR
PIN located below the Spoi l er Lever sl ot will extend from the face of the
control pedestal .
PIN EXTENDED
PIN RETRACTED
1
It is easier to position the Spoiler Lever when the Spoiler Stop position
INDICATOR PIN is
A.
Extended from the face of the pedestal .
~~ Retracted
from the face of the pedestal .
11
B. Retracted from the face of the pedestal
You are 100% right.
It is easier to position the Spoiler Lever when
the Spoiler Indicator Pin is
Pet~ated
because the High Force Detent is
also roetpaated.
But how can the pilot remove the High Force Detent. Easy, if the wing
flaps are full up, he simply LIFTS the Spoiler Lever. This energizes a
solenoid to remove the High Force Detent.
When the Spoiler Lever is lifted, what happens to the Indicator Pin?
~ It retracts from the face of the pedestal.
B.
It extends from the face of the pedestal.
12
,/
A.
It retracts from the face of the pedestal.
That•s right. Lifting the Spoiler Lever completes the circuit to the
solenoid operated High Force Detent and RETRACTS the Detent and Indicator
Pin.
If the Wing Flaps are NOT full up IN FLIGHT, the High Force Detent
CANNOT BE REMOVED even if the Spoiler Lever is lifted. This waPnB the
pilot when he tries to open the Spoilers. However, the pilot can extend
the Spoilers by applying about 50 pounds of force to the Spoiler lever which
overrides the High Force Detent.
The pilot CANNOT open the Spoilers in flight when the Wing Flaps are
positioned other than full up.
®TRUE
0
FALSE
13
B. FALSE
The pilot CAN open the Spoilers in flight when the wing flaps are NOT
full up by applying approximately 50 pounds of force to the Spoiler Lever to
override the High Force Detent.
However, a WARNING in T.O. 1C-141A-l tells us:
UNDER NO CIRCUMSTANCES SHOULD THE
SPOILERS BE DEPLOYED IN FLIGHT
UNLESS THE FLAPS ARE FULLY RETRACTED
A Cable SERVO, operated by Hydraulic Systems Nr 2 and Nr 3, is located
in the Spoiler Lever Mechanism to provide three primary functions:
1. ASSIST the pilot in moving the Spoiler Lever in EITHER direction.
2. Provide AUTOMATIC Spoiler Lever movement toward the GROUND position
during AUTOMATIC Spoiler opening.
3·. Act as an irreversible mechanism (within the normal spoiler system
blow down limits).
-.
No.2 and/or No.3
HYO. SYSTEMS
TO SPOILER
ACTUATING MECHANISM
The SERVO is hydraulically operated to move the Spoiler Lever automatically, assist the pilot in moving the Spoiler Lever toward the GROUND position
only, and act as an irreversible mechanism.
~ TRUE
(,0
FALSE
14
B. FALSE
The Spoiler Lever is SERVO operated by Hydraulic Systems Nr 2 and Nr 3
to:
1. Assist the pilot in moving the Spoiler Lever during manual
operation, regardless of the direction of movement.
2. Provide automatic Spoiler Lever movement toward the GROUND
position during AUTOMATIC Spoiler opening.
3. Act as an irreversible mechanism.
The Servo will operate on one hydraulic system, but two are used as a
safety precaution.
Now, let•s examine one more function of the Spoiler Lever. Suppose
Hydraulic System Nr 3 isn•t turned ON, when the Spoilers are to be opened.
In this case, moving the Spoiler Lever OUT of the CLOSED position turns
Hydraulic System Nr 3 ON.
Select the correct statement below:
~ Moving
the Spoiler Lever out of the CLOSED position turns ON
Hydraulic System Nr 3, if it isn•t already on.
~
B. Lifting the Spoiler Lever turns ON Hydraulic System Nr 3, if it
isn•t already on.
15
A. Moving the Spoiler Lever out of the CLOSED position turns ON Hydraulic
System Nr 3, if it isn't already on.
Moving the Spoiler Lever out of the CLOSED position turns the Hydraulic
System Nr 3 ON, if it isn't already ON.
Let's review.
1.
Fill in the blanks or circle the correct word(s).
The Spoiler Lever is located on the
instrument panel).
2.
Fill in the names of the four markings located on the Spoiler Lever
quadrant.
KG~ET
a.
b.
c.
d.
3.
GIU>vtv~
--~~----~-------------------
The pilot can select any intermediate position of the Spoiler Lever
between CLOSED and (FLT
LIMIT~.
4. The unit which warns the pilot if he tries to open the Spoilers in
flight when the wing flaps are NOT full up is the High Fore~)
(Stop).
5.
The pilot may remove the High Force Detent in flight if the flaps are
full up by lifting the Spoiler Lever.
~TRUE
~ALSE
16
6.
If the High Force Detent is NOT removed, an Indicator
_p__J_J_·___
protrudes from the face of the console.
e
7. The pilot may override the High Force Detent by
(ten)
applyin~
approximately
pounds of force to the Spoi 1er Lever.
8. The three primary functions of the Servos in the Spoiler Lever mechanism
are to assist the pilot in moving the Spoiler Lever in either direction,
provide AUTOMATIC Spoiler Lever movement toward the GROUND position
during automatic opening, and act as an irreversible mechanism (within
the normal Spoiler System blow down limits.)
QTRUE
B. FALSE
9. The Cable Servo is operated by Hydraulic Systems Nr.
~
and Nr
~
10. Moving the Spoiler Lever out of the closed detent turns the Hydraulic
System Nr ~ON if it isn't already ON.
17
.
ANSWERS TO THE REVI E~!
1.
Control Pedestal
2.
a. RESET
3.
GROUND
b. CLOSED
c. FLT LIMIT
d. GROUND
4. Detent
5. True
6.
Pin
7.
50
8. True
2
9.
3
1o. 3
11. wing flaps
If you missed any questions, review the page listed.
1. Spoiler Lever location: Page 9
2. Spoiler Lever quadrant markings: Page 9
3. Positioning the Spoiler Lever: Page 10
4. High Force Detent purpose:
Page 11
5. Removing the High Force Detent: Page 12
6.
Indicator Pin: Page 11
7. Overriding the High Force Detent: Page 11
8. Functions of the cable servo: Page 14
9. Hydraulic source to operate the servos: Page 14
.
10. Turning on Hydraulic System Nr 3: Page 15
11. Spoiler vs Wing Flap operation: Page 14
•••
18
Okay.
Let's proceed with the other units in the system . We will have
to refer back to the Spoiler Lever from time to time since it operates in
CONJUNCTION WITH the SPOILER SELECT SWITCH .
Notice the LOCATION of the Spoiler Select Switch and the switch position.
From the picture, you can determine that the Spoiler Sel ect Switch is
located just forward of the Spoiler Lever on the Control Pedestal.
RTO
depicts rejected Take-off, FLT is Flight , MAN LAND means Manual Land and
AUTO LAND denotes Automated Land .
The four positions are RTO , FLT , MAN LAND, and AUTO LAND.
( :.) YES
B.
NO
19
A. YES
You're on the right track. The Spoiler Select Switch is located on the
Control Pedestal and has four positions. They are: RTO (Rejected Take-off),
FLT, MAN LAND and AUTO LAND. During normal flight, the Spoiler Select
Switch should remain in the FLT position.
Let's place the Spoiler Select Switch in the FLT POSITION and see how it
affects Spoiler operation. The FLT position does two (2) things:
~RMED
1.
It turns OUT the GROUND LIGHT located on the switch panel.
2.
It places a MECHANICAL STOP at the FLT LIMIT position of the
Spoiler Lever.
Light
GROUND Light
~
The GROUND light
is OUT at this time!
Would you agree that by positioninQ the Spoiler Select Switch to FLT
will accomplish two things:
1.
Illuminate the GROUND light.
2.
Remove the Mechanical Stop from the FLT LIMIT position of the
Spoiler Lever.
A.
YES
,3No
20
B. NO
The FLT position of the Spoiler Select Switch is the ONLY position
which extinguishes the GROUND light and positions the Mechanical Stop. The
G~OUND
light, when illuminated, notifies the pilot he has the switch in
ANY ONE of the THREE GROUND OPERATING positions and the Mechanical Stop is
removed.
21
The pilot does three things to open the Spoilers in flight.
1. Positions the SPOILER SELECT SWITCH to FLT.
2. Lifts the SPOILER LEVER.
3. Moves the SPOILER LEVER out of the CLOSED position.
How will he know that the Spoilers have opened? By checking the
SPOILER POSITION INDICATOR located on the PILOTS' CENTER INSTRUMENT PANEL.
You can determine from the picture below, that the SPOILER POSITION
INDICATOR
A. Has a pointer for each wing labeled "L" and "R".
(~Has a pointer for each wing labeled "L" and "R", and also
has a LOCKED-UNLOCKED flag.
PILOTS' CENTER .
INSTRUMENT PANEL !TYPlCAll
22
B. Has a pointer for each wing labeled "L" and "R", and also has a
LOCKED-UNLOCKED flag.
You're very observant. You noticed the "L" and "R" pointers AND the
LOCKED-UNLOCKED flag located beneath the pointers. The pointers indicate
the position of their respective Inboard Spoiler Sections - left and right
wing. The LOCKED-UNLOCKED flag indicates whether or not all Spoiler sections
are LOCKED CLOSED.
CLOSED~~
( UJHlD I
SJtOI LEI
PO$
Let's assume the pilot opens the Spoilers in flight to decelerate. What
happens, if anything, to the Spoilers if the airspeed is hi9h? For one thing,
above 250 KCAS Spoiler SLOWDOWN occurs.
That is, above 250 KCAS the airflow
(or pressure) against the Spoiler Section forces them towards the closed
position.
Do you believe that Spoiler "blowdown" can be observed on the Spoiler
Position Indicator?
A. YES
B.
NO
23
A.
YES
Sure it can! Spoiler 11 blowdown 11 occurs above 250 KCAS and will be indicated on the Spoiler Position Indicator. How far closed they will go depends
on the airspeed. As the airspeed decreases, the Spoilers will return to the
selected position.
The Spoiler Lever does NOT move during Spoiler 11 blowdown. 11 This is
because the Cable Servo Mechanism contains an irreversible feature to prevent
Spoiler Lever movement within the normal 11 blowdown 11 limits.
One more Spoiler operating limitation. The Spoilers are placarded
against operation above 350 KCAS OR MACH 0.75.
We now have two limitations placed on Spoiler operation in flight. They
should not be opened in flight above:
A. 250 KCAS OR when the wing flaps are NOT full up.
B. 350 KCAS OR when the wing flaps are NOT full up.
24
..
B. 350 KCAS OR when the wing flaps are NOT full up.
Sure. The Spoilers should not be opened in flight above 350 KCAS or
Mach 0.75, and they should NOT be opened in flight unless the wing flaps
are full UP.
This completes the explanation of NORMAL Spoiler operation IN FLIGHT.
Now let•s review. Circle the correct word(s) below and fill in the blanks.
1. During flight, Hydraulic Systems Nr 2 and 3 apply pressure to the inboard and outboard Spoiler sections (together) (independently) to
open and close them.
2.
If one hydraulic system fails, the other will operate the Spoilers,
but at a (reduced) (faster) rate of speed.
3. With the wing flaps full up, lifting the Spoiler Lever removes the High
Force (Detent) {Stop) located at the (CLOSED) (GROUND) position of the
Spoiler Lever.
4. Movement of the Spoiler Lever out of the CLOSED position is aided by th
(Servo) {Tabs) operated by Hydraulic Systems Nr 2 and Nr 3.
5. The Spoilers should not be opened in flight if the wing flaps are NOT
full (down) (up).
6.
If Hydraulic System Nr 3 is not already turned on, moving the Spoiler
lever out of the {CLOSED) (GROUND) position turns it on.
7. A Spoiler Position Indicator located on the pilots• (left) (center)
Instrument panel indicates Spoiler position and also indicates when the
Spoilers are {LOCKED - UNLOCKED) or (OPEN - CLOSED).
25
8. Spoiler 11 blow-down 11 occurs above (250) (200) KCAS.
9. The Spoilers should not be opened above (300) (350) KCAS or Mach
{1.1) (0.75).
10.
Insert the names of the Spoiler Select Switch positions.
11. Moving the Spoiler Select Switch to FLT turns OUT the (GROUND) (ARMED)
light and places a Mechanical (Detent) (Stop) at the FLT LIMIT position
of the Spoiler lever.
12.
If the Spoiler Select Switch is in any position other than FLT, the
GROUND light will illuminate and the Mechanical Stop will be (in place
at) (removed from) the FLT LIMIT position of the Spoiler lever.
26
ANSWERS to the REVIEW.
1.
together
2.
reduced
3.
Detent CLOSED
4.
Servos
5.
up
6.
CLOSED
7.
center LOCKED - UNLOCKED
8.
250
9.
350 0. 75
E
10.~
SPOilER
$tLfCT
~~·
11. GROUND Stop
12. removed from
27
How is the High Force Detent removed when the wing flaps are NOT full
up? rt•s accomplished through the Main Landing Gear TOUCHDOWN Switches.
With the Main Landing Gear Struts compressed, the High Force Detent can be
removed even if the wing flaps are NOT full up.
During MAN LAND operation, how can the pilot remove the High Force
Detent after touchdown if the wing flaps are NOT full up?
A. Lift the Spoiler Lever.
B. He cannot remove the High Force Detent during MAN LAND
if the wing flaps are NOT full up.
28
i
•
A. Lift the Spoiler Lever.
You're right! The pilot must lift the Spoiler Lever to remove the High
Force
D~tent.
Compressing the Main Landing Gear Struts simply allows the
High Force Detent to be Pemoved when the wing flaps are not full up.
During the initial touchdown and landing ground roll, not much weight
is placed on the landing gear to compress the struts. To compensate for
this, WHEEL SPIN-UP DETECTORS are installed on the Four {4) FORWARD MAIN
WHEELS ONLY. These SPIN-UP DETECTORS allow the pilot to remove the High
Force Detent when the main gear is rotating at 34-60 knots and above, even
if the struts are NOT compressed.
34-60 KNOTS OR ABOVE
During landing, either the Landing Gear TOUCHDOWN switches OR the
Landing Gear SPIN-UP detectors on the Four {4) Forward Main Wheels will
allow the pilot to remove the High Force Detent by lifting the Spoiler
Lever.
A. TRUE
B.
FALSE
29
A. TRUE
It's true. During landing either the Landing Gear Touchdown Switches
or the Landing Gear Spin-Up Detectors will allow the pilot to remove the
High Force Detent by lifting the Spoiler Lever.
Now how about another
short review.
Circle the correct word(s} or fill in the appropriate blank spaces.
1. Moving the Spoiler Select Switch out of the FLT position will illuminate
the (ARMED} (GROUND} light and removes the Mechanical (Detent} (Stop}
from the FLT LIMIT position of the Spoiler Lever.
2. After the Touchdown Switches or Wheel Spin-Up Detectors are actuated,
lifting the Spoiler Lever will remove the High Force Detent and Indicator Pin and allow the Lever to be moved to the (FLT LIMIT} (GROUND}
position.
CHECK your answers with those listed below and make any necessary
corrections.
1. GROUND Stop
2. GROUND
30
i
•
The AUTO LAND feature provides AUTOMATIC SPOILER OPENING after touchdown.
When the Spoiler Select Switch and Spoiler Lever are properly set,
the Spoiler Lever will AUTOMATICALLY move to the GROUND position as soon
as Main Landing Gear WHEEL SPIN-UP occurs.
This is how it operates. FIRST the Spoiler Select Switch is positioned
to AUTO LAND. This REMOVES the MECHANICAL STOP from the FLT LIMIT position
of the Spoiler Lever and ILLUMINATES the GROUND light.
Are these two actions (mechanical stop removal and GROUND light
illumination) different from those which occur when the Spoiler Select
Switch is in MAN LAND?
A. YES
B. NO
31
B.
NO
Good!
No difference. Any position of the Spoiler Select Switch, other
than FLT illuminates the GROUND light and removes the Mechanical Stop.
Next, LIFT the Spoiler Lever. This removes the HIGH FORCE DETENT and
ARMS the system for automatic Spoiler opening.
How do we know that the
Spoiler system is armed? The ARMED LIGHT located just forward of the GROUND
light illuminates.
Study the picture, then select the MOST correct statement below.
A. The ARMED and GROUND lights are ILLUMINATED because the Spoiler Select
Switch is in AUTO LAND.
B. The ARMED and GROUND lights are ILLUMINATED because the Spoiler Select
Switch is in AUTO LAND and the Spoiler Lever is LIFTED.
C. Statement nan is correct and the High Force Detent Indicator Pin is
RETRACTED.
32
c.
Statement 11 B11 is correct and the High Force Detent Indicator Pin
is RETRACTED.
How right you are! Setting the Spoiler Select Switch to AUTO LAND
illuminates the GROUND light and removes the Mechanical Stop. With the
Spoiler Select Switch in AUTO LAND, LIFTING the Spoiler Lever:
1. Arms the system.
2.
Illuminates the ARMED light
3. Removes the High Force Detent.
4.
Retracts the Indicator Pin.
The next step is the landing. As soon as WHEEL SPIN-UP is achieved on
the 4 forward main wheels after touchdown (34-60 knots or above), the
Spoiler Lever automatically moves to the GROUND position by action of the
CABLE SERVO MECHANISM. This action opens the Spoilers.
Automatic Spoiler opening will be achieved during AUTO LAND Operation,
when the Main Landing Gear struts compress and actuate the touchdown switches.
A. TRUE
B. FALSE
33
B.
FALSE
The Main Landing Gear struts do NOT need to be compressed. The wheel
SPIN-UP detectors cause automatic Spoiler opening during AUTO LAND operation.
The touchdown switches have nothing to do with automatic Spoiler deployment.
However, the touchdown switches turn out the ARMED light after touchdown,
but that's all they do as far as Spoiler operation using AUTO LAND is
concerned.
We have one very important precaution to observe when landing. A
WARNING in T.O. 1C-141A-l tells us:
THE SPOILER HANDLE WILL NOT BE ARMED
UNTIL AFTER THE LANDING GEAR IS SAFELY
ON THE RUNWAY.
If the Spoilers are armed with the Spoiler Select Switch in AUTO LAND,
the Spoilers will open to the full ground position in flight provided the
forward main gear is rotating above auto Spoiler deployment speed. Thus,
the reason for the WARNING stated above.
We have one more position on the Spoiler Select Switch: RTO (Rejected
Take-Off).
RTO provides automatic Spoiler opening if the pilot decides
to reject during the take-off roll.
34
First, turn the Spoiler Select Switch to RTO . This illuminates the
GROUND light and removes the MECHANICAL STOP from the FLT LIMIT position
of the Spoiler Lever.
These two actions are the same as those which occur when the Spoiler
Select Switch is in AUTO LAND or MAN LAND.
A. TRUE
B.
FALSE
35
A. TRUE
You are right! Three of the four positions of the Spoiler Select
Switch (MAN LAND, AUTO LAND and RTO) will illuminate the GROUND light and
remove the Mechanical Stop.
Next, LIFT the Spoiler lever. This removes the High Force Detent and
retracts the Indicator Pin.
It also ARMS the system for Automatic Spoiler
deployment when desired. Study the picture.
From the picture, you can determine that
A. only the GROUND light is illuminated.
B.
both the ARMED and GROUND lights are illuminated.
36
B. Both the ARMED and GROUND lights are illuminated.
Both the ARMED and GROUND lights are ILLUMINATED. Moving the Spoiler
Select Switch out of the FLT position illuminates the GROUND light. Placing
the Spoiler Select Switch in RTO and 11 lifting 11 the Spoiler Lever illuminates
the ARMED light. The ARMED light notifies you when the system is set for
AUTOMATIC Spoiler deployment should you initiate a Rejected Takeoff.
(The ARMED light will NOT illuminate in ftight with the system set for
RTO, due to the action of the Landing Gear TOUCHDOWN Switches.)
If everything is set up for an RTO, how do we achieve AUTOMATIC Spoiler
deployment? Well, two more operations must occur.
First, the Main Landing
Gear WHEEL SPIN-UP Detectors must be actuated {34-60 knots and above);
second, any two symmetPic thPottZes must be moved to the PevePse idZe Pange
oP beyond.
•
By saying any
~s
symmetpic thPottZes must be reversed, means Nr 1
and Nr 4 throttles or Nr 2 and Nr 3 throttles.
A. TRUE
B. FALSE
37
A. TRUE
Excellent! Reversing either the INBOARD throttles or the OUTBOARD
throttles during a Rejected Take-off will cause Spoiler deployment if:
1. The Spoiler Select Switch is set to RTO.
2. The Spoiler Lever is ARMED (lifted).
3. Main Landing Gear Wheel Spin-up has occurred.
(34 to 60 KTS)
How does reversing the throttles accomplish AUTOMATIC Spoiler opening
during a Rejected Take-off?
38
Automatic Spoiler deployment during a Rejected Takeoff is accomplished
through the Spoiler Cable Servo Mechanism. When the Spoiler Select Switch
and Spoiler Lever are properly set for a Rejected Takeoff, reversing both
OUTBOARD throttles allows Hydraulic System Nr 2 to actuate the Spoiler SERVO
which AUTOMATICALLY moves the Spoiler Lever to the GROUND position. Reversing both INBOARD throttles causes Hydraulic System Nr 3 to actuate the
Hydraulic System Nr 2 actuates
Hydraulic System Nr 3 actuates
the Spoiler Servo.
the Spoiler Servo.
If Hydraulic System Nr 2 fails during a Rejected Takeoff and ONLY the
OUTBOARD throttles are reversed, the Spoilers will NOT automatically open
because the SERVO is not actuated. Now answer this.
Do you believe the Spoiler Lever can be manuaZZy moved to the GROUND
position to open the Spoilers under these conditions?
A. YES
B. NO
39
A. YES
I'll bUY that,
In this case (Hydraulic System Nr 2 failure and OUT-
BOARD throttle reversal), the Spoilers can be manuaZZy opened if they do
not automatically open during a Rejected Takeoff. The Cable Servo Mechanism will still operate from
~draulic
System Nr 3, and the Spoilers will
also operate.
Is the opposite true? That is, if the Hydraulic System Nr 3 fails and
only the INBOARD throttles are reversed, can we manually open the Spoilers?
A. YES
B. NO
40
A.
YES
You've got the point. Of course, if both hydraulic systems fail during
a Rejected Takeoff, you are in deep trouble as far as Spoiler operation is
11
11
concerned.
Now let's review AUTO LAND and RTO operation. Fill in the blank
spaces or circle the correct word(s) in the statements below.
1. With the Spoiler Select Switch in AUTO LAND or RTO, lifting the Spoiler
Lever will:
a •. Turn on the (ARMED) (GROUND) light indicating that the system is armed.
b.
Remove the High Force (Stop) (Detent).
c.
Retract the High Force Detent Indicator (Pin) (Stop).
2. During AUTO LAND operation with the Spoilers armed, they will open as
soon as Main Landing Gear Wheel _ _ _ -----occurs.
3. The Spoilers are opened during AUTO LAND and RTO by action of the Spoiler
(Servo) (Reversing} Mechanism.
4. During Rejected Takeoff operation, the Spoilers will NOT OPEN until Main
Landing Gear Wheel Spin-Up occurs and --------throttles are
moved to REVERSE IDLE or beyond.
5.
If Hydraulic System Nr 3 has failed auring a Rejected Takeoff, the
Spoilers will NOT automatically open unless the outboard throttles are
reversed or the Spoiler Lever is (manually) (autcmatically) moved to
the GROUND position.
Check your answers on Page 42, make any necessary corrections.
41
ANSWERS to the REVIEW
1.
a. ARMED
b.
Detent
c. Pin
2.
Spin-Up
3. Servo
4.
symmetric
5. Manually
If you missed any questions review the page listed.
1. Lifting the Spoiler Lever during AUTO LAND and RTO operation:
Pages 32 &36.
2. Main Landing Gear Wheel Spin-Up during AUTO LAND: Page 34.
3. Spoiler Servo operation: Pages 33, 39.
4. Throttle reversal during RTO: Page 37.
5. Hydraulic system failure during RTO:
42
Page 39.
What would happen if the Spoilers on one wing were to open and those
on the other did not open? The answer is obvious, isn•t it? The aircraft
would tend to roll. To prevent this from happening, an ASYMMETRY PROTECTION
SYSTEM is installed on the Spoilers.
This ASYMMETRY PROTECTION SYSTEM detects uneven OUTBOARD Spoiler opening
during approximately the first
inches of Spoiler Drive Tube extension.
2~
The asymmetry detectors are located on the outboard end of each OUTBOARD
Spoiler Drive Tube.
If one OUTBOARD Spoiler Actuator moves
2~
inches while
the other OUTBOARD actuator moves less than 3/4 inch during the initial
operation, TWO things happen.
1. Hydraulic Systems Nr 2 and Nr 3 drive the spoiZers cZosed.
2. Nr 2 SPOILER INOP and Nr 3 SPOILER INOP lights ILLUMINATE.
::::::::::::
;;;;~;;;;:;:;:::::;;;;;;;;::;;:
:_::
::.::;
!'fib-::
:::;:
;:::;::
::::
!!!!!.r::!::::
~H
l::!fl
::::::::::::::::::::::::::::::::::::
::::::
:::
::
:::::::::::::::::
::::;:::::::::
::::
.;;;;:;:::::: ::;;:;:::::::::::;:::::::;:;::;.;::::::::: :::::;:::::::::;::::::::::::;:;;
ANNUNCIATOR PANEL-LEFT SIDE
If the Nr 2 SPOILER INOP and the Nr 3 SPOILER INOP lights illuminate,
the instrument to check would be the
A. Hydraulic Pressure Gage
B. Spoiler Position Indicator
43
B. Spoiler Position Indicator
Sure. The Spoiler Position Indicator should indicate that the Spoilers
have closed.
If the Nr 2 SPOILER INOP and the Nr 3 SPOILER INOP lights
illuminate and the spoiZePs go
cZosed~
we know that an asymmetric condition
has existed. Remember! Asymmetry protection is available on OUTBOARD
sections onZyJ and then onZy during the first 2 1/2 inches of Spoiler Drive
Tube extension.
So far all Spoiler operation has been accomplished through the action of
the cable SERVO Mechanism.
It operates differently during an asymmetric
condition.
When the Spoilers go closed during an asymmetric condition, the Spoiler
Lever Pemains in position.
For example, if the Spoiler Lever was placed to
the FLT LIMIT position and an asymmetric condition occured, it would remain
there and Hydraulic Systems Nr 2 and Nr 3 would apply pressure to the Spoiler
Actuating Mechanisms located in the wings.
The corrective action for an asymmetric condition is to move the Spoiler
Lever forward to the RESET position. This RESETS the Asymmetry Protection
System.
When the Spoiler Lever is moved to RESET, do you believe the Nr 2 SPOILER
INOP and the Nr 3 SPOILER INOP lights will go out?
A.
YES
B.
NO
44
..
fl..
YES
Real good. Moving the Spoiler Lever to RESET after an asymmetric condi-
tion RESETS the system for operation and turns the Nr 2 SPOILER INOP and the
Nr 3 SPOILER INOP lights out.
NOTE: The Spoiler Lever is spring loaded from the RESET
to the CLOSED position.
An electrical malfunction exists if only one SPOILER INOP light illumiIn this case, the Spoilers will remain fully operational.
nates.
:::::;::;::::::::::::::::::::::::::::::::::::::::::::::::::: ::::
~~~
::;:::::::::::: :::::::::::::::::::::::::::::
l~lliii
:i.i
;;:
!i~
~~~~~
mu
IH
=i:i
~~ uj''
:ll
::::.=;:;
:::::::::::;::;
:::.=
·';' :;;
;:1
!!llt!ll:
::::::::: :::::::::::::::
=~==
~ ~~
'!!
I
!::!'!!'!
:::
lili
;::;;c
~ii
:;; ;;, He:::..:::'
lJR
;;::;;;
tm
i:i~:::::::::::::;:
ilia
;:;
m
~=
1"HHr::£Jf:::: :;;jil!lHW
l:::
~::
.E.C;_
g1illilli
:!HH
~ llmF:.;,:.;,:.,~::mmlg
m;'""
""''"""
~n
H~
:::
"~"''
JH
:!!!!.!!
::.:::::.:;
.,,
r:r:r:
"''' ~
1:::~:::-::~
3 SPOILERS INOP
::::::::::_illill:lli:::::_:
:::::::::::::::::::::::::::::::::!::
:::::: ::mlm:l :::::::::::::::::: :::::::::
ANNUNCIATOR PANEL-LEFT SIDE
Is the following statement TRUE or FALSE?
If the Spoiler Lever is moved to the FLT LIMIT position and only Nr 3
SPOILER INOP light illuminates, the Spoiler Position Indicator will indicate
the Spoilers are closed.
A. TRUE
B. FALSE
45
B.
FALSE
.'
You!re right! One SPOILER INOP light does NOT affect Spoiler operation;
therefore, the Spoiler Position Indicator will indicate that the Spoilers
are open to the FLT LIMIT position.
Should the left wing Spoilers stop approximately half way open, and
the right wing Spoilers continue to open, would the Asymmetry Protection
System function?
A.
YES
B. NO
46
B. NO
You're reaLly getting the point now. The Asymmetry Protection System
will NOT function unless it is initiated during the first two and one half
(2~)
inches of Spoiler operation.
One last but very important item about the Asymmetry Protection System
before we proceed on to something else.
Let's assume that the LEFT INBOARD Spoiler Section DID NOT open during
Spoiler operation and the others DID open. Would the Asymmetry Protection
System function under this condition?
A. YES
B. NO
47
B. NO
Excellent! You remembered that the asymmetry detectors are located on
the OUTBOARD Spoilers only.
If an asymmetric condition exists on the INBOARD Spoiler Sections, the
aircraft will tend to roll. The Spoiler Position Indicator TRANSMITTERS
are located on the INBOARD Spoiler Sections. Therefore, the Spoiler
Position Indicator will atso tell us if one inboard Spoiler is open more
than the other. Of course, the corrective action in this situation is
to close the Spoilers.
The next unit to discuss in this book is the EMERGENCY RETRACT/
EMERGENCY OFF Switch.
.'
..
The Emergency
~etract/~ergency ~ff
Switch (hereafter referred to as
the EREO Switch) is used to bypass the Normal Control System, CLOSE the
Spoilers and DEACTIVATE the Spoiler System in the event of a MALFUNCTION.
look at the picture and then select the correct statement below.
SPOIL£1?5
£MER RETRACT
A. The EREO Switch is located on the Pilots• Center Instrument Panel
and has three positions marked:
EMER RETRACT - NORM - EMER OFF.
B. The EREO Switch is located by the Spoiler lever and has three
positions marked:
EMER RETRACT - NORM - EMER OFF.
49
B. The EREO Switch is located by the Spoiler Lever and has three positions
marked: EMER RETRACT - NORM - EMER OFF.
That's it. The EREO Switch is located by the Spoiler Lever and has
three positions: EMER RETRACT- NORM- EMER OFF.
The EREO Switch is normally left in the NORM position. EMER RETRACT
is a momentary position that is SPRING LOADED back to NORM.
EMER RETRACT
position SIMULATES an ASYMMETRICAL CONDITION.
SPOILERS
£MER RETRACT
ND~M
£MER OFT
Since moving the EREO Switch to EMER RETRACT simulates an asymmetrical
condition, is the following statement correct?
When the EREO Switch is momentarily placed to EMER RETRACT, Hydraulic
Systems Nr 2 and Nr 3 drive the Spoilers CLOSED and Nr 2 SPOILER INOP and
Nr 3 SPOILER INOP lights illuminate.
A. YES
B.
NO
50
..
..
A. YES
CORRECT. The EMER RETRACT position causes Hydraulic Systems Nr 2 and
Nr 3 to drive the Spoilers CLOSED and turns on the Nr 2 SPOILER INOP and
the Nr 3 SPOILER INOP lights.
Is this statement correct?
Since EMER RETRACT simulates an assymetrical condition, moving the
Spoiler Lever to RESET will turn out the SPOILER INOP lights and reset
the system.
A.
YES
B. NO
51
A. YES
..
Right again. The system can be RESET and SPOILER INOP lights can be
extinguished by moving the Spoiler lever to RESET. Then the system is
back in operation.
When the EREO Switch is placed to EMER OFF, it will stay in position
and the Spoilers cannot be opened.
SPOILERS
£MER ~ETI<ACT
If the Spoilers are already OPEN when the EREO Switch is placed to
EMER OFF, several events occur.
1.
Nr 2 hydraulic pressure is shut off at the Spoiler Actuating Mechanisms.
2.
Hydraulic System Nr 3 drives the Spoilers CLOSED and then automatically
shuts off at the Spoiler Actuating Mechanisms.
3.
Nr 2 SPOILER INOP and Nr 3 SPOILER INOP lights illuminate.
Is this statement correct?
Before the Nr 3 hydraulic PUMPS will stop operating, the Spoiler lever
will have to be moved to the CLOSED position.
A. YES
B. NO
52
..
A. YES
How true. You recall that HYdraulic System Nr 3 will be turned ON
any time the Spoiler Lever is moved out of the CLOSED position. Shutting
off the pressure at the Spoiler Actuating Mechanism does NOT shut off the
entire system. Before the Nr 3 hydraulic PUMPS can be turned OFF, the
Spoiler Lever must be placed in the CLOSED position.
Which of the following statements do you believe is correct?
A. Before the Spoilers can be used after the EREO Switch is placed in
EMER OFF, the Spoiler Lever must be moved to RESET.
B. Before the Spoilers can be used after the EREO Switch is placed in
EMER OFF, the EREO Switch must be returned to NORM and the Spoiler
Lever moved to RESET.
53
B.
Before the Spoilers can be used after the EREO Switch is placed in
EMER OFF, the EREO Switch must be returned to NORM and the Spoiler
Lever moved to RESET.
..
•
Absolutely right! When the EREO Switch is placed to EMER OFF, it will
stay there.
Before the Spoiler Lever is moved to RESET, the EREO Switch
must be moved to NORM.
If it is not, the system can not be RESET.
A switch has been added 5° pass the FLT POSITION to protect you from
overdeployment of the Spoilers in flight.
It's called the INFLIGHT SPOILER
EXTENSION LOCKOUT. Hith the Landing Gear Lever in the "UP" position
Spoiler retraction will occur regardless of the position of the Spoiler
Select Switch, whenever the Wing Spoiler Lever is moved 5 degrees or more
aft of the FLT LIMIT position.
With the Landing Gear Lever in the "UP" position, Spoiler retraction will
occur whenever the Wing Spoiler Lever is moved 5 degrees or more aft of the
FLT LIMIT position and the Spoiler Select Switch is in
A. the FLT position only
B. any position
54
B. any position
Any position is correct. With the Landing Gear Lever in the 11 UP 11
position, Spoiler retraction will occur regardless of the position of the
Spoiler Select Switch is the Wing Spoiler Lever is moved 5 degrees or
more aft of the FLT LIMIT position.
Throttle switches have been added for automatic Spoiler retraction if
a Go-Around is needed. These are called SPOILER GO-AROUND RETRACT switches.
With the Landing Gear Lever in the 11 00WN 11 position, when any two throttles
(one for each wing) are advanced beyond the 54 degree throttle position, the
Spoilers will automatically retract.
Which of the following conditions will cause the Spoilers to automatically
retract?
A. The Landing Gear Lever must be in the
11
00~1N"
position.
B. One throttle for each wing advanced beyond the 54 degree throttle
position.
C. Both of the above conditions must be accomplished.
55
c.
Both of the above must be accomplished
rt•s true. In order for the Spoilers to automatically retract, the
Landing Gear Lever must be in the 11 DOWN 11 position AND one throttle for
each wing must be advanced beyond the 54 degree position.
Suppose a condition arises where we need to advance the throttle beyond
the 54 degree position with the Landing Gear Lever in the 11 DOWN 11 position.
There is a switch provided that will allow us to defeat the automatic
retract feature.
rt•s called the 11 SPOILERS AUTO RETRACT DEFEAT 11 switch.
For a look at this switch TURN to Page 57.
56
The SPOILERS AUTO RETRACT DEFEAT switch is located on the forward end of
the copilot's side console. Take a look at the picture.
SPOILER AUTO
RETRACT DEFEAT
The purpose of the SPOILERS AUTO RETRACT DEFEAT switch is to prevent
the Spoilers from retracting when one throttle for each wing is advanced
beyond the 54 degree throttle position with the Landing Gear Lever in
A. any position
B. the "DOWN" position
57
B. the DOWN position
11
11
In the DOWN position. That's correct. The purpose of the SPOILERS
11
11
AUTO RETRACT DEFEAT switch is to prevent the Spoi 1ers from retracting \'then
one throttle for each wing is advanced beyond the 54 degree throttle position
with the Landing Gear lever in the 00HN position.
11
58
11
The last unit we will discuss in this book is the UNDER SPLR SPEED
(UNDER SPOILER SPEED) light located on the Annunciator Panel-left Side.
The UNDER SPLR SPEED light WARNS the pilot if Spoiler operation is
attempted at an airspeed and aircraft attitude bordering on STALL conditions.
ANNUNCIATOR PANEL-LEFT SIDE
The UNDER SPLR SPEED light will illuminate and an Audible Warning Horn
will sound when the following conditions exist.
2. The Spoiler
1. The Spoiler Select
Switch is positioned
to FLT.
s.
Lever is
LIFTED.
The aircraft approaches a stall attitude.
Do you think the UNDER SPLR SPEED light will illuminate and the Audible
Warning Horn sound if the above conditions were met and the Spoilers are
alreadY set to the FLT LIMIT position?
A. YES
B. NO
59
A. YES
Excellent! When the Spoilers are already open and a stall is approached,
the UNDER SPLR SPEED light will illuminate and the Audible Warning Horn will
sound if the Spoiler Select Switch is positioned to FLT. This notifies the
pilot to close the Spoilers.
Thus, we have three (3) conditions under which we should NOT open the
Spoilers in flight.
1. Any time the wing flaps are NOT full up.
2. Above 350 KCAS or Mach 0.75.
3. When approaching a stall.
li,
I~
60
Fill in th e blank spaces or circle the correct word(s) below .
1.
The Asymmetry Protection System detects uneven (inboa rd ) (outboard )
Spoiler operation during the first
2~
inches of Spoiler (operation)
(closing) .
2.
If only one SPOILER INOP li ght illuminates, the spoiler system will
remain operational.
a.
True
b.
False
3. The Asymmetry Protection S.vstem will NOT detect an asyrrmetric condition
on the (i nboard ) (outboard) Spoiler sections.
4. The EREO Switch is used to bypass Normal Control System , close the
Spoi 1ers and deactivate the system in the event of a - - - - - -- - during Spoil er operation .
5.
Li st the three positions of the EREO St,.!itch .
61
EMERGENCY RETRACT OPERATION
6.
EMER RETRACT , a momentary position that is spring l oaded back to
NORMAL, simulates an asymmetrical condition \>lhich , in t urn, causes:
a.
Hydraulic Systems Nr 2 and Nr 3 to drive the Spoilers (closed)
(open).
b.
7.
Nr 2 and Nr 3 SPOILER INOP 1i ghts to
t~oving
-~~=:-:--~~~--=-::-:--::--
the Spoiler Lever to RESET will (illuminate)( extinquish) thP
SPOILER INOP
li~hts
and RESET the system for operation.
EMERGENCY OFF OPERATION
8. With the EREO Switch in EMER OFF , the Spoilers cannot be (opened)
(closed) .
9.
If the Spoilers are already open , placing the EREO ·Switch to EMER
OFF will cause :
a.
Hydraulic pressure Nr 2 to be shut off at the Spoiler (Lever)
(Act uating ) Mechani sms .
applying pressure to the Spoiler Actuating Mechanisms .
c.
Hydraulic Syst em Nr 3 (pressure ) (pumps) to be shut off at the
Spoi l er Actuating Mechan i sm as soon as the Spoilers reach the
closed position.
d.
10 .
Nr 2 and Nr 3 SPOILER INOP lights to (go out) (illumi nate) .
The Spoiler Lever must be moved to CLOSED before the Hydra ul ic System
Nr 3 {pressure) (pumps ) can be shut off .
62

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