Boeing Next Generation 737 Automatic Flight System User manual

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08 AUTOMATIC FLIGHT

V I R T U A L

Topics

N E X T G E N E R A T I O N

V I R T U A L

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

AFS Automatic Flight System

– AFDS Autopilot Flight Director System

– Mode Control Panel

• Speed

• Vertical navigation

• Lateral navigation

• Autopilot/Flight Director

– Autopilot engagement/disengagement

– AFS failure

– Flight Director

– AFDS Status Annunciation, Flight Mode Annunciation

– Control Wheel Steering

– Autothrottle System

Automatic Flight Operations

– Takeoff and Climb

– Enroute

– Approach and Landing

– Go-around

– Operation in windshear

V I R T U A L

AFDS

MCP

BOEING 737 NEXT GENERATION

FLIGHT INSTRUMENTS, DISPLAYS

 Speed

 Vertical navigation

 Lateral navigation

 Autopilot & F/D

BOEING 737 NEXT GENERATION

V I R T U A L

Course overview

– Airplane General

– Air Systems

– Warning Systems, Communications,

Ice & Rain Protection

– Electrical

– Engines, APU, Fuel System

– Hydraulics, Flight Controls,

Landing Gear, Brakes

– Flight Instruments, Displays

– Automatic Flight

– Flight Management, Navigation

– Normal Operations

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BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

AFS

Overview

The automatic flight system (AFS) consists of the autopilot flight director system (AFDS) and the autothrottle

(A/T). The flight management computer (FMC) provides N1 limits and target N1 for the A/T and command airspeeds for the A/T and AFDS.

The AFDS and A/T are controlled using the AFDS mode control panel (MCP) and the FMC. Normally, the

AFDS and A/T are controlled automatically by the FMC to fly an optimized lateral and vertical flight path through climb, cruise and descent.

Indicators

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BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

AFDS

MCP Speed

• Autothrottle ARM switch

• Autothrottle indicator light

• Changeover switch

• MCP speed condition symbols

• IAS/MACH display

• N1 switch

• SPEED switch

• IAS/MACH selector

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AUTOMATIC FLIGHT

AFDS

MCP Vertical navigation

• VNAV switch

• Altitude display

• Vertical speed display

• Vertical speed thumbwheel

• Level Change switch

• Approach switch

• Altitude selector

• Altitude hold switch

• Vertical speed switch

V I R T U A L

AFDS

MCP Lateral navigation

• Course display

• Heading selector

• Heading display

• LNAV switch

• VOR Localizer switch

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

• Course selector

• Bank angle selector

• Heading select switch

• Approach switch

V I R T U A L

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

AFDS

MCP A/P, F/D

• Command engage switches

• CWS engage switches

• Autopilot disengage bar

• Master F/D indication

• Flight director switch

V I R T U A L

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

AFDS

AFS failures

– Power interruption or loss may cause disengagement of the AFDS and/or A/T. Re–engagement is possible after power is restored.

– Dual channel A/P operation is possible only when two generators are powering the busses.

– Two independent radio altimeters provide radio altitude to the respective FCCs. With a radio altimeter inoperative, do not use the associated FCC for approach or landing, and do not use the associated autopilot for approach.

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AUTOMATIC FLIGHT

AFDS

Autopilot engagement/disengagement

Each A/P can be engaged by pushing a separate CMD or CWS engage switch. A/P engagement in CMD or

CWS is inhibited unless both of the following pilot–controlled conditions are met:

• no force is being applied to the control wheel

• the STAB TRIM AUTOPILOT cutout switch is at NORMAL.

Only one A/P can be engaged at a given time unless the approach (APP) mode is engaged. Approach mode allows both A/Ps to be engaged at the same time. Dual A/P operation provides control through landing flare and touchdown or an automatic go–around.

The A/P automatically disengages when any of the following occurs:

• pushing either A/P disengage switch

• pushing either TO/GA switch with a single A/P engaged in CWS or CMD below 2000 feet RA

• pushing either TO/GA switch with a single A/P above 2000 feet RA with flaps down or G/S engaged.

• pushing either TO/GA switch after touchdown with both A/Ps engaged in CMD

• pushing an illuminated A/P ENGAGE switch

• pushing the A/P DISENGAGE bar down

• activating either pilot’s control wheel trim switch

• moving the STAB TRIM AUTOPILOT cutout switch to CUTOUT

• either left or right IRS system failure or FAULT light illuminated

• loss of electrical power or a sensor input which prevents proper operation of the engaged A/P and mode

• loss of respective hydraulic system pressure.

V I R T U A L

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

AFDS

Flight Director

Turning a F/D switch ON displays command bars on the respective pilot’s attitude indicator if command pitch and roll modes are engaged. If command pitch and roll modes are not engaged, the F/D command bars do not appear. The F/Ds can be operated with or without the A/P and A/T. F/D command modes can be used with an A/P engaged in CWS.

F/D commands operate in the same command modes as the A/P except:

• the takeoff mode is a F/D only mode

• dual F/D guidance is available for single engine operation

• the F/D has no landing flare capability. F/D command bars retract from view at approximately 50 feet RA on an ILS approach.

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AFDS

Status Annunciation

FMA

CWS

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

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BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

Automatic Flight Operations

Takeoff

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AUTOMATIC FLIGHT

Autothrottle

The A/T system provides automatic thrust control from the start of takeoff through climb, cruise, descent, approach and go–around or landing. In normal operation, the FMC provides the A/T system with N1 limit values.

The A/T moves the thrust levers with a separate servo motor on each thrust lever. Manually positioning the thrust levers does not cause A/T disengagement unless 10 degrees of thrust lever separation is exceeded during a dual channel approach after FLARE armed is annunciated. Following manual positioning, the A/T may reposition the thrust levers to comply with computed thrust requirements except while in the THR HLD and ARM modes.

The A/T system operates properly with the EECs ON or in ALTN. In either case, the A/T uses the FMC N1 limits.

Thrust mode display annunciations

• TO – takeoff

• R-TO – reduced takeoff

• R-CLB – reduced climb

• CLB – climb

• CRZ – cruise

• G/A – go–around

• CON – continuous

• ––– – FMC not computing thrust limit

V I R T U A L

BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

Automatic Flight Operations

Approach and Landing

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BOEING 737 NEXT GENERATION

AUTOMATIC FLIGHT

Automatic Flight Operations

Go-around

BOEING 737 NEXT GENERATION

V I R T U A L

Köszönöm a figyelmet!

Elérhetõségek:

Internet: http://www.b737.virtualairlines.hu

E-mail: [email protected]

Elõadó: Hegedüs Zoltán

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