standard practices: wiring - Cirrus Design Authorized Service Center

standard practices: wiring - Cirrus Design Authorized Service Center
CIRRUS
AIRCRAFT WIRING MANUAL
MODELS SR22 AND SR22T
STANDARD PRACTICES: WIRING
1. GENERAL
This chapter contains requirements and procedures for the fabrication, repair, and marking of wire harness
assemblies, cables, and wires. All wiring repairs and marking of wire harness assemblies, cables, and
wires should be accomplished in accordance with the procedures in this chapter and in accordance with
FAA Advisory Circular AC 43-13 (latest revision).
A. Terminology
The following terms are used throughout this chapter. The maintenance technician should be familiar
with the following definitions, materials, and procedures:
•
Wire: An individual insulated wire. Either stranded or solid.
•
Cable: A multi-conductor cable. In most cases this is a shielded twisted-wire cable that is jacketed
with a Teflon material.
•
Wire: Bundle A group of wires and/or cables that are tied together using tie string, tie wraps, or
other methods. In some cases the wire bundle may be covered with an external sheath.
•
Wire Harness: A complete assembly including a wire bundle and the associated connectors, fasteners, and markings.
•
Plug: A connector with female pins (sockets) normally used on the power side (coming from an
electrical source) of a connection of two or more bundles or devices.
•
Jack: A connector with male pins normally used on the device side of a connection.
B. Wire and Cable Marking
Wire marking aids the technician in locating and identifying individual wires within a wire bundle. Wire
marking consists of a combination of letters and numbers that identify the wire, circuit or system, wire
gauge, and additional data that helps in wire identification.
(1)
(2)
Numbering
(a) Wires are numbered to identify the system, circuit, wire number, wire gauge, and signal
type. For example, wire ANGP003-20N indicates a 20 AWG ground wire for the GPS
receiver.
(b) Each wire is numbered within 6 inches of the termination at each end and every 12 to 15
inches along the length of the wire with the following exceptions:
1
Wires less than 6 inches in length may not be marked.
2
Wires installed within conduit are marked within 6 inches of termination ends.
3
Wires 6 to 24 inches in length and having one end terminated by a terminal ring,
spade lug, or soldered to a device are marked by a single marker on the external
connector end.
4
Assemblies consisting of a single wire with terminal rings or spade lugs on each end
and not having a wire number are not marked but are labeled with the part's assembly number and revision level.
5
Wires 6 to 24 inches in length, not meeting the above criteria, are marked within 6
inches of each termination end.
Marking
(a) Wires are marked by stamping directly onto the wire insulation, or are marked by attaching
printed sleeving or tape.
(b) Each wire and/or cable is marked by using the codes listed in Figure 20-001.
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AIRCRAFT WIRING MANUAL
MODELS SR22 AND SR22T
C. Wire Harness Marking
Wire harnesses are also marked for ease of identification during fabrication and installation. Wire harnesses are marked using the following methods:
(1)
Markings
Each wire harness shall be marked with a unique number that identifies its location in the airplane. Wire harness numbers shall start with a “W” followed by a unique three (3) digit number
that corresponds to the wire harness location. The following numbering convention is used:
(a) 001-299 Firewall Forward
(b) 300-399 Left Wing
(c)
400-499 Right Wing
(d) 500-999 Fuselage
Wire harnesses are marked with a tag that identifies the wire harness number and the wire harness part number. This tag is attached to the wire harness adjacent to the plug or jack that provides primary power or signals to the wire harness.
D. Plug and Jack Marking
Plugs and jacks are marked to aid in identification during fabrication, installation, and troubleshooting.
Plugs and jacks are be marked using the following methods:
(1)
Markings
Plugs and jacks are marked with a unique number that identifies their location in the airplane.
The first character is a “P” for plugs or a “J” for jacks. The plug or jack designation is followed by
a unique three (3) digit number that corresponds to the plug/jack location. The following numbering convention is used:
(a) 001-299 Firewall Forward
(b) 300-399 Left Wing
(c)
400-499 Right Wing
(d) 500-999 Fuselage
Plugs and jacks are marked with a tag that identifies the plug or jack number. This tag is
attached to the wire harness adjacent to the plug or jack.
Relay bases or sockets do not require marking. Bases are directly marked with paint or visible
permanent marker with the base identification number.
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AIRCRAFT WIRING MANUAL
MODELS SR22 AND SR22T
XXXX0000 - XX (X)
SYSTEM FUNCTION
SIGNAL TYPE
N = Ground
CIRCUIT GENERAL
CIRCUIT SPECIFIC
SYSTEM / CODE
WIRE NUMBER
WIRE GAUGE
000 - 299, 5000 - 5999 Firewall Forward
300 - 399, 3000 - 3999 Left Wing
400 - 499, 4000 - 4999 Right Wing
500 - 999, 1000 - 2999 Fuselage
CIRCUIT, GENERAL
CIRCUIT, SPECIFIC
Power (P)
BAPR
Generation
Battery 2
PAC
Power
Air Conditioning
PACC
Power
Autopilot
PACF
Ground
PFD Cooling Fan
PADL
Power
ADL
PAPS
Power
Pitch Servo
PARS
Power
Roll Servo
PAYS
Power
Yaw Servo
PBLU
Ground
Air Conditioning
PCAU
Power
Audio Panel
PCP
Power
Convenience Power
PCPR
Power
Convenience Power
PDM
Power
DME
PEP
Entertainment Power
PFD
Navigation
Display
PG
Shield Ground
Flaps
PGAL
Generation
Alternator
PGCB
Generation
Circuit Breaker
PGCF
Power
Avionics Cooling Fan
PGEA
Power
GEA
PGLV
Generation
Low Voltage
Figure 20-001
Wire Number Codes (Sheet 1 of 4)
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SYSTEM / CODE
MODELS SR22 AND SR22T
CIRCUIT, GENERAL
CIRCUIT, SPECIFIC
PGMS
Generation
Master Switch
PGST
Generation
Starter
PMCF
Power
MFD Cooling Fan
PNAD
Power
ADF
PNDM
Power
DME
PPCF
Power
PFD Cooling Fan
PRDM
Power
ADL
PXF
Power
Transponder Cooling Fan
PXM
Power
XM Weather
AACC
Autopilot
Controller/Computer
AAGP
Autopilot
GPS
AAPT
Autopilot
Pitch Trim
AART
Autopilot
Roll Trim
ACAU
Communications
Audio
ACEA
Data
GEA
ACEL
Shield Ground
ELT
ACFD
Switch
TO/GA Switch
ACMD
MFD
Display
ACMS
Switch
Avionics Switch
ACPD
Data
PFD
ACSB
Data
GEA
ACTL
Communications
Telephone
ACTX
Communications
Transponder
ACVH
Communications
VHF Radio
AEVS
Data
EVS
ANAD
Navigation
ADF
ANAU
Navigation
Audio
ANDM
Navigation
DME
ANEG
Navigation
TAWS
Avionics (A)
Figure 20-001
Wire Number Codes (Sheet 2 of 4)
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AIRCRAFT WIRING MANUAL
SYSTEM / CODE
MODELS SR22 AND SR22T
CIRCUIT, GENERAL
CIRCUIT, SPECIFIC
ANFM
Power
Keypad
ANGP
Navigation
GPS
ANHS
Navigation
HSI
ANMD
Navigation
Display
ANRS
Data
AHRS, Air Data
ANSK
Data
Skywatch
ANSS
Data
Stormscope
ANTA
Power
Skywatch
ANVH
Navigation
VHF Radio
ANXM
Data
XM Weather
ANEN
Power
Engine Instruments
IEFL
Engine Indicator
Fuel Level
IEHB
Engine Indicator
Hobbs
IEOP
Engine Indicator
Oil Pressure
IEOT
Engine Indicator
Oil Temperature
INFD
Navigation
Flux Detector
INHS
Navigation
HSI
IPAT
Power
Attitude 2
IPCL
Power
Clock
IPEI
Power
Engine Instruments
IPHS
Power
HSI
IPTC
Power
Turn Coordinator
IPVA
Power
Volt/Amp
IPYT
Power
Yaw Trim
ISAN
System Indicator
Annunciator
ISOA
System Indicator
OAT
EEFP
Electric
Fuel Pump
EFGS
Switch
Gascolator
Instruments (I)
Engine (E)
Figure 20-001
Wire Number Codes (Sheet 3 of 4)
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AIRCRAFT WIRING MANUAL
SYSTEM / CODE
EPMA
MODELS SR22 AND SR22T
CIRCUIT, GENERAL
CIRCUIT, SPECIFIC
Power
Magnetos
LELD
Exterior
Landing
LENV
Exterior
Navigation
LEST
Exterior
Strobe
LIBG
Interior
Baggage
LICB
Power
Attitude 2
LIFL
Interior
Flood
LIIL
Interior
Instrument Lights
LILS
Ground
Dimmer Switch
CAC
Control
Air Conditioning
CASD
Switch
Autopilot Disconnect
CFL
Flaps
CPT
Pitch Trim
CRT
Roll Trim
CSAC
Power
Air Conditioning
CSAV
Switch
Avionics Switch
CSIC
Power
Ice Protection
CSMS
Switch
Master Switch
CSST
Switch
Starter Switch
CSTM
Switch
Trim Switch
CSVA
Switch
Vacuum
CSYT
Switch
Yaw Trim
SSW
Switch
Stall Warning
Lights (L)
Controls (C)
Figure 20-001
Wire Number Codes (Sheet 4 of 4)
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AIRCRAFT WIRING MANUAL
MODELS SR22 AND SR22T
2. FAULT ISOLATION
Malfunction symptoms will normally be a result of operational checkout or functional test procedures that
fail at some point. Discrepancies must be resolved before the procedures can be completed. Another
source of malfunction symptoms are the crew member squawks.
WARNING:
Use extreme caution when performing maintenance operations on the airplane.
Unless otherwise instructed, troubleshooting will be performed with the system deenergized.
If a circuit is being tested with a lampload or a Meggar which may result in arcing,
safety procedures relating to fuel vapors must be observed.
Do not wear rings, wrist watches, metal bracelets, or other jewelry which can cause a
short circuit resulting in serious injury.
Repairing or troubleshooting of wiring must be accomplished by referring to the electrical wiring diagrams
contained in this manual.
After the malfunction is cleared, perform appropriate operational checkout or functional test procedure.
In light circuits with only one lamp, the isolation procedure usually starts with the possibility of a defective
lamp. In a light circuit that has two or more lamps, the isolation procedures do not isolate defective lamps.
A fault that results from shorted light circuits is often caused by foreign metal objects that have fallen into
the wiring or by pinched wires resulting from maintenance work on other equipment in the area. A thorough
visual inspection may often locate a fault in shorted light circuits.
A. Test Leads
When using test leads to make voltage checks, the following procedures shall be followed:
(1)
Inspection/Test
(a) Remove system power.
(b) Disconnect applicable connector.
(c)
Install test lead between designated connector or receptacle pins which complete circuit to
be tested.
(d) Apply system power and perform check.
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MODELS SR22 AND SR22T
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