Visual Inspection of the Power Plant Wire Harnesses [CFMI]

TASK 71-50-00-210-040-A
Visual Inspection of the Power Plant Wire Harnesses

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-51-44-000-001-A	Removal of the Generator Power Harness 238W0903
TASK 71-51-44-000-002-A	Removal of the Thrust Reverser Harness 238W0908
TASK 71-51-44-000-003-A	Removal of the Integrated Drive Generator (IDG) Control and Anti-ice Harness 238W0904
TASK 71-51-44-000-004-A	Removal of the Electronic Control Unit (ECU) Channel A Harness 238W0904
TASK 71-51-44-000-005-A	Removal of the Electronic Control Unit (ECU) Channel B Harness 238W0904
TASK 71-51-44-000-006-A	Removal of the Vibration Sensor Harness 238D0912
TASK 71-51-44-000-007-A	Removal of the Left Side Harness 238W0904
TASK 71-51-44-400-001-A	Installation of the Generator Power Harness 238W0903
TASK 71-51-44-400-002-A	Installation of the Thrust Reverser Harness 238W0908
TASK 71-51-44-400-003-A	Installation of the Integrated Drive Generator (IDG) Control and Anti-ice Harness 238W0904
TASK 71-51-44-400-004-A	Installation of the Electronic Control Unit (ECU) Channel A Harness 238W0904
TASK 71-51-44-400-005-A	Installation of the Electronic Control Unit (ECU) Channel B Harness 238W0904
TASK 71-51-44-400-006-A	Installation of the Vibration Sensor Harness 238D0912
TASK 71-51-44-400-007-A	Installation of the Left Side Harness 238W0904
TASK 71-52-43-000-001-A	Removal of the Core Fire Detector Channel A Wire Harness
TASK 71-52-43-000-002-A	Removal of the Core Fire Detector Channel B Wire Harness
TASK 71-52-43-400-001-A	Installation of the Core Fire Detector Channel A Wire Harness
TASK 71-52-43-400-002-A	Installation of the Core Fire Detector Channel B Wire Harness
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
CMM 715000
AIPC 71-51-00-
TASK 70-71-13-00	BACKSHELL LOCKWIRE PROCEDURE - DESCRIPTION AND OPERATION
TASK 70-71-17-00	POWER PLANT WIRE SPLICE REPAIR PROCEDURE - DESCRIPTION AND OPERATION
TASK 70-71-20-00	HARNESS OUTER JACKET REPAIR - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 71-50-00-941-056-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 71-50-00-010-065-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 71-50-00-040-056-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 71-50-00-010-062-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 71-50-00-210-052-C ** ON A/C NOT FOR ALL

A. Do a visual inspection of the engine harnesses. Examine all parts and surfaces that can be seen with the harnesses installed on the engine.

NOTE: For ECU Control Harnesses (Refer to 73-21-50).

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the harness connectors, look for:
A.Cracks	None permitted	If the connector has a crack replace it CMM 715000.
B.Damaged Threads	None permitted	If the connector is damaged replace it CMM 715000.
C.Connection	Must be fully engaged	Tighten the connector with your hand.
2.Examine the connector backshell, look for:
A.Cracks	None permitted	If cracks are found replace the backshell CMM 715000.
B.Damage	None permitted	If damage is found replace the backshell CMM 715000.
C.Connection	Must be fully engaged	Tighten the backshell as required.
D.Missing lockwire or safety cable	None permitted	Replace the lockwire or safety cable (Ref. AMM D/O 70-71-13-00).
3.Examine the connector adapter, look for:
A.Cracks	None permitted	If cracks are found replace the adapter CMM 715000.
B.Damage	None permitted	If damage is found replace the adapter, CMM 715000.
C.Connection	Must be fully engaged	Tighten the adapter, as required.
D.Missing lockwire or safety cable	None permitted	Replace lockwire or safety cable (Ref. AMM D/O 70-71-13-00).
4.Examine the harness DR-25/16 or M23053/13 Viton outer jacket, look for:
A.Crack	None permitted	If cracks are found repair the outer jacket (Ref. AMM D/O 70-71-20-00).
B.Cuts	0.5 in. (12.70 mm) maximum length, 0.12 in. (3.05 mm) maximum width	If the cut is less than the permitted limits and it is not possible to remove the damaged wire harness, do temporary repair (Ref. AMM D/O 70-71-20-00). If cut is more than the allowable limits replace outer jacket CMM 715000.
5.Examine the connector boots, look for:
A.Cracks	None permitted	If cracks are found replace the connector boot CMM 715000.
B.Missing sealant	None permitted	Add sealant where missing CMM 715000.
6.Examine the transition fittings, look for:
A.Cracks	None permitted	If cracks are found replace the transition fitting CMM 715000.
B.Missing sealant	None permitted	Add sealant where missing CMM 715000.
7.Examine the harness clamps and their attaching parts, look for:
A.Corrosion	None permitted	Replace clamps or hardware that is corroded AIPC 71-51-00-.
B.Damage	None permitted	Replace clamps or hardware that is damaged AIPC 71-51-00-.
C.Missing Parts	None permitted	Replace clamps or hardware that is missing AIPC 71-51-00-.
D.Loose fasteners	None permitted	Tighten all loose fasteners. Refer to each specific harness installation in ATA 715143.
8.Examine the harness wires if they are visible, look for :
A.Cracks, cuts and nicks	None permitted	Replace the harness (Ref. AMM TASK 71-52-43-000-001) and (Ref. AMM TASK 71-52-43-400-001) or (Ref. AMM TASK 71-52-43-000-002) and (Ref. AMM TASK 71-52-43-400-002) or (Ref. AMM TASK 71-51-44-000-001) and (Ref. AMM TASK 71-51-44-400-001) or (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002) or (Ref. AMM TASK 71-51-44-000-003) and (Ref. AMM TASK 71-51-44-400-003) or (Ref. AMM TASK 71-51-44-000-003) and (Ref. AMM TASK 71-51-44-400-003) or (Ref. AMM TASK 71-51-44-000-004) and (Ref. AMM TASK 71-51-44-400-004) or (Ref. AMM TASK 71-51-44-000-005) and (Ref. AMM TASK 71-51-44-400-005) or (Ref. AMM TASK 71-51-44-000-006) and (Ref. AMM TASK 71-51-44-400-006) or (Ref. AMM TASK 71-51-44-000-007) and (Ref. AMM TASK 71-51-44-400-007)
B.Splice	For Splice Repair Limits see (Ref. AMM D/O 70-71-17-00), paragraph 5.	If it is not possible to remove the damaged harness from the aircraft, and the damaged harness is within the splice repair limits, do temporary repair (Ref. AMM D/O 70-71-17-00). If the damaged harness is more than the splice repair limits, replace the harness (Ref. AMM TASK 71-51-44-000-001) and (Ref. AMM TASK 71-51-44-400-001).
9.Examine the harness ground terminal lugs, look for:
A.Damage	None permitted	Replace the harness (Ref. AMM TASK 71-51-44-000-003) and (Ref. AMM TASK 71-51-44-400-003) or (Ref. AMM TASK 71-51-44-000-007) and (Ref. AMM TASK 71-51-44-400-007).
B.Splice	For splice repair limits see (Ref. AMM D/O 70-71-17-00)	If it is not possible to remove the damaged harness from the aircraft and the damaged harness is within the splice repair limits, do temporary repair (Ref. AMM D/O 70-71-17-00). If damaged harness is more than the splice repair limits, replace the harness (Ref. AMM TASK 71-51-44-000-003) and (Ref. AMM TASK 71-51-44-400-003) or (Ref. AMM TASK 71-51-44-000-007) and (Ref. AMM TASK 71-51-44-400-007).

5. Close-up
Subtask 71-50-00-410-065-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 71-50-00-440-056-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 71-50-00-410-062-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:23:07 UTC