Detailed Inspection of EWIS Installed in the Fan Compartment (EWIS)

TASK 24-92-00-220-802-A
Detailed Inspection of EWIS Installed in the Fan Compartment (EWIS)

ZONE: 435
ZONE: 436
ZONE: 445
ZONE: 446

1. Reason for the Job
Refer to the MPD TASK: 200435-02
DETAILED INSPECTION OF EWIS INSTALLED IN THE FAN COMPARTMENT (EWIS)

NOTE: This is an EWIS (Electrical Wiring Interconnection System) procedure. For the EWIS, refer to ESPM 20-33-11.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
435	FAN AND ACCESSORY GEARBOX
436	FAN AND ACCESSORY GEARBOX
445	FAN AND ACCESSORY GEARBOX
446	FAN AND ACCESSORY GEARBOX
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
ESPM 2052120
Fan and Accessory Gear Box - Access

3. Job Set-up
Subtask 24-92-00-941-073-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 24-92-00-862-161-A ** ON A/C NOT FOR ALL

B. Make sure that the aircraft electrical circuits are de-energized
(Ref. AMM TASK 24-41-00-862-002).

Subtask 24-92-00-010-185-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 24-92-00-220-068-A ** ON A/C NOT FOR ALL

A. Detailed Inspection of all Wiring in the Fan Compartment
(1) Do a detailed inspection of the wiring to make sure that there is no signs of ageing, alteration, overheating, scaling and deformation ESPM 2052120:
(a) Use FLASHLIGHT a or a MIRROR - INSPECTION, if necessary.
(2) Make sure that there is no dust, fuel, oil or hydraulic contamination.

5. Close-up
Subtask 24-92-00-410-193-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Remove the access platform(s).
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:26:47 UTC