General Visual Inspection of EWIS Installed in the Upper Forward Pylon (EWIS)

TASK 24-92-00-210-818-A
General Visual Inspection of EWIS Installed in the Upper Forward Pylon (EWIS)

ZONE: 413
ZONE: 414
ZONE: 423
ZONE: 424

1. Reason for the Job
Refer to the MPD TASK: 200413-04
GENERAL VISUAL INSPECTION OF EWIS INSTALLED IN THE UPPER FORWARD PYLON (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 4M (13 FT)-ADJUSTABLE
No specific	AR	FLASHLIGHT
No specific	AR	MIRROR - INSPECTION, FLEXIBLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
413	UPPER FWD PYLON
414	UPPER FWD PYLON
423	UPPER FWD PYLON
424	UPPER FWD PYLON
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AT, 414AR, 414BR, 414CR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AT, 424AR, 424BR, 424CR, 424DR

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 54-52-11-000-805-A	Removal of the Access Skin Panels
TASK 54-52-11-400-805-A	Installation of the Access Skin Panels
ESPM 2052120
Upper Forward Pylon - Inspection Area - Zones 413-414-423-424

3. Job Set-up
Subtask 24-92-00-941-072-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 24-92-00-862-160-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 24-92-00-010-184-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the upper forward pylon.
(2) Remove the access skin panels (Ref. AMM TASK 54-52-11-000-805):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AT 414AR 414BR 414CR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AT 424AR 424BR 424CR 424DR.

4. Procedure
Subtask 24-92-00-210-123-A ** ON A/C NOT FOR ALL

A. General Visual Inspection of all Wiring Installed in the Upper Forward Pylon
(1) Do a visual inspection of the wiring to make sure that there is no signs of ageing, alteration, overheating, scaling and deformation ESPM 2052120:
(a) On the AC/DC feeder routes 1G and 2G.
(b) On the engine control routes 1S and 2S.
(c) On the routes 1M and 2M.
(d) On the generator excitation routes: 1E and 2E.

NOTE: Use a FLASHLIGHT or a MIRROR - INSPECTION, FLEXIBLE, if necessary.

(2) Make sure that there is no hydraulic, dust or fuel contamination.

5. Close-up
Subtask 24-92-00-410-192-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) Install the access skin panels (Ref. AMM TASK 54-52-11-400-805):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AT 414AR 414BR 414CR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AT 424AR 424BR 424CR 424DR.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:26:46 UTC