General Visual Inspection of 90, 108, 109 VU in the Forward Avionic Compartment (EWIS)

TASK 24-92-00-210-028-A
General Visual Inspection of 90, 108, 109 VU in the Forward Avionic Compartment (EWIS)

ZONE: 121
ZONE: 122

1. Reason for the Job
Refer to the MPD TASK: 200121-03
GENERAL VISUAL INSPECTION OF 90, 108, 109 VU IN THE FORWARD AVIONIC COMPARTMENT (EWIS)

NOTE: This is an EWIS (Electrical Wiring Interconnection System) procedure. EWIS is defined in ESPM 20-33-11.

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	FLASHLIGHT
No specific	AR	MIRROR - INSPECTION, FLEXIBLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
122	AVIONICS COMPARTMENT
121AL, 811, 812, 822

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 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
ESPM 2052110
90VU, 108VU and 109VU Location

3. Job Set-up
Subtask 24-92-00-010-090-A

A. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the applicable access door.
(2) Open these access doors:

121AL
811, 812 and 822 (Ref. AMM TASK 52-41-00-010-002).

Subtask 24-92-00-862-078-A

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

4. Procedure
Subtask 24-92-00-210-078-A

A. General Visual Inspection of 90VU, 108VU and 109VU in the Forward Avionic Compartment
(1) Do a visual inspection of the wiring to make sure that there is no signs of ageing, alteration, overheating, scaling and deformation ESPM 2052110:
(a) On the AC/DC feeder routes: 4G, 5G and 6G.
(b) On the AC/DC power-distribution routes: 1P, 2P and 6P.
(c) On the flight control wiring.
(d) On the engine control routes: 1S and 2S.
(e) On the other routes: 1M and 2M.
(f) On the audio route: 1R.
(g) On the coaxial cable routes: 4T, 3U and 4U.
(h) On the generator excitation routes: 1E, 2E and 3E.

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

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

5. Close-up
Subtask 24-92-00-410-088-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close these access doors:

121AL
811, 812 and 822 (Ref. AMM TASK 52-41-00-410-002).

(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:26:07 UTC