Cleaning of EWIS Installed in the Forward Avionic Compartment (Only If Contaminated)(EWIS)

TASK 24-92-00-100-004-A
Cleaning of EWIS Installed in the Forward Avionic Compartment (Only If Contaminated)(EWIS)

ZONE: 121
ZONE: 122

1. Reason for the Job
Refer to the MPD TASK: 200121-01
CLEANING OF EWIS INSTALLED IN THE FORWARD AVIONIC COMPARTMENT (ONLY IF CONTAMINATED)(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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
122	AVIONICS COMPARTMENT
121AF, 121AL, 121BF, 121CF, 122BF, 811

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
TASK 53-12-13-000-001-A	Removal of the avionics compartment floor panels
TASK 53-12-13-400-001-A	Installation of the avionics compartment floor panels
ESPM 2055000
Forward Avionic Compartment - Access
Forward Avionic Compartment - Cleaning Area - Zones 121-122

3. Job Set-up
Subtask 24-92-00-010-092-A

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

(3) Remove the forward avionic-compartment floor-panels 121AF 121BF 121CF and 122BF (Ref. AMM TASK 53-12-13-000-001).

Subtask 24-92-00-862-080-A

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

4. Procedure
Subtask 24-92-00-160-052-A

A. Cleaning of All Wiring Installed in the Forward Avionic Compartment (Only Contaminated Wiring)
(1) Clean the wiring if there is dust, lint or hydraulic contamination ESPM 2055000.
(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.

5. Close-up
Subtask 24-92-00-410-090-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the forward avionics-compartment floor-panels 121AF 121BF 121CF and 122BF (Ref. AMM TASK 53-12-13-400-001).
(3) Close the access doors:

(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:27:03 UTC