Cleaning of EWIS Installed in the Aft Passenger Overhead-Compartment (Only If Contaminated)(EWIS)

TASK 24-92-00-100-021-A
Cleaning of EWIS Installed in the Aft Passenger Overhead-Compartment (Only If Contaminated)(EWIS)

ZONE: 253
ZONE: 254

1. Reason for the Job
Refer to the MPD TASK: 200253-01
CLEANING OF EWIS INSTALLED IN THE AFT PASSENGER OVERHEAD 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 4M (13 FT)-ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
253	AFT PASSENGER COMPARTMENT OVERHEAD COMPT
254	AFT PASSENGER COMPARTMENT OVERHEAD COMPT
251CC, 251DC, 251EC, 251FC, 251GC, 251HC, 251JC
251KC, 251LC, 251MC
251AC, 251BC

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 25-23-41-000-001-A	Removal of the Ceiling Panels
TASK 25-23-41-400-001-A	Installation of the Ceiling Panels
TASK 25-24-41-000-001-A	Removal of the Overhead Stowage Compartments (OHSC)
TASK 25-24-41-400-001-A	Installation of the Overhead Stowage Compartments (OHSC)
TASK 25-42-41-000-001-A	Removal of Lavatory H
TASK 25-42-41-400-001-A	Installation of Lavatory H
TASK 52-10-00-010-001-A	Opening of the Passenger/Crew Door
TASK 52-10-00-410-001-A	Closing of the Passenger/Crew Door
ESPM 2055000
Aft Passenger Overhead-Compartment - Cleaning Area - Zones 253-254
Aft Passenger Overhead-Compartment - Access Panels - Zones 253-254 ** ON A/C NOT FOR ALL
Aft Passenger Overhead-Compartment - Access Panels - Zones 253-254 ** ON A/C NOT FOR ALL
Aft Passenger Overhead-Compartment - Access Panels - Zones 253-254 ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 24-92-00-010-125-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the zone 832 (842).
(2) Open the passenger/crew door 832 (842) (Ref. AMM TASK 52-10-00-010-001).
(3) Remove the furnishings in the zones 251 and 252:
(a) Remove the lavatories, if installed (Ref. AMM D/O 25-42-41-00).
(4) Remove the overhead stowage compartments between FR47 and FR64 (Ref. AMM TASK 25-24-41-000-001).
(5) Remove the ceiling panels in the zones 253 and 254 (Ref. AMM TASK 25-23-41-000-001):

251AC 251BC 251CC 251DC 251EC 251FC 251GC 251HC 251JC.

Subtask 24-92-00-010-125-B ** ON A/C NOT FOR ALL

A. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the zone 832 (842).
(2) Open the passenger/crew door 832 (842) (Ref. AMM TASK 52-10-00-010-001).
(3) Remove the furnishings in the zones 251 and 252:
(a) Remove the lavatories, if installed (Ref. AMM TASK 25-42-41-000-001).
(4) Remove the overhead stowage compartments between FR47 and FR64 (Ref. AMM TASK 25-24-41-000-001).
(5) Remove the ceiling panels in the zones 253 and 254 (Ref. AMM TASK 25-23-41-000-001):

251AC 251KC 251LC 251MC 251BC 251CC 251DC 251EC 251FC 251GC 251HC 251JC.

Subtask 24-92-00-010-125-C ** ON A/C NOT FOR ALL

251CC 251DC 251EC 251FC 251GC 251HC 251JC.

Subtask 24-92-00-862-113-A

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

4. Procedure
Subtask 24-92-00-160-069-A

A. Cleaning of All Wiring Installed in the Aft Passenger Overhead-Compartment (Only Contaminated Wiring)
(1) Clean the wiring if there is dust contamination ESPM 2055000.
(a) On the AC/DC feeder routes: 3G and 6G.
(b) On the AC/DC power-distribution routes: 1P, 2P and 3P.
(c) On the engine control route: 1S.
(d) On other routes: 1M, 2M and 3M.
(e) On the excitation wiring routes: 6E and 3E.
(f) On the audio or video route: 1R.

5. Close-up
Subtask 24-92-00-410-123-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 ceiling panels in the zones 253 and 254 (Ref. AMM TASK 25-23-41-400-001):

251AC 251BC 251CC 251DC 251EC 251FC 251GC 251HC 251JC.

(3) Install the overhead stowage compartments between FR47 and FR64 (Ref. AMM TASK 25-24-41-400-001).
(4) Install the furnishings in the zones 251 and 252:
(a) Install the lavatories, if removed (Ref. AMM D/O 25-42-41-40).
(5) Close the passenger/crew door 832 (842) (Ref. AMM TASK 52-10-00-410-001).
(6) Remove the access platform(s).

Subtask 24-92-00-410-123-B ** 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 ceiling panels in the zones 253 and 254 (Ref. AMM TASK 25-23-41-400-001):

251AC 251KC 251LC 251MC 251BC 251CC 251DC 251EC 251FC, 251GC 251HC 251JC.

(3) Install the overhead stowage compartments between FR47 and FR64 (Ref. AMM TASK 25-24-41-400-001).
(4) Install the furnishings in the zones 251 and 252:
(a) Install the lavatories, if removed (Ref. AMM TASK 25-42-41-400-001).
(5) Close the passenger/crew door 832 (842) (Ref. AMM TASK 52-10-00-410-001).
(6) Remove the access platform(s).

Subtask 24-92-00-410-123-C ** 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 ceiling panels in the zones 253 and 254 (Ref. AMM TASK 25-23-41-400-001):

251CC 251DC 251EC 251FC 251GC 251HC 251JC.

[Rev.10 from 2021] 2026.03.31 23:27:18 UTC