Cleaning of EWIS Installed in the Forward Cabin Overhead-Compartment (Only If Contaminated)(EWIS)

TASK 24-92-00-100-010-A
Cleaning of EWIS Installed in the Forward Cabin Overhead-Compartment (Only If Contaminated)(EWIS)

ZONE: 223
ZONE: 224

1. Reason for the Job
Refer to the MPD TASK: 200223-01
CLEANING OF EWIS INSTALLED IN THE FORWARD CABIN 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
223	FWD CAB OVERHEAD COMPARTMENT
224	FWD CAB OVERHEAD COMPARTMENT
221AC, 221BC, 222BC

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 25-23-42-000-001-A	Removal of the Ceiling Panels - Forward Utility Area
TASK 25-23-42-400-001-A	Installation of the Ceiling Panels - Forward Utility Area
TASK 25-31-41-000-001-A	Removal of the Forward Galley Unit
TASK 25-31-41-400-001-A	Installation of the Forward Galley Unit
TASK 25-31-42-000-001-A	Removal of the Forward Galley Unit
TASK 25-31-42-400-001-A	Installation of the Forward Galley Unit
TASK 25-41-41-000-001-A	Removal of Lavatory A
TASK 25-41-41-000-001-B	Removal of Lavatory A
TASK 25-41-41-400-001-A	Installation of Lavatory A
TASK 25-41-41-400-001-B	Installation of Lavatory A
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
Forward Cabin Overhead-Compartment - Cleaning Area - Zones 223-224
Forward Cabin Overhead-Compartment - Access Panels - Zones 223-224

3. Job Set-up
Subtask 24-92-00-010-103-A

A. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the zone 831 (841).
(2) Open the forward passenger/crew door 831 (841) (Ref. AMM TASK 52-10-00-010-001).
(3) Remove the ceiling panels in the forward utility area (Ref. AMM TASK 25-23-42-000-001):

221AC 221BC 222BC.

(4) Remove the lavatory A (Ref. AMM TASK 25-41-41-000-001) or stowage (Ref. AMM D/O 25-27-44-00) if installed.
(5) Remove the forward galley unit (6475MM) (Ref. AMM TASK 25-31-41-000-001) or (Ref. AMM TASK 25-31-42-000-001) if installed.

Subtask 24-92-00-862-091-A

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

4. Procedure
Subtask 24-92-00-160-059-A

A. Cleaning of All Wiring Installed in the Forward Cabin 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 generator excitation routes: 3E and 6E.
(d) On other routes: 1M and 2M.

5. Close-up
Subtask 24-92-00-410-101-A

A. Close Access
(1) Install the ceiling panels in the forward utility area (Ref. AMM TASK 25-23-42-400-001).

221AC 221BC 222BC.

(2) Install the forward galley unit (6475MM) (Ref. AMM TASK 25-31-41-400-001) or (Ref. AMM TASK 25-31-42-400-001) if removed.
(3) Install the lavatory A (Ref. AMM TASK 25-41-41-400-001) or stowage (Ref. AMM D/O 25-27-44-40) if removed.
(4) Close the forward passenger/crew door 831 (841) (Ref. AMM TASK 52-10-00-410-001).
(5) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:27:08 UTC