Cleaning of EWIS Installed in the Aft Cabin Underfloor Compartment (Only If Contaminated)(EWIS)

TASK 24-92-00-100-001-A
Cleaning of EWIS Installed in the Aft Cabin Underfloor Compartment (Only If Contaminated)(EWIS)

ZONE: 171
ZONE: 172

1. Reason for the Job
Refer to the MPD TASK: 200171-01
CLEANING OF EWIS INSTALLED IN THE AFT CABIN UNDERFLOOR 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
171	AFT CABIN U/FLOOR COMPARTMENT
172	AFT CABIN U/FLOOR COMPARTMENT
171AL, 172AR

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 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 25-55-12-400-001-A	Installation of the Aft Cargo-Compartment Partition at FR65
TASK 53-00-00-000-801-A	Removal of the Floor Panels in the Cabin from FR12 to FR70
TASK 53-00-00-000-801-A-01	Removal of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Removal Procedure - Dry Sealing Concept)
TASK 53-00-00-000-801-A-02	Removal of the Cabin Floor Panels from FR12 to FR70 (Alternative Removal Procedure with the Skyflex Option)
TASK 53-00-00-400-801-A	Installation of the Floor Panels in the Cabin from FR12 to FR70
TASK 53-00-00-400-801-A-01	Installation of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Installation Procedure - Dry Sealing Concept)
TASK 53-00-00-400-801-A-02	Installation of the Cabin Floor Panels from FR12 to FR70 (Alternative Installation Procedure with the Skyflex Option)
ESPM 2055000
TASK 06-41-53-00	FUSELAGE-DESCRIPTION AND OPERATION
Aft Cabin Underfloor Compartment - Access Panels - Zones 171-172
Aft Cabin Underfloor Compartment - Cleaning Area - Zones 171-172

3. Job Set-up
Subtask 24-92-00-010-087-A

A. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the access panels:
172AR 171AL.
(2) Open access panels:

172AR
171AL.

Subtask 24-92-00-862-075-A

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

4. Procedure
Subtask 24-92-00-410-181-A

A. Preparation for Cleaning of Contaminated Wiring
(1) Remove the AFT cargo-compartment partition FR65 (Ref. AMM TASK 25-55-12-000-001).
(2) Remove the cabin floor panels from FR65 to FR70 (Ref. AMM TASK 53-00-00-000-801), (Ref. AMM D/O 06-41-53-00).

Subtask 24-92-00-160-050-A

B. Cleaning of All Wiring Installed in the AFT Cabin Underfloor Compartment (Only Contaminated Wiring).
(1) Clean wiring if there is dust or lint contamination ESPM 2055000.
(a) On the AC/DC power-distribution routes: 1P and 2P.
(b) On the flight control routes: 7S and 8S.
(c) On the engine control routes: 1S and 2S APU.
(d) On other routes: 1M and 2M.

5. Close-up
Subtask 24-92-00-410-085-A

A. Close Access
(1) Installation of the cabin floor panels from FR65 to FR70 (Ref. AMM TASK 53-00-00-400-801), (Ref. AMM D/O 06-41-53-00).
(2) Install the AFT cargo-compartment partition FR65 (Ref. AMM TASK 25-55-12-400-001).
(3) Close the access panels:

(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:26:59 UTC