Installation of the Preselection Control Unit

TASK 38-13-34-400-001-A
Installation of the Preselection Control Unit

FIN: 7MA ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
162CW

B. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 38-13-00-710-001-A	Operational Test of the Quantity Indicating System
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Preselection Control Unit 7MA

3. Job Set-up
Subtask 38-13-34-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the electrical circuits are energized

Subtask 38-13-34-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06

4. Procedure
Subtask 38-13-34-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Preselection Control Unit
(1) Do an inspection of the component interfaces and the adjacent area.
(2) Put the preselection control unit (1) 7MA in position and install the washers (3) and the screws (2) (Ref. AMM TASK 20-28-00-912-802).
(3) Remove the blanking caps.
(4) Connect the electrical connector (4) 7MA-A.

Subtask 38-13-34-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06

Subtask 38-13-34-710-050-A ** ON A/C NOT FOR ALL

C. Do the operational test of the quantity indicating system (Ref. AMM TASK 38-13-00-710-001).

5. Close-up
Subtask 38-13-34-410-050-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 access panel 162CW.
(3) Close the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).

Subtask 38-13-34-862-050-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.02 06:25:42 UTC