Installation of the Flush Control Unit

TASK 38-31-12-400-001-A
Installation of the Flush Control Unit

NOTE: The procedure for the installation of the flush control unit is the same for all lavatories.

ZONE: 200

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

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 25-45-22-000-001-A	Removal of the Toilet Shroud and the Seat
TASK 25-45-22-400-001-A	Installation of the Toilet Shroud and the Seat
TASK 38-31-00-710-009-A	Operational Test of the Toilet Unit
Flush Control Unit

3. Job Set-up
Subtask 38-31-12-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the lavatory door is open.
(3) Make sure that the toilet shroud is removed (Ref. AMM TASK 25-45-22-000-001).

Subtask 38-31-12-865-057-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	VACU TOIL SYS-VACUUM-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACUUM-GEN	33MG	A08
2001VU	VACU TOIL SYS-LAV PWR-E	34MG	A04
2001VU	VACU TOIL SYS-LAV PWR-D	39MG	A03
2001VU	VACU TOIL SYS-LAV PWR-A	32MG	A01
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	45MG	A02
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-VACU-SYS	35MG	A06
** ON A/C NOT FOR ALL
2001VU	VACU TOIL SYS-LAV PWR-L	23MG	A05

4. Procedure
Subtask 38-31-12-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Flush Control Unit
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Put the flush control unit (5) in position.
(4) Install the washers (2), the bolts (1) and the nuts (3).
(5) Remove the CAP-BLANKING from each electrical connector and receptacle.
(6) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: MAKE SURE THAT ELECTRICAL CONNECTORS ARE CLEAN WHEN YOU CONNECT THEM. THE CONTAMINATION OF ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO THE EQUIPMENT.

(7) Connect the electrical connectors (4), (6), (7) and (8).

Subtask 38-31-12-710-050-A ** ON A/C NOT FOR ALL

B. Do an operational test of the toilet unit to make sure that it flushes correctly (Ref. AMM TASK 38-31-00-710-009).

5. Close-up
Subtask 38-31-12-410-050-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 toilet shroud (Ref. AMM TASK 25-45-22-400-001).
(3) Close the lavatory door.

Subtask 38-31-12-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 01:20:16 UTC