Installation of the Potable-Water Ice-Protection Control-Unit

TASK 30-73-35-400-001-A
Installation of the Potable-Water Ice-Protection Control-Unit

NOTE: The procedure is the same for the two control units.

FIN: 33DW ** 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
152FW

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 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-11-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 30-73-00-740-001-A	BITE Test of the Potable Water Ice-Protection
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Control Unit 33DW/53DW

3. Job Set-up
Subtask 30-73-35-860-050-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 aft cargo-compartment is open (Ref. AMM TASK 52-30-00-860-001).
(3) Make sure that the CARGO COMP LT switch 8LU is set to ON.
(4) Make sure that the sidewall panel 152FW is removed (Ref. AMM TASK 25-55-11-000-003).

Subtask 30-73-35-865-055-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	POT/WASTE WIP-HEATER-LINE	51DW	D04
2001VU	POT/WASTE WIP-HEATER-LINE	31DW	D03
2001VU	POT/WASTE WIP-HEATER-CTL	32DW	D02

4. Procedure
Subtask 30-73-35-420-050-A ** ON A/C NOT FOR ALL

A. Installation of a control unit (typical)
(1) Put the control unit (2) in position on its support (6).
(2) Install the brackets (3), the washers (5) and the screws (4) on the control unit (2).
(3) Tighten the screws (4).
(4) Remove the blanking caps from the disconnected electrical connectors.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(5) Connect the electrical connector (1) to the control unit (2).

5. Close-up
Subtask 30-73-35-740-050-A ** ON A/C NOT FOR ALL

A. Do the BITE test of the potable water ice-protection (Ref. AMM TASK 30-73-00-740-001).

Subtask 30-73-35-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the sidewall panel 152FW (Ref. AMM TASK 25-55-11-400-003).
(3) Set the CARGO COMP LT switch 8LU to OFF.
(4) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).

Subtask 30-73-35-862-050-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 00:32:51 UTC