Installation of the Potable-Water De-icing Heater Elements

TASK 30-73-53-400-001-A
Installation of the Potable-Water De-icing Heater Elements

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
131FF, 131GF, 131GW, 131HW, 131MW, 131SF, 825

C. 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 30-73-00-720-001-A	Functional 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
Heater Elements ** ON A/C NOT FOR ALL
Heater Elements Location ** ON A/C NOT FOR ALL
Heater Elements Location ** ON A/C NOT FOR ALL
Heater Elements Location ** ON A/C NOT FOR ALL
Heater Elements ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 30-73-53-860-052-A

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 ACCESS PLATFORM 2M (6 FT) is in position at the door 825.

Subtask 30-73-53-010-056-A

B. Get Access
(1) Make sure that the FWD cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(2) Make sure that the CARGO COMPT LIGHT switch 6LU is at ON.
(3) Make sure that in the FWD cargo-compartment, the panels 131GW 131HW 131GF 131FF 131SF are removed.

Subtask 30-73-53-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	POT/WASTE WIP-HEATER-LINE	1DW	A02
2000VU	POT/WASTE WIP-HEATER-CTL	2DW	A01
** ON A/C NOT FOR ALL
2000VU	POT WIP-HEATER-LINE	1DW	A02
2000VU	POT WIP-HEATER-CTL	2DW	A01

4. Procedure
Subtask 30-73-53-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Heater Elements
(1) Install the heater elements (10) on the pipe (12).

NOTE: Make sure that the heater elements are correctly installed on the bridges (13).

(2) Attach the heater elements (10) with adhesive tape (9).
(3) Connect the three wires (17) of the heater elements (10) to the terminal strip.
(4) Put the glass wool mat (7) on the pipe (12).

NOTE: Make sure that the glass wool mat (7) is in correct position on the water pipe.

(5) Put the adhesive tape (11) on the junction line of the glass wool mat (7).
(6) Put the insulation muffs (8) in position.
(7) Put the adhesive tape (6) on the junction line of the insulation muffs (8).
(8) Put the velcro tape (5) in position.
(9) Install the spacers (15) and the clamps (16).
(10) Put the label (1) in position and attach with tie.
(11) Bond the identification label (2), the DRINKING-WATER marker (4) and the flow direction marker (3).

NOTE: The flow direction arrow on the marker must point forward.

(12) Close the protective cover (14).

Subtask 30-73-53-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Heater Elements
(1) Install the heater elements (10) on the pipe (12).

NOTE: Make sure that the heater elements are correctly installed on the bridges (13).

(2) Attach the heater elements (10) with adhesive tape (9).
(3) Put the glass wool mat (7) on the pipe (12).

NOTE: Make sure that the glass wool mat (7) is in correct position on the water pipe.

(4) Put the adhesive tape (11) on the junction line of the glass wool mat (7).
(5) Put the insulation muffs (8) in position.
(6) Put the adhesive tape (6) on the junction line of the insulation muffs (8).
(7) Put the velcro tape (5) in position.
(8) Install the spacers (15) and the clamps (16).
(9) Put the label (1) in position and attach with tie.
(10) Bond the identification label (2), the DRINKING-WATER marker (4) and the flow direction marker (3).

NOTE: The flow direction arrow on the marker must point forward.

(11) Close the protective cover (14).

Subtask 30-73-53-865-052-A

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
2000VU	POT/WASTE WIP-HEATER-LINE	1DW	A02
2000VU	POT/WASTE WIP-HEATER-CTL	2DW	A01
** ON A/C NOT FOR ALL
2000VU	POT WIP-HEATER-LINE	1DW	A02
2000VU	POT WIP-HEATER-CTL	2DW	A01

Subtask 30-73-53-720-051-A

C. Do the functional test of the potable-water ice protection (Ref. AMM TASK 30-73-00-720-001).

5. Close-up
Subtask 30-73-53-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) In the FWD cargo-compartment, install the panels: 131GW 131HW 131MW 131GF 131FF 131SF.
(3) Set the CARGO COMPT LIGHT switch 6LU to OFF.
(4) Close the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(5) Remove the access platform(s).

Subtask 30-73-53-862-052-A

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

[Rev.10 from 2021] 2026.04.01 00:32:53 UTC