Removal of the Potable-Water De-icing Heater Elements

TASK 30-73-53-000-001-A
Removal of the Potable-Water De-icing Heater Elements

ZONE: 121
ZONE: 130
ZONE: 221
FIN: 16DW
FIN: 4DW

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)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
221	FWD CAB UTILITY AREA
131FF, 131GF, 131GW, 131HW, 131SF, 825

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 52-30-00-860-001-A	Open 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 30-73-53-861-053-A

A. Energize the ground service network (Ref. AMM TASK 24-42-00-861-001).

Subtask 30-73-53-865-050-A

B. Open, safety and tag 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 30-73-53-010-050-A

C. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at the FWD cargo-compartment door 825.
(2) Open the FWD cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(3) Set the CARGO COMPT LIGHT switch 6LU to ON.
(4) In the FWD cargo-compartment, remove the panels 131GW 131HW 131GF 131FF 131SF.

4. Procedure
Subtask 30-73-53-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Heater Elements
(1) Open the protective cover (14).
(2) Cut the ties that hold the label (1).
(3) Remove the flow direction marker (3), the identification label (2) and the DRINKING-WATER marker (4).
(4) Remove the spacers (15) and the clamps (16).
(5) Remove the velcro tape (5).
(6) Remove the adhesive tape (6).
(7) Remove the insulation muffs (8).
(8) Remove the adhesive tape (11) along the glass wool mat (7).
(9) Remove the glass wool mat (7).
(10) Disconnect the three wires (17) of the heater elements (10) from the terminal strip.

NOTE: Identify all the electrical wires before you disconnect them.

(11) Remove the adhesive tape (9) from the pipe (12).
(12) Remove the heater elements (10).

Subtask 30-73-53-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Heater Elements
(1) Open the protective cover (14).
(2) Cut the ties that hold the label (1).
(3) Remove the flow direction marker (3), the identification label (2) and the DRINKING-WATER marker (4).
(4) Remove the spacers (15) and the clamps (16).
(5) Remove the velcro tape (5).
(6) Remove the adhesive tape (6).
(7) Remove the insulation muffs (8).
(8) Remove the adhesive tape (11) along the glass wool mat (7).
(9) Remove the glass wool mat (7).
(10) Remove the adhesive tape (9) from the pipe (12).
(11) Remove the heater elements (10).

[Rev.10 from 2021] 2026.04.01 00:32:52 UTC