Removal of the Waste-Water De-icing Heater Elements

TASK 30-71-53-000-003-A
Removal of the Waste-Water De-icing Heater Elements

ZONE: 127
FIN: 142DU ** ON A/C NOT FOR ALL
FIN: 146DU ** ON A/C NOT FOR ALL
FIN: 147DU ** ON A/C NOT FOR ALL

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
127	REAR AVIONIC COMPARTMENT
825
FOR [142DU] (HEATER-TAPE, WASTE WTR)
131GW
FOR [146DU] (HEATER-TAPE,)
131GW, 131HW
FOR [147DU] (HEATER-TAPE,)
131HW, 131MW

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 30-71-17-000-003-A	Removal of the Temperature Sensor
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Heater Element

3. Job Set-up
Subtask 30-71-53-861-052-A ** ON A/C NOT FOR ALL

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

Subtask 30-71-53-010-055-A ** ON A/C NOT FOR ALL

B. 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 position.
(4) In the FWD cargo-compartment, remove the panels:
(a) FOR [142DU] (HEATER-TAPE, WASTE WTR)
131GW
(b) FOR [146DU] (HEATER-TAPE,)
131GW 131HW
(c) FOR [147DU] (HEATER-TAPE,)
131HW 131MW

Subtask 30-71-53-865-056-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

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

4. Procedure
Subtask 30-71-53-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the Heater Element
(1) Remove and discard the cable ties (2) of the identification and warning labels (1).
(2) Remove the clamps (11) and the spacers (10).
(3) Remove the velcro tape (3), the adhesive tape (9) and the insulation muffs (4).
(4) Carefully remove and discard the adhesive tape (7) which is on the longitudinal cut of the insulation sleeve (8).
(5) Remove the insulation sleeve (8).
(6) Disconnect the three wires of the heater element (5) from the terminal block.

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

(7) If necessary, remove the related temperature sensor (Ref. AMM TASK 30-71-17-000-003).
(8) Remove and discard the heat-shrink sleeve that safeties both ends of the glass fiber tape (6).

NOTE: Do not damage the waste water line when you remove the heat-shrink sleeve.

(9) Remove and discard the glass fiber tape (6) that attaches the heater element (5).
(10) Remove the heater element (5).

[Rev.10 from 2021] 2026.04.01 00:32:04 UTC