Removal of Heated Drain Nipple

TASK 30-72-52-000-002-A
Removal of Heated Drain Nipple

ZONE: 160
ZONE: 170
FIN: 21DV ** 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	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	ELEC CONTACTS INSERTION EXTRACTION TOOL M15570-20
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SCRAPER - NON METALLIC

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
160	BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT
170	AFT CAB U/FLOOR COMPT AFT BHD OF BULK
162DW, 172AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-16-38-613-001-A	Servicing of the Toilet System
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Lavatory Drain Nipple 21DV ** ON A/C NOT FOR ALL
Drain Nipple 21DV ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 30-72-52-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) Drain the toilet system (Ref. AMM TASK 12-16-38-613-001).

Subtask 30-72-52-865-060-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2001VU	POT/WASTE WIP-SVCE-PNL	15DV	D01
** ON A/C NOT FOR ALL
2001VU	WASTE WIP-HEATER-LINE	31DU	E04
** ON A/C NOT FOR ALL
2001VU	POT WIP-SVCE-PNL	15DV	D01

Subtask 30-72-52-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the waste water service-panel and open the access door 172AR.
(2) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(3) Set cargo-compartment light switch 8LU to ON position.
(4) Remove partition 162DW to get access to the nipple(s) and terminal block 7585VT (Ref. AMM TASK 25-55-12-000-001).

4. Procedure
Subtask 30-72-52-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the DRAIN NIPPLE (21DV)
(1) Remove and discard the cable ties of the electrical harness.
(2) Disconnect the electrical contacts with the ELEC CONTACTS INSERTION EXTRACTION TOOL M15570-20.
(3) Disconnect the flush pipe (1) from the drain nipple (5).
(4) Put the PLUG-BLANKING in each disconnected line end.
(5) Remove the screws (8), the spacers (9), the washers (10) and the nuts (11) to remove the cap assy (7) from the drain nipple (5).
(6) Remove the screws (6), the washers (3) and nuts (2) from the drain nipple (5).
(7) Remove the sealant around the drain nipple (5) carefully with the SCRAPER - NON METALLIC.
(8) Remove the drain nipple (5) and the insulation plate (4) from the waste-water service panel.

Subtask 30-72-52-020-052-C ** ON A/C NOT FOR ALL

A. Removal of the Heated Lavatory Drain-Nipple
(1) Remove and discard the cable ties of the electrical harness.
(2) Disconnect an electrical contact pins from terminal block 7585VT (12) with the ELEC CONTACTS INSERTION EXTRACTION TOOL M15570-20.
(3) Disconnect the waste flush pipe (1) from the drain nipple (5).
(4) Put the PLUG-BLANKING in each disconnected line end.
(5) Remove the screws (8), the spacers (9), the washers (10) and the nuts (11).
(6) Remove the cap assy (7) from the drain nipple (5).
(7) Remove the screws (6), the washers (3) and nuts (2) from the drain nipple (5).
(8) Remove the sealant around the drain nipple (5) carefully with the SCRAPER - NON METALLIC.
(9) Remove the drain nipple (5) and the insulation plate (4) from the waste water service-panel.

[Rev.10 from 2021] 2026.04.01 00:32:26 UTC