Reactivation of the Waste-Water Drain Mast Heating-System

TASK 30-71-00-440-001-A
Reactivation of the Waste-Water Drain Mast Heating-System

ZONE: 200

1. Reason for the Job
MMEL 30-71-01A
WASTE WATER DRAIN MAST HEATING SYSTEM
MMEL 30-71-01B
WASTE WATER DRAIN MAST HEATING SYSTEM
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TSM 30-71-00-810-801	FWD Drain-mast Heater-Failure
TSM 30-71-00-810-802	AFT Drain mast-Heater Failure
TSM 30-71-00-810-803	Control Unit Failure of FWD Drainmast
TSM 30-71-00-810-804	Control Unit Failure of AFT Drainmast
TSM 30-71-00-810-809	MID Drainmast-Heater Failure
TSM 30-71-00-810-810	Control Unit Failure of MID Drainmast
Potable Water Lavatory Shutoff Valve

3. Job Set-up
Subtask 30-71-00-861-050-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

4. Procedure
Subtask 30-71-00-865-073-A

A. 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	WASTE WIP-DRAINMAST-FWD	1DU	B06
** ON A/C NOT FOR ALL
2000VU	DRAINMAST-FWD	1DU	B03
** ON A/C NOT FOR ALL
2000VU	WASTE WIP-DRAINMAST-FWD	1DU	B03
** ON A/C ALL
2001VU	WASTE WIP-DRAINMAST-AFT	11DU	E01
** ON A/C NOT FOR ALL
2001VU	WASTE WIP-DRAINMAST-MID	21DU	E02

Subtask 30-71-00-440-050-A ** ON A/C NOT FOR ALL

B. Reactivation
(1) Do the trouble-shooting of the waste-water drainmast heating-system:
TSM 30-71-00-810-801 FWD Drainmast-Heater Failure
and/or
TSM 30-71-00-810-802 AFT Drainmast-Heater Failure
and/or
TSM 30-71-00-810-803 CTL Unit Failure of FWD Drainmast
and/or
TSM 30-71-00-810-804 CTL Unit Failure of AFT Drainmast
(2) Do the subsequent steps to reactivate the related galley(s):

Remove the placard.
Open the shutoff valve of the related galley.

(3) Do the subsequent steps to reactivate the related lavatory(ies):

Unlock and open the lavatory door.
Remove the placard from the lavatory.
Open the shutoff valve of the lavatory washbasin.

(4) Make a record of the reactivation(s) in the aircraft technical logbook.
(5) Make sure that the lavatory washbasin is serviceable.
(6) Make sure that the work area is clean and clear of tools and other items.
(7) Close the lavatory door.

Subtask 30-71-00-440-050-B ** ON A/C NOT FOR ALL

B. Reactivation
(1) Do the trouble-shooting of the waste-water drainmast heating-system:
TSM 30-71-00-810-801 FWD Drainmast-Heater Failure
and/or
TSM 30-71-00-810-809 MID Drainmast-Heater Failure
and/or
TSM 30-71-00-810-802 AFT Drainmast-Heater Failure
and/or
TSM 30-71-00-810-803 CTL Unit Failure of FWD Drainmast
and/or
TSM 30-71-00-810-810 CTL Unit Failure of MID Drainmast
and/or
TSM 30-71-00-810-804 CTL Unit Failure of AFT Drainmast
(2) Do the subsequent steps to reactivate the related galley(s):

Remove the placard.
Open the shutoff valve of the related galley.

(3) Do the subsequent steps to reactivate the related lavatory(ies):

Unlock and open the lavatory door.
Remove the placard from the lavatory.
Open the shutoff valve of the lavatory washbasin.

5. Close-up
Subtask 30-71-00-862-058-A

A. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:31:40 UTC