Installation of the Potable Water De-icing Sensor

TASK 30-73-18-400-001-A
Installation of the Potable Water De-icing Sensor

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 121
FIN: 29DW ** 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)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06ABB1)	Polysulfide Sealant-Fuel Tank Fillet -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
131GW, 825

D. 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
Sensor

3. Job Set-up

CAUTION: USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY ELECTRICITY BECAUSE THE AVIONICS VENTILATION SYSTEM IS NOT SERVICEABLE. IF YOU ENERGIZE THE AIRCRAFT ELECTRICAL CIRCUITS WITHOUT THE VENTILATION SYSTEM YOU WILL CAUSE DAMAGE TO ELECTRICAL EQUIPMENT.

Subtask 30-73-18-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 30-73-18-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10
123VU	AVNCS VENT/EXTC/FAN	2HQ	AE02
2000VU	POT/WASTE WIP-HEATER-LINE	21DW	A03
2000VU	POT/WASTE WIP-HEATER-CTL	2DW	A01

Subtask 30-73-18-010-052-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the FWD cargo-compartment door 825.
(2) Make sure that the FWD cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(3) Make sure that the CARGO COMPT LIGHT switch 6LU is in the ON position.
(4) In the FWD cargo compartment, make sure that the sidewall panel 131GW is removed.

4. Procedure
Subtask 30-73-18-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Potable Water De-icing Sensor
(1) On the potable water pipe, install the clamp sensor assembly (2) with the clamp (3).
(2) Install and tighten the screws (4) and (5) of the clamp sensor assembly (2) and clamp (3).
(3) Connect the two wires of the sensor to the terminal strip.
(4) Apply a layer of glass wool mat (6) around the clamp sensor assembly (2).
(5) Make sure that the glass wool mat (6) is correctly applied around the sensor and the pipes.
(6) Use tie-down straps to attach the glass wool mat around the clamp sensor assembly (2).

Subtask 30-73-18-914-050-A ** ON A/C NOT FOR ALL

B. Apply Sealant

NOTE: Make sure that the half shell assembly is dry and clean.

(1) Apply Polysulfide Sealant-Fuel Tank Fillet - (Material No.06ABB1) to the half shell assembly.

Subtask 30-73-18-865-052-A ** ON A/C NOT FOR ALL

C. 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
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10
123VU	AVNCS VENT/EXTC/FAN	2HQ	AE02
2000VU	POT/WASTE WIP-HEATER-LINE	21DW	A03
2000VU	POT/WASTE WIP-HEATER-CTL	2DW	A01

Subtask 30-73-18-720-050-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 30-73-18-410-052-B ** ON A/C NOT FOR ALL

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 sidewall panel 131GW.
(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 30-73-18-862-051-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 00:32:39 UTC