Potable Water System - Pressurization Failure

TASK 38-41-00-810-801-A
Potable Water System - Pressurization Failure

1. Possible Causes

SHUTTLE VALVE-AIR [4215MM]
FILTER-AIR [4210MM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-15-38-613-001	Fill the Potable Water Tank System (Aircraft Electrical Power Available)
AMM 38-10-00-614-001	Pressurization of the Potable Water System from a Ground Air Supply
AMM 38-10-00-614-002	Depressurization of the Potable Water System
AMM 38-41-00-610-001	Discard System Filter Element
AMM 38-41-44-000-001	Removal of the Shuttle Valve
AMM 38-41-44-400-001	Installation of the Shuttle Valve

3. Fault Confirmation
Subtask 38-41-00-710-050-A

A. Aircraft configuration
(1) Make sure that there is water in the potable water system, if necessary do the servicing AMM 12-15-38-613-001.

4. Fault Isolation
Subtask 38-41-00-810-050-A

A. Operate the APU and pressurized the potable water system AMM 38-10-00-614-001.
(1) If the potable water system does not pressurize:

do the pressurization from the ground service panel AMM 38-10-00-614-001.

(2) If the potable water system pressurizes from the ground service panel:

remove and clean the SHUTTLE VALVE-AIR [4215MM] ,
replace the shuttle valve AMM 38-41-44-000-001 and AMM 38-41-44-400-001.

(3) If the shuttle valve is found contaminated:

replace the cartridge filter of the FILTER-AIR [4210MM] , AMM 38-41-00-610-001.

5. Close-up
Subtask 38-41-00-710-051-A

A. Do a check and make sure that the system operates correctly with:
(1) From the ground service panel AMM 38-10-00-614-001
(2) From the APU AMM 38-10-00-614-002

[Rev.8 from Aug 2018] 2026.04.04 04:34:17 UTC