Bottle Pressure Check

TASK 26-22-00-040-004-A
Bottle Pressure Check

FIN: 11WF
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	NO	0.8	0.8	1

1. Reason for the Job
MMEL 26-01-01-05A
APU AGENT PB DISCH LIGHT
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	ALLEN KEY 3/32 IN
No specific	AR	CAP - BLANKING
No specific	1	FLASHLIGHT
No specific	AR	MULTIMETER - STANDARD
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
314AR

C. 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-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 26-22-00-040-004-A	Bottle Pressure Check
TASK 26-22-00-040-004-A-01	Bottle Weight Check
TASK 52-41-23-010-801-A	Opening of Access Door 314AR
TASK 52-41-23-410-801-A	Closing of Access Door 314AR
CHECK OF THE PRESSURE SWITCH

3. Job Set-up
Subtask 26-22-00-861-064-A

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).

Subtask 26-22-00-865-118-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38

Subtask 26-22-00-010-071-A

C. Get Access

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

(1) Put on and attach a safety harness before you start work in the work area

(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the access door 314AR.
(3) Open access door 314AR and safety it in the open position.
(Ref. AMM TASK 52-41-23-010-801).
(4) If necessary, use a FLASHLIGHT.
(5) Disconnect the electrical connector (1) from the pressure switch (4).
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

4. Procedure
Subtask 26-22-00-710-089-A

A. Test

ACTION	RESULT
1.On the connector of the pressure switch (4): Connect the leads of the MULTIMETER - STANDARD between pin B and pin C.	On the multimeter: A closed circuit is shown, indicating a pressurized bottle.
Put the ALLEN KEY 3/32 IN (2) into the pressure switch test-socket (3).
Slowly turn the Allen Key (2) clockwise or counterclockwise approx. 10 degrees.	An open circuit is shown.
Release the Allen Key (2).	A closed circuit is shown.
Remove the Allen Key (2) from the test-socket (3) and disconnect the multimeter.

NOTE: If the test is not OK, you must do the weight check of the APU fire extinguisher bottle (Ref. AMM TASK 26-22-00-040-004).

5. Close-up
Subtask 26-22-00-410-072-A

A. Close Access
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Connect the electrical connector (1) to the pressure switch (4).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Close access door 314AR (Ref. AMM TASK 52-41-23-410-801).
(6) Remove the access platform(s).
(7) Put a WARNING NOTICE(S) in the cockpit to tell the flight crew that the APU AGENT DISCH light is deactivated.
(8) Make an entry in the aircraft technical logbook.

Subtask 26-22-00-865-119-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38

[Rev.10 from 2021] 2026.03.31 23:45:22 UTC