Check of the remaining Squib Integrity

TASK 26-22-00-040-008-A
Check of the remaining Squib Integrity

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: DO NOT GO IN THE APU COMPARTMENT. IF THE FIRE EXTINGUISHER ACCIDENTALLY FIRES, IT CAN CAUSE INJURY TO PERSONNEL.

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	NO	YES	1.5	0.7	2

1. Reason for the Job
MMEL 26-22-03A
SQUIB OF THE APU FIRE EXTINGUISHER BOTTLE
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	1	BOOMSET 600 OHMS
No specific	1	FLASHLIGHT
No specific	1	HEADSET 600 OHMS
No specific	1	MULTIMETER - STANDARD
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
6971-0010	1	CAP SHUNT-FIRE BOTTLE
MS25043-10DA	1	CARTRIDGE CAP

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 52-41-23-010-801-A	Opening of Access Door 314AR
TASK 52-41-23-410-801-A	Closing of Access Door 314AR
APU FIRE-EXTINGUISHER BOTTLE

3. Job Set-up
Subtask 26-22-00-941-061-A

A. Safety Precautions
(1) Put a WARNING NOTICE(S) in position on the overhead panel 20VU to tell persons not to operate the APU.

Subtask 26-22-00-865-083-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 26-22-00-860-064-A

C. 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).
(2) On the CAPT jack panel, connect the HEADSET 600 OHMS to the related connector.
(3) On the overhead panel 50VU, make sure that the ON legend on the SVCE INT OVRD pushbutton switch is off.

Subtask 26-22-00-010-063-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the access door 314AR.
(2) Open access door 314AR and safety it in the open position.
(Ref. AMM TASK 52-41-23-010-801).
(3) If necessary, use a FLASHLIGHT.
(4) In Zone 314, connect the BOOMSET 600 OHMS to the service interphone jack.
(5) Disconnect the electrical connector (2) from the cartridge (1).
(6) Put a MS25043-10DA CARTRIDGE CAP (3) on the cartridge (1).
(7) On the electrical connector (2), temporarily ground the pins A and B.

Subtask 26-22-00-010-063-B ** ON A/C NOT FOR ALL

D. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the access door 314AR.
(2) Open access door 314AR and safety it in the open position.
(Ref. AMM TASK 52-41-23-010-801).
(3) If necessary, use a FLASHLIGHT.
(4) In Zone 314, connect the BOOMSET 600 OHMS to the service interphone jack.
(5) Disconnect the electrical connector (2) from the cartridge (1).
(6) Put a 6971-0010 CAP SHUNT-FIRE BOTTLE (3) or CAP SHUNT-FIRE BOTTLE (CAPLUGS LLC CEC-10) (3) on the cartridge (1).
(7) On the electrical connector (2), temporarily ground the pins A and B.

Subtask 26-22-00-865-085-A

E. 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

4. Procedure
Subtask 26-22-00-710-072-A ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT THE OHMMETER HAS A MAXIMUM CURRENT OF 1 AMP. IF THE CURRENT IS MORE THAN 1 AMP, IT CAN CAUSE AN EXPLOSION OF THE CARTRIDGE.

APU FIRE-EXTINGUISHER BOTTLE ** ON A/C NOT FOR ALL

NOTE: For this test procedure, we recommend that a minimum of two persons are in constant contact with each other through the service interphone system. One person to monitor APU FIRE panel 20VU at cockpit and the other person to be at zone 314.

ACTION	RESULT
1.On APU FIRE panel 20VU: Push and hold the TEST pushbutton switch.	On APU FIRE panel 20VU: The white SQUIB legend comes on.
Release the TEST pushbutton switch.	The white SQUIB legend goes off.
2.If the test is correct, the cartridge is defective: Do the subsequent test to make sure that a minimum of one squib is operative. 3.If the test is not correct, the FIRE system test or the extinguish wiring is defective: Do the applicable troubleshooting procedure.
4.Remove the MS25043-10DA CARTRIDGE CAP (3) from the cartridge (1).
5.On the electrical connector (2): Connect the MULTIMETER - STANDARD to pin A and the ground.	On the MULTIMETER - STANDARD: 1 ohm +/- 0.1 is shown.
	The squib A is operative.
6.On the electrical connector (2): Connect the MULTIMETER - STANDARD to pin B and the ground.	On the MULTIMETER - STANDARD: 1 ohm +/- 0.1 is shown.
	The squib B is operative.
7.Install the MS25043-10DA CARTRIDGE CAP (3) on the cartridge (1).

Subtask 26-22-00-710-072-B ** ON A/C NOT FOR ALL

WARNING: MAKE SURE THAT THE OHMMETER HAS A MAXIMUM CURRENT OF 1 AMP. IF THE CURRENT IS MORE THAN 1 AMP, IT CAN CAUSE AN EXPLOSION OF THE CARTRIDGE.

APU FIRE-EXTINGUISHER BOTTLE ** ON A/C NOT FOR ALL

ACTION	RESULT
1.On APU FIRE panel 20VU: Push and hold the TEST pushbutton switch.	On APU FIRE panel 20VU: The white SQUIB legend comes on.
Release the TEST pushbutton switch.	The white SQUIB legend goes off.
2.If the test is correct, the cartridge is defective: Do the subsequent test to make sure that a minimum of one squib is operative. 3.If the test is not correct, the FIRE system test or the extinguish wiring is defective: Do the applicable troubleshooting procedure.
4.Remove the 6971-0010 CAP SHUNT-FIRE BOTTLE (3) or CAP SHUNT-FIRE BOTTLE (CEC-10) (3) from the cartridge (1).
5.On the electrical connector (2): Connect the MULTIMETER - STANDARD to pin A and the ground.	On the MULTIMETER - STANDARD: 1 ohm +/- 0.1 is shown.
	The squib A is operative.
6.On the electrical connector (2): Connect the MULTIMETER - STANDARD to pin B and the ground.	On the MULTIMETER - STANDARD: 1 ohm +/- 0.1 is shown.
	The squib B is operative.
7.Install the 6971-0010 CAP SHUNT-FIRE BOTTLE (3) or CAP SHUNT-FIRE BOTTLE (CAPLUGS LLC CEC-10) (3) on the cartridge (1).

5. Close-up
Subtask 26-22-00-860-074-A

A. Put the system back to the serviceable condition.
(1) On the electrical connector (2), remove the temporary ground connection from pin A and pin B.

Subtask 26-22-00-865-084-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 26-22-00-410-064-A ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) Remove the MS25043-10DA CARTRIDGE CAP (3) from the cartridge (1).
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Connect the electrical connector (2) to the cartridge (1).
(4) Disconnect the BOOMSET 600 OHMS from the service interphone jack.
(5) Disconnect the HEADSET 600 OHMS from the CAPT jack panel.
(6) Make sure that the work area is clean and clear of tools and other items.
(7) Close access door 314AR (Ref. AMM TASK 52-41-23-410-801).
(8) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(9) Remove the access platform(s).
(10) Remove the WARNING NOTICE(S) from the panel 25VU.
(11) Make an entry in the aircraft technical logbook.

Subtask 26-22-00-410-064-B ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) Remove the 6971-0010 CAP SHUNT-FIRE BOTTLE (3) or CAP SHUNT-FIRE BOTTLE (CAPLUGS LLC CEC-10) (3) from the cartridge (1).
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Connect the electrical connector (2) to the cartridge (1).
(4) Disconnect the BOOMSET 600 OHMS from the service interphone jack.
(5) Disconnect the HEADSET 600 OHMS from the CAPT jack panel.
(6) Make sure that the work area is clean and clear of tools and other items.
(7) Close access door 314AR (Ref. AMM TASK 52-41-23-410-801).
(8) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(9) Remove the access platform(s).
(10) Remove the WARNING NOTICE(S) from the panel 25VU.
(11) Make an entry in the aircraft technical logbook.

Subtask 26-22-00-865-086-A

D. 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 23:45:26 UTC