Check of Fire-Extinguishing Lines for Leakage and Obstruction

TASK 26-23-00-200-001-A
Check of Fire-Extinguishing Lines for Leakage and Obstruction

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

ZONE: 130
ZONE: 140
ZONE: 150
ZONE: 160

1. Reason for the Job
Refer to the MPD TASK: 262300-03
CHECK OF FIRE EXTINGUISHING LINES FOR LEAKAGE AND OBSTRUCTION
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ADAPTER - SELF SEALING COUPLING (AS33514E10 TYPE)
No specific	2	CAP - BLANKING
No specific	AR	CAP - BLANKING (AS21914-10 TYPE)
No specific	1	GAGE 100 BAR (1450 PSI) - PRESSURE
No specific	1	NITROGEN COMPRESSED SOURCE - GROUND
No specific	AR	PLUG - BLANKING
No specific	AR	PLUG - BLANKING (AS21913-10 TYPE)
No specific	AR	PLUG-BLANKING(AS21913 TYPE)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 4.3 and 3.9 m.daN (31.71 and 28.76 lbf.ft )
10-101950-81	AR	SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE,HTL
2-100831-1	AR	PLUG-SHUNT
M83723-60-110AN	AR	PROTECTIVE CAP-FIRE EXTINGUISHER CARTRIDGE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03GEE1)	Synthetic Oil base Grease-Fuel and Oxidized Environment Fluorinated -
(Material No.14VGC1)	Individual Compound-- Nitrogen Gaseous

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
140	CENTER WING
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
160	BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT
161DW
132MW
162AW
825, 826
132SW

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-15-00-910-001-A	Handling Precautions for Electrostatic Discharge Sensitive Devices
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)
TASK 25-54-12-000-003-A	Removal of the Sidewall Panels in the Forward Cargo Compartment
TASK 25-54-12-400-003-A	Installation of the Sidewall Panels in the Forward Cargo Compartment
TASK 25-55-12-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR65
TASK 25-55-12-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR59/FR65
TASK 25-55-12-400-001-A	Installation of the Aft Cargo-Compartment Partition at FR65
TASK 25-55-12-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR59/FR65
TASK 26-16-00-710-001-A	Operational Check of Cargo Compartment Smoke Detection by PTT
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
TASK 53-42-12-000-001-A	Removal of the Cabin Floor Panels from FR47 thru FR64
TASK 53-42-12-400-001-A	Installation of the Cabin Floor Panels from FR47 thru FR64
Check of Fire-Extinguishing Distribution-Pipes for Leaks ** ON A/C NOT FOR ALL
Check of Fire-Extinguishing Distribution-Pipes for Leaks ** ON A/C NOT FOR ALL
Check of Fire-Extinguishing Distribution-Pipes for Leaks ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 26-23-00-861-055-A ** ON A/C NOT FOR ALL

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

Subtask 26-23-00-865-064-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/SDCU/CHAN1	11WQ	C06
** ON A/C NOT FOR ALL
49VU	AIR COND/CIDS/SDF/DIR2 ESS	18WH	C06
49VU	AIR COND/CIDS/SDF/DIR1 ESS	15WH	C05
49VU	AIR COND/CARGO FIRE/EXTIG/BTL2	8WX	C04
49VU	AIR COND/CARGO/FIRE/EXTIG/BTL1	1WX	C03
** ON A/C NOT FOR ALL
122VU	AIR COND/SDCU/CHAN2	12WQ	T18
** ON A/C NOT FOR ALL
122VU	AIR COND/CARGO/FIRE/EXTIG	1WX	T19
** ON A/C NOT FOR ALL
122VU	AIR COND/CIDS/SDF/DIR NORM/2	14WH	T18
122VU	AIR COND/CIDS/SDF/DIR NORM/1	17WH	T17

Subtask 26-23-00-010-050-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the forward cargo-compartment door 825 and the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001)
(2) Put the access platform in position as necessary to get access to the cargo compartment.
(3) Remove the protection panel 132SW in the forward cargo compartment (Ref. AMM TASK 25-54-12-000-003).
(4) Remove the guard assemblies from below the spray nozzles.
(5) Put a WARNING NOTICE(S) in position to tell persons that nitrogen will flow from the spray nozzles and make sure that there is a good flow of air through the work area.

Subtask 26-23-00-010-050-C ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the forward cargo-compartment door 825 and the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the access platform in position as necessary to get access to the cargo-compartment.
(3) Remove the protection panel 162AW in the aft cargo-compartment (Ref. AMM TASK 25-55-12-000-003).
(4) Remove the guard assemblies from below the spray nozzles.
(5) Put a WARNING NOTICE(S) in position to tell persons that nitrogen will flow from the spray nozzles and make sure that there is a good flow of air through the work area.

Subtask 26-23-00-010-050-E ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the forward cargo-compartment door 825 and the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the access platform in position as necessary to get access to the cargo compartment.
(3) Remove the protection panel 161DW in the aft cargo compartment (Ref. AMM TASK 25-55-12-000-001).
(4) Remove the guard assemblies from below the spray nozzles.
(5) Put a WARNING NOTICE(S) in position at the forward cargo-compartment door 825 and at the aft cargo-compartment door 826 to tell persons that nitrogen will flow from the spray nozzles.
(6) Make sure that there is a good flow of air through the work area.

Subtask 26-23-00-010-050-H ** ON A/C NOT FOR ALL

C. Get Access
(1) Remove cabin floor panel 251AF to get access to smoke detectors 5WH and 6WH (Ref. AMM TASK 53-42-12-000-001).
(2) Put a WARNING NOTICE(S) in position to tell persons to be careful about the opened floor panel.
(3) Open forward cargo-compartment door 825 and aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(4) In the forward cargo compartment, set CARGO COMPT LIGHT switch 6LU to the ON position.
(5) In the aft cargo compartment, set CARGO COMPT LIGHT switch 8LU to the ON position.
(6) Remove sidewall panel 132MW in the forward cargo-compartment (Ref. AMM TASK 25-54-12-000-003).
(7) Put a WARNING NOTICE(S) in position to tell persons that nitrogen will flow from the spray nozzles.
(8) Make sure that there is a good flow of air through the work area.

4. Procedure
Subtask 26-23-00-210-050-A ** ON A/C NOT FOR ALL

A. Check of the Distribution-Pipes of the Cargo-Compartment Fire-Extinguishing for Leaks and Blockages

Check of Fire-Extinguishing Distribution-Pipes for Leaks ** ON A/C NOT FOR ALL

(1) At the fire extinguisher bottle 4005WX or 4015WX:

WARNING: DO NOT TOUCH THE CARTRIDGE BEFORE YOU DO THE PROCEDURE APPLICABLE TO DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE EXTINGUISHER BOTTLE TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.

(a) Before you touch the cartridges, do the procedure for devices that are sensitive to electrostatic discharge (Ref. AMM TASK 20-15-00-910-001).
(b) At the cartridges of the fire extinguisher bottle:
1 Disconnect the electrical connector from the fire extinguisher cartridges.
2 Put a CAP - BLANKING on the disconnected electrical connectors.
(2) Install the shunt devices on the cartridges of the fire extinguisher bottle 4005WX or 4015WX:

WARNING: BEFORE YOU TOUCH THE POWER DEVICE CARTRIDGE, MAKE SURE THAT YOU ARE GROUNDED AND THAT YOU INSTALL A SHUNT DEVICE ON IT. USE A CAP OR PLUG AS SHUNT DEVICE (THE CAP OR PLUG WILL SHUNT THE PINS TOGETHER ON THE CARTRIDGE). DO NOT USE A FOIL SHUNT. IF YOU TOUCH A POWER DEVICE CARTRIDGE THAT DOES NOT HAVE A SHUNT DEVICE INSTALLED, AN EXPLOSION CAN OCCUR AND CAUSE INJURIES TO YOU.

(a) For the fire extinguisher bottle with the Part Number 34600017 or 34600025-1:
1 Install a 10-101950-81 SHUNT PLUG-FIRE EXTINGUISHER CARTRIDGE,HTL on the cartridges.
(b) For the fire extinguisher bottle with the Part Number 34600049-1:
1 Install a 2-100831-1 PLUG-SHUNT on the cartridges.

NOTE: As an alternative a M83723-60-110AN PROTECTIVE CAP-FIRE EXTINGUISHER CARTRIDGE can be used.

(3) Connect the NITROGEN COMPRESSED SOURCE - GROUND, nitrogen (gaseous) Individual Compound-- Nitrogen Gaseous (Material No.14VGC1) to the flexible hoses of the fire extinguisher bottle 4005WX or 4015WX:
(a) At the fire-extinguisher bottle 4005WX or 4015WX, disconnect the flexible hoses from:

The FWD COMPT discharge head outlet
The AFT COMPT discharge head outlet
The safety relief valve.

(b) Make sure that there are no signs of damage on the discharge outlets:

Cracks
Corrosion
Crossed threads
Stripped threads
Chafing
Scoring.

(c) Put a PLUG - BLANKING on the discharge head outlets and the safety relief valve.
(d) Put a PLUG - BLANKING (AS21913-10 TYPE) on the flexible hose for the forward cargo compartment.
(e) Connect the ground pressure source with the GAGE 100 BAR (1450 PSI) - PRESSURE to the flexible hose for the aft cargo compartment. Use an applicable ADAPTER - SELF SEALING COUPLING (AS33514E10 TYPE).
(4) Do a check of the aft distribution pipes of the fire extinguisher bottle 4005WX or 4015WX:
(a) Operate the ground pressure source to approximately 3.0 bar (43.5113 psi).
(b) In the aft cargo compartment, make sure that there is a good flow of nitrogen from the spray nozzle(s) and from the hose for the safety relief valve.

NOTE: The nitrogen flows directly from the ground pressure source to the spray nozzle(s).

(c) Stop the supply of the ground pressure.
(d) In the aft cargo compartment, loosen the coupling nut(s) and remove the spray nozzle(s) from the discharge outlet(s).
(e) Install a CAP - BLANKING (AS21914-10 TYPE) on the discharge outlet(s) of the spray nozzle(s).
(f) Pressurize the pipes:

WARNING: MAKE SURE THAT NO PERSONS ARE IN THE LOWER DECK CARGO COMPARTMENT DURING THE TEST. PUT A WARNING NOTICE IN POSITION TO TELL PERSONS NOT TO GO INTO THE LOWER DECK CARGO COMPARTMENT. THE HIGH PRESSURE IN THE HOSES/PIPES CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT.

1 Slowly and carefully operate the ground pressure source and pressurize the distribution pipes of the aft cargo compartment to approximately 60.0 bar (870.2262 psi).
(g) At the ground pressure source, stop the supply of nitrogen.
(h) On the manometer, after 5 minutes, make sure that the pressure does not decrease.
(i) Release the pressure from the distribution pipes of the aft cargo compartment.
(j) Disconnect the ground pressure source and the GAGE 100 BAR (1450 PSI) - PRESSURE from the flexible hose for the aft cargo compartment.
(k) Put a PLUG - BLANKING (AS21913-10 TYPE) on the flexible hose for the aft cargo compartment.
(5) Do a check of the forward distribution pipes of the fire extinguisher bottle 4005WX or 4015WX:
(a) Remove the PLUG - BLANKING (AS21913-10 TYPE) from the flexible hose for the forward cargo compartment.
(b) Connect the ground pressure source with the GAGE 100 BAR (1450 PSI) - PRESSURE to the flexible hose for the forward cargo compartment.
(c) Operate the ground pressure source to approximately 3.0 bar (43.5113 psi).
(d) Make sure that there is a good flow of nitrogen from the forward cargo compartment spray nozzle(s).

NOTE: The nitrogen flows directly from the ground pressure source to the spray nozzle(s).

(e) Stop the supply of the ground pressure.
(f) In the forward cargo compartment, loosen the coupling nut(s) and remove the spray nozzle(s) from the discharge outlet(s).
(g) Install a CAP - BLANKING (AS21914-10 TYPE) on the discharge outlet(s) of the spray nozzle(s).
(h) Pressurize the pipes:

1 Slowly and carefully operate the ground pressure source and pressurize the distribution pipes of the forward cargo compartment to approximately 60.0 bar (870.2262 psi).
(i) At the ground pressure source, stop the supply of nitrogen.
(j) On the manometer, after 5 minutes, make sure that the pressure does not decrease.
(k) Release the pressure from the distribution pipes of the forward cargo compartment.
(l) Disconnect the ground pressure source and the GAGE 100 BAR (1450 PSI) - PRESSURE from the flexible hose for the forward cargo compartment.
(6) At the fire extinguisher bottle 4005WX or 4015WX:
(a) Remove the PLUG - BLANKING from the discharge head outlets and the safety relief valve.
(b) Apply grease:

CAUTION: APPLY A SMALL QUANTITY OF THE CORRECT GREASE TO THE MALE THREADS OF THE CONNECTIONS. THIS WILL PREVENT DAMAGE TO THE THREADS. MAKE SURE THAT GREASE DOES NOT GO INTO THE PIPES. GREASE IN THE PIPES CAN CAUSE A MALFUNCTION OF THE SYSTEM.

1 Apply a small quantity of Synthetic Oil base Grease-Fuel and Oxidized Environment Fluorinated - (Material No.03GEE1) on the first three threads of the male connections.
(c) Remove the PLUG - BLANKING (AS21913-10 TYPE) from the flexible hose for the aft cargo compartment.
(d) Remove the PLUG-BLANKING(AS21913 TYPE) from the flexible hose for the safety relief valve.
(e) Connect the flexible hoses to the FWD COMPT and the AFT COMPT discharge head outlets.
(f) TORQUE the flexible hose nuts to between 4.3 and 3.9 m.daN (31.71 and 28.76 lbf.ft )

.
(g) Connect the flexible hose to the safety relief valve.
(h) TORQUE the flexible hose nut to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

.
(i) Remove the CAP - BLANKING (AS21914-10 TYPE) from the discharge outlets of the spray nozzles in the forward and in the aft cargo compartment.
(j) Install the spray nozzles.
(7) Procedure for devices that are sensitive to electrostatic discharge:

1 Remove the shunt devices from the fire extinguisher cartridges.
2 Remove the CAP-BLANKING from each electrical connector and receptacle.
3 Make sure that all the electrical connections are clean and in the correct condition.
4 Connect the electrical connectors to the cartridges.

Subtask 26-23-00-865-065-A ** ON A/C NOT FOR ALL

B. 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/SDCU/CHAN1	11WQ	C06
** ON A/C NOT FOR ALL
49VU	AIR COND/CIDS/SDF/DIR2 ESS	18WH	C06
49VU	AIR COND/CIDS/SDF/DIR1 ESS	15WH	C05
49VU	AIR COND/CARGO FIRE/EXTIG/BTL2	8WX	C04
49VU	AIR COND/CARGO/FIRE/EXTIG/BTL1	1WX	C03
** ON A/C NOT FOR ALL
122VU	AIR COND/SDCU/CHAN2	12WQ	T18
** ON A/C NOT FOR ALL
122VU	AIR COND/CARGO/FIRE/EXTIG	1WX	T19
** ON A/C NOT FOR ALL
122VU	AIR COND/CIDS/SDF/DIR NORM/2	14WH	T18
122VU	AIR COND/CIDS/SDF/DIR NORM/1	17WH	T17

Subtask 26-23-00-710-055-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do the operational test of the cargo-compartment smoke-detection system with the Push-To-Test (PTT) pushbutton switch (Ref. AMM TASK 26-16-00-710-001).

5. Close-up
Subtask 26-23-00-410-061-B ** ON A/C NOT FOR ALL

A. Close Access
(1) In the forward and aft cargo compartment, install the guard assemblies below the spray nozzles.
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Install the protection panel 132SW in the forward cargo compartment (Ref. AMM TASK 25-54-12-400-003)
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(6) Close the forward cargo compartment door 825 and the aft cargo compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 26-23-00-410-061-C ** ON A/C NOT FOR ALL

A. Close Access
(1) In the forward and aft cargo-compartment, install the guard assemblies below the spray nozzles.
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Install the protection panel 162AW in the aft cargo-compartment (Ref. AMM TASK 25-55-12-400-003).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(6) Close the forward cargo-compartment door 825 and the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 26-23-00-410-061-E ** ON A/C NOT FOR ALL

A. Close Access
(1) In the forward and aft cargo compartment, install the guard assemblies below the spray nozzles.
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Install the protection panel 161DW in the aft cargo compartment (Ref. AMM TASK 25-55-12-400-001).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(6) Close the forward cargo-compartment door 825 and the aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 26-23-00-410-061-H ** ON A/C NOT FOR ALL

A. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Install sidewall panel 132MW in the forward cargo-compartment (Ref. AMM TASK 25-54-12-400-003).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(5) In the forward cargo compartment, set CARGO COMPT LIGHT switch 6LU to the OFF position.
(6) In the aft cargo compartment, set CARGO COMPT LIGHT switch 8LU to the OFF position.
(7) Close forward cargo-compartment door 825 and aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).
(8) In the cabin area, install the guard assemblies below the spray nozzles for smoke detectors 5WH and 6WH.
(9) Remove the WARNING NOTICE(S).
(10) Make sure that the work area is clean and clear of tools and other items.
(11) Install cabin floor panel 251AF (Ref. AMM TASK 53-42-12-400-001).

Subtask 26-23-00-862-054-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:46:00 UTC