Discard Crew Oxygen Low Pressure Supply Hose (Flexible Hose)

TASK 35-13-00-200-801-A
Discard Crew Oxygen Low Pressure Supply Hose (Flexible Hose)

WARNING: KEEP ALL HYDROCARBONS (FUELS, LUBRICANTS, ETC.) AWAY FROM ALL SOURCE OF OXYGEN. OXYGEN BECOMES EXPLOSIVE WHEN IT TOUCHES HYDROCARBONS.

WARNING: CLEAN THE TOOLS AND MAKE SURE YOUR HANDS ARE CLEAN TO PREVENT CONTAMINATION OF THE OXYGEN SYSTEM.

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

CAUTION: PUT DRY AND CLEAN METAL OR PLASTIC PLUGS ON ALL PIPES OR UNITS THAT YOU REMOVE TEMPORARILY. THEN PUT EACH PIPE OR UNIT IN A SEALED VINYL BAG. IF YOU DO NOT OBEY THESE INSTRUCTIONS, CONTAMINATION OF THE OXYGEN SYSTEM CAN OCCUR.

ZONE: 125
FIN: 5763HM ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 351000-09
DISCARD CREW OXYGEN LOW PRESSURE SUPPLY HOSE (FLEXIBLE HOSE)

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	BAG - VINYL
No specific	AR	CAP - BLANKING
No specific	AR	CAP - BLANKING, APPROVED FOR USE WITH OXYGEN
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 2.03 and 1.47 m.daN (14.97 and 10.84 lbf.ft )
No specific	Torque wrench: range to between 2.1 and 1.5 m.daN (15.49 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CCB6)	Testing Medium-Leak Detection - Oxygen System
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
812

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	RING FOR FLARED TUBE	AIPC 35-12-01-01-010
5	RING	AIPC 35-12-01-01-010
3	LP OXYGEN-SUPPLY HOSE	AIPC 35-12-01-01-090
12	RING	AIPC 35-12-81-09-010
20	RING FOR FLARED TUBE	AIPC 35-12-81-09-010
3	RING FOR FLARED TUBE	AIPC 35-12-81-09-010
7	RING FOR FLARED TUBE	AIPC 35-12-81-09-010
5	LP OXYGEN-SUPPLY-HOSE	AIPC 35-12-81-09-040
18	LP OXYGEN-SUPPLY-HOSE	AIPC 35-12-81-09-150
24	RING FOR FLARED TUBE	AIPC 35-12-81-11-030
28	RING FOR FLARED TUBE	AIPC 35-12-81-11-030
26	LP OXYGEN-SUPPLY-HOSE	AIPC 35-12-81-11-040

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
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 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 35-00-00-860-001-A	Special Precautions When Working on a Gaseous Oxygen System
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Low-Pressure Oxygen-Supply Hose ** ON A/C NOT FOR ALL
Low-Pressure Oxygen-Supply Hose ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 35-13-00-010-050-A

A. Get Access
(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:

Put a WARNING NOTICE(S) in position to tell persons not to operate the CREW SUPPLY pushbutton switch.

(3) Put an ACCESS PLATFORM 2M (6 FT) in position at access door 812.
(4) Open access door 812 (Ref. AMM TASK 52-41-00-010-002).

Subtask 35-13-00-860-050-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Fully close the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(2) Put the WARNING NOTICE(S) in position to tell persons not to open the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(3) Energize the ground service network from the external power (Ref. AMM TASK 24-42-00-861-001).

Subtask 35-13-00-870-050-A ** ON A/C NOT FOR ALL

C. Bleeding of the Oxygen System
(1) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU, push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
(2) On one oxygen-mask stowage box, push and hold the PRESS TO TEST AND RESET control button.
At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator.
(a) Keep them pushed for a minimum of three seconds.

NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow decreases.

(b) When the flow rate indicator is black and when you can no longer hear the sound of the oxygen flow:

Release the PRESS TO TEST/EMERGENCY knob.
Release the PRESS TO TEST AND RESET control button.

WARNING: MAKE SURE THAT THE PRESS TO TEST/EMERGENCY KNOB IS NOT IN THE EMERGENCY POSITION. IF IT IS IN THE EMERGENCY POSITION, THERE CAN BE A LEAK OF OXYGEN.

1 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
(3) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:

Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).

Subtask 35-13-00-860-050-B ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Fully close the manual shutoff valves of the two crew oxygen-storage cylinders (5750HM1, 5750HM2).
(2) Put the WARNING NOTICE(S) in position to tell persons not to open the manual shutoff valves of the two crew oxygen-storage cylinders (5750HM1, 5750HM2).
(3) Energize the ground service network from the external power (Ref. AMM TASK 24-42-00-861-001).

Subtask 35-13-00-870-050-B ** ON A/C NOT FOR ALL

E. Bleeding of the two Oxygen Systems
(1) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:

Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).

(2) On the Captain oxygen-mask stowage-box, push and hold the PRESS TO TEST AND RESET control button.
At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator.
(a) Keep the PRESS TO TEST AND RESET control button and the PRESS TO TEST/EMERGENCY knob pushed for a minimum of three seconds.

NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow decreases.

(b) When the flow rate indicator is black and when you no longer hear the sound of the oxygen flow:

Release the PRESS TO TEST/EMERGENCY knob.
Release the PRESS TO TEST AND RESET control button.

WARNING: MAKE SURE THAT THE PRESS TO TEST/EMERGENCY KNOB IS NOT IN THE EMERGENCY POSITION. IF IT IS IN THE EMERGENCY POSITION, THERE CAN BE A LEAK OF OXYGEN.

1 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
(3) On the First-Officer oxygen-mask stowage-box, push and hold the PRESS TO TEST AND RESET control button.
At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator.
(a) Keep the PRESS TO TEST AND RESET control button and the PRESS TO TEST/EMERGENCY knob pushed for a minimum of three seconds.

NOTE: During this time, the flow rate indicator changes from yellow to black and the volume of the sound of the oxygen flow decreases.

(b) When the flow rate indicator is black and when you no longer hear the sound of the oxygen flow:

Release the PRESS TO TEST/EMERGENCY knob.
Release the PRESS TO TEST AND RESET control button.

WARNING: MAKE SURE THAT THE PRESS TO TEST/EMERGENCY KNOB IS NOT IN THE EMERGENCY POSITION. IF IT IS IN THE EMERGENCY POSITION, THERE CAN BE A LEAK OF OXYGEN.

1 Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
(4) In the cockpit, on the OXYGEN section of the overhead control and indicating panel 21VU:

Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).

Subtask 35-13-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	OXYGEN/CREW/OXY/SPLY	1HT	HA01

4. Procedure
Subtask 35-13-00-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Low Pressure (LP) Oxygen Supply Hose

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT EQUIPMENT FROM FLEXIBLE HOSES AND RIGID TUBING. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL CAUSE DAMAGE TO THE HOSES AND TUBES.

(1) Disconnect the LP oxygen-supply hose (5763HM) (3) from the LP oxygen-supply solenoid-valve (3HT) (1).
(a) Discard the ring for flared tube (2).
(b) Put a CAP - BLANKING on the disconnected port of the LP oxygen-supply solenoid-valve (3HT) (1).
(c) Put a BAG - VINYL on the disconnected port of the LP oxygen-supply solenoid-valve (3HT) (1).
(2) Disconnect the LP oxygen-supply hose (5763HM) (3) from the pressure regulator/transmitter (4HT) (4).
(a) Discard the ring for flared tube (5).
(b) Put a CAP - BLANKING on the disconnected port of the pressure regulator/transmitter (4HT) (4).
(c) Put a BAG - VINYL on the disconnected port of the pressure regulator/transmitter (4HT) (4).
(3) Identify the unserviceable LP oxygen-supply-hose (5763HM) (3) with a mark to make sure that you will not use it again at the installation.
(4) Discard the LP oxygen-supply hose (5763HM) (3).

Subtask 35-13-00-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the LP Oxygen-Supply Hose

(1) Install a new AIPC 35-12-01-01-090 LP OXYGEN-SUPPLY HOSE (3) as follows:
(a) At the pressure regulator/transmitter (4HT) (4):
1 Remove the BAG - VINYL from the port of the pressure regulator/transmitter (4HT) (4).
2 Remove the CAP - BLANKING from the port of the pressure regulator/transmitter (4HT) (4).
3 Install a new AIPC 35-12-01-01-010 RING (5) on the LP oxygen-supply hose (5763HM) (3).
4 Connect the LP oxygen-supply hose (5763HM) (3) on the pressure regulator/transmitter (4HT) (4).
5 TORQUE the union of the LP oxygen-supply hose (5763HM) (3) to between 2.1 and 1.5 m.daN (15.49 and 11.06 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(b) At the LP oxygen-supply solenoid-valve (3HT) (1):
1 Remove the BAG - VINYL from the port of the LP oxygen-supply solenoid-valve (3HT) (1).
2 Remove the CAP - BLANKING from the port of the LP oxygen-supply solenoid-valve (3HT) (1).
3 Install a new AIPC 35-12-01-01-010 RING FOR FLARED TUBE (2) on the LP oxygen-supply solenoid-valve (3HT) (1).
4 Connect the LP oxygen-supply hose (5763HM) (3) on the LP oxygen-supply solenoid-valve (3HT) (1).
5 TORQUE the union of the LP oxygen-supply hose (5763HM) (3) to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).

Subtask 35-13-00-790-050-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Apply the solution Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the mechanical connections.
(2) Turn the manual shutoff valve

CAUTION: WHEN YOU OPEN THE MANUAL SHUTOFF VALVE ON THE CREW OXYGEN-STORAGE CYLINDER, MAKE SURE THAT:

YOU TURN IT VERY SLOWLY
YOU TURN IT UNTIL IT IS FULLY OPEN.

IF YOU TURN THE MANUAL SHUTOFF VALVE TOO QUICKLY, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT. IF THE MANUAL SHUTOFF VALVE IS NOT FULLY OPEN, THE OXYGEN PRESSURE DATA CAN BE INCORRECT.

(a) Turn the manual shutoff valve of the crew oxygen-storage cylinder (5750HM) very slowly until it is fully open.
(3) Examine each connection to make sure that there are no leaks.
(4) Remove the solution Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) from the mechanical connections with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .

Subtask 35-13-00-020-050-B ** ON A/C NOT FOR ALL

D. Removal of the Low Pressure (LP) Oxygen-Supply Hoses

Low-Pressure Oxygen-Supply Hose ** ON A/C NOT FOR ALL

NOTE: The disconnected line ends must not stay open without protection for more than six minutes. It is necessary to install the vinyl bags and the blanking plugs on the disconnected line ends immediately after you disconnect them.

(1) Removal of the LP oxygen-supply hose (5770HM1) (18).
(a) Remove the screw (15) and washer (16) from the bracket (14).
(b) Remove the clamp (17).
(c) Disconnect one end of the LP oxygen-supply hose (5770HM1) (18) as follows:
1 Disconnect the LP oxygen-supply hose (5770HM1) (18) from the LP oxygen-supply solenoid-valve (3HT1) (22).
2 Discard the ring for flared tube (20).
3 Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected port (21) of the LP oxygen-supply solenoid valve (3HT1) (22).
4 Put a BAG - VINYL on the disconnected port (21) of the LP oxygen-supply solenoid valve (3HT1) (22).
(d) Disconnect the other end of the LP oxygen-supply hose (5770HM1) (18) as follows:
1 Disconnect the LP oxygen supply hose (5770HM1) (18) from the pipe (10).
2 Discard the ring for flared tube (12).
3 Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected port (11) of the pipe (10).
4 Put a BAG - VINYL on the disconnected port (11) of the pipe (10).
(e) Discard the LP oxygen-supply hose (5770HM1) (18) and put a not serviceable mark on it.
(2) Removal of the LP oxygen-supply hose (5763HM1) (5).
(a) Disconnect one end of the LP oxygen supply hose (5763HM1) (5) as follows:
1 Disconnect the LP oxygen supply hose (5763HM1) (5) from the pipe (10).
2 Discard the ring for flared tube (7).
3 Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected port (8) of the pipe (10).
4 Put a BAG - VINYL on the disconnected port (8) of the pipe (10).
(b) Disconnect the other end of the LP oxygen supply hose (5763HM1) (5) as follows:
1 Disconnect the LP oxygen-supply hose (5763HM1) (5) from the pressure regulator/transmitter (4HT) (1).
2 Discard the ring for flared tube (3).
3 Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected port (2) of the pressure regulator/transmitter (4HT) (1).
4 Put a BAG - VINYL on the disconnected port (2) of the pressure regulator/transmitter (4HT) (1).
(c) Discard the LP oxygen-supply hose (5763HM1) (5) and put a not serviceable mark on it.
(3) Removal of the LP oxygen-supply hose (5763HM2) (26).
(a) Disconnect one end of the LP oxygen-supply hose (5763HM2) (26) as follows:
1 Disconnect the LP oxygen-supply hose (5763HM2) (26) from the port (23).
2 Discard the ring for flared tube (24).
3 Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected port (23).
4 Put a BAG - VINYL on the disconnected port (23).
(b) Disconnect the other end of the LP oxygen-supply hose (5763HM2) (26) as follows:
1 Disconnect the LP oxygen supply hose (5763HM2) (26) from the pressure regulator/transmitter (4HT2) (30).
2 Discard the ring for flared tube (28).
3 Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected port (29) of the pressure regulator/transmitter (4HT2) (30).
4 Put a BAG - VINYL on the disconnected port (29) of the pressure regulator/transmitter (4HT2) (30).
(c) Discard the LP oxygen-supply hose (5763HM2) (26) and put a not serviceable mark on it.

Subtask 35-13-00-420-050-B ** ON A/C NOT FOR ALL

E. Installation of the LP Oxygen-Supply Hoses

NOTE: The disconnected line ends must not stay open without protection for more than six minutes. It is necessary to remove the vinyl bags and the blanking plugs from the disconnected line ends immediately before you connect them.

(1) Installation of the LP oxygen-supply hose (5770HM1) (18):
(a) Connect one end of the LP oxygen-supply hose (5770HM1) (18) as follows:
1 Remove the BAG - VINYL from the disconnected port (11) of the pipe (10).
2 Remove the CAP - BLANKING, APPROVED FOR USE WITH OXYGEN from the disconnected port (11) of the pipe (10).
3 Install a new AIPC 35-12-81-09-010 RING (12) on the disconnected port (11) of the pipe (10).
4 Connect the new AIPC 35-12-81-09-150 LP OXYGEN-SUPPLY-HOSE (18) (5770HM1) on the pipe (10).
5 TORQUE the nut (13) to the port (11) to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(b) Connect the other end of the LP oxygen-supply hose (5770HM1) (18) as follows:
1 Remove the BAG - VINYL from the disconnected port (21) of the LP oxygen-supply solenoid-valve (3HT1) (22).
2 Remove the CAP - BLANKING, APPROVED FOR USE WITH OXYGEN from the disconnected port (21) of the LP oxygen-supply solenoid-valve (3HT1) (22).
3 Install a new AIPC 35-12-81-09-010 RING FOR FLARED TUBE (20) on the disconnected port (21) of the LP oxygen-supply solenoid-valve (3HT1) (22).
4 Connect the new LP oxygen-supply-hose (5770HM1) (18) on the LP oxygen-supply solenoid-valve (3HT1) (22).
5 TORQUE the nut (19) to the LP oxygen-supply solenoid-valve (3HT1) (22) to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

.
a Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(c) Put the clamp (17) in position on the LP oxygen-supply hose (5770HM1) (18).
(d) Install the clamp (17) on the bracket (14) with the screw (15) and washer (16).
(e) Tighten the screw (15) on the bracket (14).
(f) Make sure that orientation Y between the LP oxygen-supply hose (5770HM1) (18) and the support is at 45 degrees, plus or minus 15 degrees.
(g) Make sure that clearance X between the LP oxygen-supply hose (5770HM1) (18) and the hose (31) is equal or more than 12.7 mm (0.50 in.).
(2) Installation of the LP oxygen-supply hose (5763HM1) (5):
(a) Connect one end of the LP oxygen-supply hose (5763HM1) (5) as follows:
1 Remove the BAG - VINYL from the disconnected port (8) of the pipe (10).
2 Remove the CAP - BLANKING, APPROVED FOR USE WITH OXYGEN from the disconnected port (8) of the pipe (10).
3 Install a new AIPC 35-12-81-09-010 RING FOR FLARED TUBE (7) on the disconnect port (8) of the pipe (10).
4 Connect the new AIPC 35-12-81-09-040 LP OXYGEN-SUPPLY-HOSE (5) (5763HM1) on the pipe (10).
5 TORQUE the nut (6) to the port (8) to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(b) Connect the other end of the LP oxygen-supply hose (5763HM1) (5) as follows:
1 Remove the BAG - VINYL from the disconnected port (2) of the pressure regulator/transmitter (4HT) (1).
2 Remove the CAP - BLANKING, APPROVED FOR USE WITH OXYGEN from the disconnected port (2) of the pressure regulator/transmitter (4HT) (1).
3 Install a new AIPC 35-12-81-09-010 RING FOR FLARED TUBE (3) on the disconnected port (2) of the pressure regulator/transmitter (4HT) (1).
4 Connect the new LP oxygen-supply-hose (5763HM1) (5) on the pressure regulator/transmitter (4HT) (1).
5 TORQUE the nut (4) to the pressure regulator/transmitter (4HT) (1) to between 2.03 and 1.47 m.daN (14.97 and 10.84 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(3) Installation of the LP oxygen-supply hose (5763HM2) (26):
(a) Connect one end of the LP oxygen-supply hose (5763HM2) (26) as follows:
1 Remove the BAG - VINYL from the disconnected port (23).
2 Remove the CAP - BLANKING, APPROVED FOR USE WITH OXYGEN from the disconnected port (23).
3 Install a new AIPC 35-12-81-11-030 RING FOR FLARED TUBE (24) on the disconnected port (23).
4 Connect the new AIPC 35-12-81-11-040 LP OXYGEN-SUPPLY-HOSE (26) (5763HM2) on the port (23).
5 TORQUE the nut (25) to the port (23) to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(b) Connect the other end of the LP oxygen-supply hose (5763HM2) (26) as follows:
1 Remove the BAG - VINYL from the disconnected port (29) of the pressure regulator/transmitter (4HT2) (30).
2 Remove the CAP - BLANKING, APPROVED FOR USE WITH OXYGEN from the disconnected port (29) of the pressure regulator/transmitter (4HT2) (30).
3 Install a new AIPC 35-12-81-11-030 RING FOR FLARED TUBE (28) on the disconnected port (29) of the pressure regulator/transmitter (4HT2) (30).
4 Connect the new LP oxygen-supply-hose (5763HM2) (26) on the pressure regulator/transmitter (4HT2) (30).
5 TORQUE the nut (27) to the pressure regulator/transmitter (4HT2) (30) to between 2.03 and 1.47 m.daN (14.97 and 10.84 lbf.ft )

.
6 Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).

Subtask 35-13-00-790-050-B ** ON A/C NOT FOR ALL

F. Leak Test
(1) Apply the solution Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the mechanical connections.
(2) Turn the manual shutoff valves:

CAUTION: WHEN YOU OPEN THE MANUAL SHUTOFF VALVE ON THE CREW OXYGEN-STORAGE CYLINDER, MAKE SURE THAT:

YOU TURN IT VERY SLOWLY
YOU TURN IT UNTIL IT IS FULLY OPEN.

IF YOU TURN THE MANUAL SHUTOFF VALVE TOO QUICKLY, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT. IF THE MANUAL SHUTOFF VALVE IS NOT FULLY OPEN, THE OXYGEN PRESSURE DATA CAN BE INCORRECT.

(a) Slowly and fully open in one step, the manual shutoff valves of the two crew oxygen-storage cylinders (5750HM1, 5750HM2).
(3) Examine each connection to make sure that there are no leaks.
(4) Remove the solution Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) from the mechanical connections with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .

5. Close-up
Subtask 35-13-00-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	OXYGEN/CREW/OXY/SPLY	1HT	HA01

Subtask 35-13-00-860-051-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) In the avionics compartment, on the manual shutoff valve of the crew oxygen-storage cylinder (5750HM):

Remove the WARNING NOTICE(S).

(3) In the cockpit, on the CREW SUPPLY pushbutton switch:

Remove the WARNING NOTICE(S).

(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 35-13-00-860-051-B ** ON A/C NOT FOR ALL

Remove the WARNING NOTICE(S).

(3) In the cockpit, on the CREW SUPPLY pushbutton switch:

Remove the WARNING NOTICE(S).

(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 35-13-00-410-050-A

C. Close Access
(1) Close access door 812 (Ref. AMM TASK 52-41-00-410-002).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:04:25 UTC