Removal of the Oxygen Filling Port

TASK 35-11-42-000-001-A
Removal of the Oxygen Filling Port

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.

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

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: 123
ZONE: 125
FIN: 5769HM ** ON A/C NOT FOR ALL
FIN: 5769HM1 ** ON A/C NOT FOR ALL
FIN: 5769HM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	BAG - VINYL, SEALED
No specific	AR	CAP - BLANKING
No specific	AR	CAP - BLANKING, APPROVED FOR USE WITH OXYGEN
No specific	AR	PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	AR	WRENCH - STANDARD

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
123	NOSE GEAR WELL
125	LATERAL AVIONIC COMPARTMENT
812

C. Referenced Information

REFERENCE	DESIGNATION
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
Oxygen Filling Port ** ON A/C NOT FOR ALL
Oxygen Filling Port ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 35-11-42-861-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Energize the ground service network (Ref. AMM TASK 24-42-00-861-001).
(3) In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:

Make sure that the CREW SUPPLY pushbutton switch is released (OFF legend on).
Put a WARNING NOTICE(S) in position to tell persons not to operate the oxygen system.

Subtask 35-11-42-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at access door 812.
(2) Open access door 812.
(3) Close the valve of the cylinder (5750HM).

Subtask 35-11-42-010-051-B ** ON A/C NOT FOR ALL

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

Subtask 35-11-42-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	OXYGEN/CREW/OXY/SPLY	1HT	HA01

Subtask 35-11-42-860-055-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) On the crew oxygen-storage cylinder 5750HM1:
(a) Fully close the manual shutoff valve of the crew oxygen-storage cylinder 5750HM1.
(b) Put a WARNING NOTICE(S) in position to tell persons not to open the manual shutoff valve of the crew oxygen-storage cylinder 5750HM1.
(2) On the crew oxygen-storage cylinder 5750HM2:
(a) Fully close the manual shutoff valve of the crew oxygen-storage cylinder 5750HM2.
(b) Put a WARNING NOTICE(S) in position to tell persons not to open the manual shutoff valve of the crew oxygen-storage cylinder 5750HM2.

4. Procedure
Subtask 35-11-42-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the Oxygen Filling Port (5769HM)
(1) Disconnect the tube (5) and discard the sleeve (4).
(2) Put a CAP - BLANKING on the disconnected end of the tube (5).
(3) Remove the nuts (3) and the screws (1).
(4) Remove the oxygen filling port (2).

Subtask 35-11-42-020-053-B ** ON A/C NOT FOR ALL

A. Removal of the Oxygen Filling Port
(1) Release the tube (6) as follows:

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.

(a) Hold the oxygen filling port (3) with a WRENCH - STANDARD and loosen the coupling nut of the tube (6). Do only two full turns of the coupling nut of the tube (6) to release the torque.

NOTE: Do not disconnect the tube (6) from the oxygen filling port (3) at this time.

(2) Remove the plug assembly (1) as follows:
(a) Make sure that you do not cause a blockage of the two vent holes of the nut on the plug assembly (1).
(b) Loosen and slowly remove the nut of the plug assembly (1) from the oxygen filling port (3).
(c) Put a PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN on the nut of the disconnected plug assembly (1).
(d) Put the plug assembly (1) in a BAG - VINYL, SEALED.
(e) Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the inlet side of the oxygen filling port (3).
(3) Remove the nuts (5) and screws (2) from the oxygen filling port (3).
(4) Remove the oxygen filling port (3) as follows:

(a) Hold the oxygen filling port (3) with a WRENCH - STANDARD and loosen the coupling nut of the tube (6).
(b) Disconnect the tube (6) from the oxygen filling port (3).
(c) Remove the oxygen filling port (3) from the support plate (4).
(d) Put a PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected end of the tube (6).
(e) Put the disconnected end of the tube (6) in a BAG - VINYL, SEALED.
(f) Put a CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the outlet side of the oxygen filling port (3).
(5) Put the oxygen filling port (3) in a BAG - VINYL, SEALED.

[Rev.10 from 2021] 2026.04.05 10:36:19 UTC