Removal of the Oxygen Pressure Regulator/Transmitter

TASK 35-13-15-000-001-A
Removal of the Oxygen Pressure Regulator/Transmitter

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: 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
ZONE: 210
FIN: 4HT ** 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
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	Torque wrench: range to between 1.581 and 1.129 m.daN (139.91 and 99.91 lbf.in )
No specific	Torque wrench: range to between 4.520 and 3.955 m.daN (33.33 and 29.17 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
125	LATERAL AVIONIC COMPARTMENT
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
812

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-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 35-00-00-860-001-A	Special Precautions When Working on a Gaseous Oxygen System
TASK 35-10-00-870-801-A	Depressurization of the Crew Oxygen System (Manual Shutoff Valve(s) of the Crew Oxygen-Storage Cylinder(s) is (are) Closed)
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
Oxygen Pressure Regulator/Transmitter ** ON A/C NOT FOR ALL
Oxygen Pressure Regulator/Transmitter ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 35-13-15-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

WARNING: WHEN YOU DO WORK ON THE GASEOUS OXYGEN SYSTEM, MAKE SURE THAT YOU OBEY ALL THE APPLICABLE SAFETY PRECAUTIONS. IF YOU DO NOT OBEY THESE PRECAUTIONS, INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT CAN OCCUR.

(1) Obey the special precautions when you do work on a gaseous oxygen system (Ref. AMM TASK 35-00-00-860-001).
(2) Fully close the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(3) Put a WARNING NOTICE(S) in position to tell persons not to open the manual shutoff valve of the crew oxygen-storage cylinder (5750HM).
(4) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 35-13-15-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the 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 35-13-15-614-050-A ** ON A/C NOT FOR ALL

C. Bleeding of the Crew Oxygen System
(1) Release the pressure from the crew oxygen system (Ref. AMM TASK 35-10-00-870-801).
(2) In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:

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

Subtask 35-13-15-865-050-A ** ON A/C NOT FOR ALL

D. 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

4. Procedure
Subtask 35-13-15-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the Oxygen Pressure Regulator/Transmitter

NOTE: The disconnected line ends must not stay open without protections for more than six minutes. Thus, install the vinyl bags and the blanking plugs on the disconnected line ends immediately after you disconnect them.

(1) Disconnect the electrical connector (4) from the electrical receptacle of the oxygen pressure regulator/transmitter (4HT) (3).
(2) Put a CAP - BLANKING on the electrical connector (4).
(3) Put a CAP - BLANKING on the electrical receptacle of the oxygen pressure regulator/transmitter (4HT) (3).
(4) Disconnect the oxygen filling hose (1) as follows:
(a) Disconnect the oxygen filling hose (1) from the filling port of the oxygen pressure regulator/transmitter (4HT) (3).
(b) Remove and discard the ring (2).
(c) Put an PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN and a BAG - VINYL on the disconnected end of the oxygen filling hose (1).
(d) Put the cap on the filling port of the oxygen pressure regulator/transmitter (4HT) (3).

NOTE: The cap of the filling port is attached to the oxygen pressure regulator/transmitter (4HT) (3) with a lanyard.

(e) TORQUE the cap to between 1.581 and 1.129 m.daN (139.91 and 99.91 lbf.in )

.
(5) Disconnect the LP oxygen overpressure hose (5762HM) (6) as follows:
(a) Disconnect the LP oxygen overpressure hose (5762HM) (6) from the overpressure port of the oxygen pressure regulator/transmitter (4HT) (3).
(b) Remove and discard the ring (5).
(c) Put an PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN and a BAG - VINYL on the disconnected end of the LP oxygen overpressure hose (5762HM) (6).
(d) Put an CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected overpressure port of the oxygen pressure regulator/transmitter (4HT) (3).
(6) Disconnect the oxygen supply hose (5763HM) (7) as follows:
(a) Disconnect the oxygen supply hose (5763HM) (7) from the LP outlet port of the oxygen pressure regulator/transmitter (4HT) (3).
(b) Remove and discard the ring (8).
(c) Put an PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN and a BAG - VINYL on the disconnected end of the oxygen supply hose (5763HM) (7).
(d) Put an CAP - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected LP outlet port of the oxygen pressure regulator/transmitter (4HT) (3).
(7) Remove the oxygen pressure regulator/transmitter (4HT) (3) as follows:
(a) Loosen the nut (9) and release the inlet port of the oxygen pressure regulator/transmitter (4HT) (3) from the cylinder valve outlet-port (11).
(b) Put an PLUG - BLANKING, APPROVED FOR USE WITH OXYGEN on the disconnected inlet port of the oxygen pressure regulator/transmitter (4HT) (3).
(c) Put the oxygen pressure regulator/transmitter (4HT) (3) in a BAG - VINYL, SEALED.
(8) Remove the sealing cap (10) from the bag (13) attached to the valve (12).
(9) Put the sealing cap (10) on the cylinder valve outlet-port (11).
(10) TORQUE the sealing cap (10) to between 4.520 and 3.955 m.daN (33.33 and 29.17 lbf.ft )

[Rev.10 from 2021] 2026.04.01 01:04:31 UTC