Replacement of the Overboard Discharge Indicator

TASK 35-13-22-920-001-A
Replacement of the Overboard Discharge Indicator

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.

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	1	AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY
No specific	AR	BAG - VINYL
No specific	AR	PLUG - BLANKING
No specific	Torque wrench: range to between 2.033 and 1.468 m.daN (14.99 and 10.83 lbf.ft )
No specific	Torque wrench: range to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
812

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	RING	AIPC 35-12-01-01-010
6	SLEEVE	AIPC 35-12-01-01-010
9	KIT	AIPC 35-13-22-01-010

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 35-00-00-860-001-A	Special Precautions When Working on a Gaseous Oxygen System
Overboard Discharge Indicator

3. Job Set-up
Subtask 35-13-22-010-051-A ** ON A/C NOT FOR ALL

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) Put the ACCESS PLATFORM 2M (6 FT) in position at access door 812.
(3) Open access door 812.

Subtask 35-13-22-941-051-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Close the manual shutoff valve of the oxygen cylinder (5750HM).

4. Procedure
Subtask 35-13-22-020-050-A ** ON A/C NOT FOR ALL

A. Replacement of the Overboard Discharge Indicator (5756HM)

(1) Disconnect the LP oxygen overpressure-hose (5762HM) from the oxygen pressure regulator/transmitter (1).
(a) Disconnect the coupling (4) and discard the sleeve (3).
(b) Put a PLUG - BLANKING on the coupling (2) of the oxygen pressure regulator/transmitter (1).
(c) Put a BAG - VINYL on the coupling (4) of the hose.
(2) Disconnect the HP oxygen overpressure hose 5761HM from the valve (8) of the oxygen cylinder:
(a) Disconnect the coupling (5) and discard the sleeve (6).
(b) Put a blanking plug on the coupling (7) of the valve of the oxygen cylinder.
(c) Put a sealed vinyl bag on the coupling (5) of the hose.
(3) Flush internally with air the hoses connected to the overboard discharge indicator:
(a) Use a AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY that is filtered and without oil.
(b) Remove the couplings (4) and (5) from the sealed vinyl bags.
(c) Flush the hoses internally with air two or three times (flush them one after the other each time to make sure that there are no unwanted objects in the system).
(d) Put blanking plugs on the couplings (4) and (5).
(e) Put the couplings (4) and (5) in sealed vinyl bags.
(4) Clean the body of the overboard discharge indicator:
(a) Remove the yellow reflecting washer (9) from the body of the indicator (10) and discard it.

CAUTION : MAKE SURE THAT NO UNWANTED PARTICLES GO INTO THE OXYGEN SYSTEM.

(b) Clean the body of the indicator with a clean lint-free cloth.
(5) Install the disc of the overboard discharge indicator:
(a) Use the AIPC 35-13-22-01-010 KIT (9):

Open the bag with a plastic point,
Carefully remove the components of the kit,
Discard the bag.

(b) Install the new disc with the green reflecting surface on the external side.
(c) Install the retainer ring with the rounded edges on the external side.
(6) Connect the LP oxygen overpressure-hose (5762HM) to the oxygen pressure regulator/transmitter (1):
(a) Remove the sealed vinyl bag and the blanking plug from the coupling (4) of the hose.
(b) Install a new AIPC 35-12-01-01-010 RING (3) on the coupling (4).
(c) Remove the blanking plug from the coupling (2) of the oxygen pressure regulator/transmitter (1).
(d) Install the coupling (4) of the hose on the coupling (2) of the oxygen pressure regulator/transmitter (1).
(e) TORQUE the coupling (4) to between 2.033 and 1.468 m.daN (14.99 and 10.83 lbf.ft )

.
(f) Identify the tightened union nuts with a red line (Ref. AMM TASK 20-23-22-910-001).
(7) Connect the HP oxygen overpressure-hose (5761HM) to the valve (8) of the oxygen cylinder:
(a) Remove the sealed vinyl bag and the blanking plug from the coupling (5) of the hose.
(b) Install a new AIPC 35-12-01-01-010 SLEEVE (6) on the coupling (5).
(c) Remove the blanking plug from the coupling (7) of the valve of the oxygen cylinder.
(d) Install the coupling (5) of the hose on the coupling (7) of the valve of the oxygen cylinder.
(e) TORQUE the coupling (5) to between 2.7 and 1.9 m.daN (19.91 and 14.01 lbf.ft )

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

5. Close-up
Subtask 35-13-22-942-052-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Open the manual shutoff valve of the oxygen cylinder:
(a) Very slowly open the manual shutoff valve of the oxygen cylinder (5750HM) 3.5 to 4 turns.
(b) Let the pressure become stable.
This occurs after approximately 90 seconds.
(c) Fully open the manual shutoff valve.

Subtask 35-13-22-942-052-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Turn the manual shutoff valve of the oxygen cylinder (5750HM) very slowly until it is fully open.

Subtask 35-13-22-410-051-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 812.
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:04:38 UTC