W DOC AIRBUS | TSM A320F

Fast Loss of Crew Oxygen with Overboard Discharge Indicator Yellow

TASK 35-10-00-810-814-A
Fast Loss of Crew Oxygen with Overboard Discharge Indicator Yellow

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.
1. Possible Causes
  • XMTR/PRESS REG-OXY [4HT]
  • PRESS.TRANSM.REGULATO [4HT2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 12-14-35-600-001
Servicing of the Oxygen-Replenishing
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002
De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 31-60-00-860-002
EIS Stop Procedure
AMM 35-00-00-860-001
Special Precautions When Working on a Gaseous Oxygen System
AMM 35-13-15-000-001
Removal of the Oxygen Pressure Regulator/Transmitter
AMM 35-13-15-000-802
Removal of the Oxygen Pressure Regulator/Transmitters
AMM 35-13-15-400-001
Installation of the Oxygen Pressure Regulator/Transmitter
AMM 35-13-15-400-802
Installation of the Oxygen Pressure Regulator/Transmitters
AMM 35-13-22-920-001
Replacement of the Overboard Discharge Indicator
AMM 35-13-22-920-802
Replacement of the Overboard Discharge Indicators
3. Fault Confirmation
Subtask 35-10-00-860-062-A
A. Job Set Up
   (1) Aircraft Maintenance Configuration
     (a) Obey the special precautions when you do work on a gaseous oxygen system AMM 35-00-00-860-001.
     (b) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
     (c) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
     (d) 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).
Subtask 35-10-00-865-054-A
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUOXYGEN/CREW/OXY/SPLY1HTHA01
Subtask 35-10-00-700-060-A ** ON A/C NOT FOR ALL
C. Test
   (1) On the ECAM control panel:
  • Push the DOOR key to get the DOOR/OXY page.
   (2) On the ECAM control panel, on the DOOR/OXY page, make sure that the oxygen pressure indication shows a fast loss of the crew oxygen pressure.
   (3) Get access to the overboard-discharge indicator 5756HM from the outside of the aircraft.
     (a) Make sure that the overboard-discharge indicator 5756HM is yellow.
Subtask 35-10-00-700-060-B ** ON A/C NOT FOR ALL
C. Test
   (1) On the ECAM control panel:
  • Push the DOOR key to get the DOOR/OXY page.
   (2) On the ECAM control panel, on the DOOR/OXY page, make sure that:
  • A minimum of one of the two oxygen pressure indications shows a fast loss of the crew oxygen pressure.
NOTE: The pressure indication given on the left side of the lower ECAM Display Unit (DU) is for the Captain and the Third Occupant with oxygen cylinder 5750HM1.
NOTE: The pressure indication given on the right side of the lower ECAM DU is for the First Officer and the Fourth Occupant with oxygen cylinder 5750HM2.
   (3) For the oxygen pressure indication on the left side of the DOOR/OXY page:
     (a) Get access to the overboard-discharge indicator 5756HM1 from the outside of the aircraft.
     (b) Make sure that the overboard-discharge indicator 5756HM1 is yellow.
   (4) For the oxygen pressure indication on the right side of the DOOR/OXY page:
     (a) Get access to the overboard-discharge indicator 5756HM2 from the outside of the aircraft.
     (b) Make sure that the overboard-discharge indicator 5756HM2 is yellow.
4. Fault Isolation
Subtask 35-10-00-810-063-B ** ON A/C NOT FOR ALL
A. If the oxygen pressure indication of the crew oxygen-storage-cylinder 5750HM decreases quickly:
   (1) If necessary:
     (a) Fill the crew oxygen-storage-cylinder 5750HM AMM 12-14-35-600-001.
Subtask 35-10-00-810-063-D ** ON A/C NOT FOR ALL
A. If the oxygen pressure indication of the crew oxygen-storage-cylinder 5750HM1 (on the left side of the lower ECAM DU) decreases quickly:
   (1) If necessary:
     (a) Fill the crew oxygen-storage-cylinder 5750HM1 AMM 12-14-35-600-001.
Subtask 35-10-00-810-089-E ** ON A/C NOT FOR ALL
B. If the oxygen pressure indication of the crew oxygen-storage-cylinder 5750HM2 (on the right side of the lower ECAM DU) decreases quickly:
   (1) If necessary:
     (a) Fill the crew oxygen-storage-cylinder 5750HM2 AMM 12-14-35-600-001.
Subtask 35-10-00-700-061-A ** ON A/C NOT FOR ALL
C. Test
   (1) On the ECAM control panel, on the DOOR/OXY page:
  • Make sure that the oxygen pressure indication does not show a fast loss of the crew oxygen pressure.
   (2) Get access to the overboard-discharge indicator 5756HM from the outside of the aircraft.
     (a) Make sure that the overboard-discharge indicators 5756HM is not yellow.
Subtask 35-10-00-700-061-B ** ON A/C NOT FOR ALL
C. Test
   (1) On the ECAM control panel, on the DOOR/OXY page:
  • Make sure that the two oxygen-pressure indications do not show a fast loss of the crew oxygen pressure.
   (2) Get access to the overboard-discharge indicators 5756HM1 and 5756HM2 from the outside of the aircraft.
     (a) Make sure that the two overboard-discharge indicators 5756HM1 and 5756HM2 are not yellow.
5. Close-up
Subtask 35-10-00-860-063-A
A. Put the aircraft back to its initial configuration.
   (1) 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).
   (2) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
AMM 31-60-00-860-002.
   (3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:33:35 UTC
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