W DOC AIRBUS | AMM A320F

Functional Check of Low Pressure Switch

TASK 35-12-00-710-001-A
Functional Check of Low Pressure Switch

ZONE: 210
1. Reason for the Job
Refer to the MPD TASK: 351351-01
FUNCTIONAL CHECK OF LOW PRESSURE SWITCH
To do a check of the low-pressure oxygen-supply solenoid-valve (in closing mode) and the low pressure indicator.
2. Job Set-up Information
 A. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
 B. 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 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 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TSM 35-10-00-810-801
Loss of the Oxygen Pressure Indication on the DOOR/OXY Page
TSM 35-10-00-810-811
Crew Oxygen Pressure Indication with Amber Pressure Value and Amber Half Box on the DOOR/OXY Page
TSM 35-10-00-810-820
REGUL LO PR Indication with no Oxygen Pressure Value on the DOOR/OXY Page
TSM 35-10-00-810-828
Loss of the REGUL LO PR Indication
3. Job Set-up
Subtask 35-12-00-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
   (2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
Subtask 35-12-00-865-050-A ** ON A/C NOT FOR ALL
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUOXYGEN/CREW/OXY/SPLY1HTHA01
4. Procedure
Subtask 35-12-00-710-050-C ** ON A/C NOT FOR ALL
A. Functional Check
   (1) On the center pedestal, on the lower ECAM display unit, the DOOR/OXY page is shown automatically:
NOTE: If the DOOR/OXY page is not shown, the aircraft system is unserviceable.
     (a) If the DOOR/OXY page is not shown:
  • On the center pedestal, on the ECAM control panel, push the DOOR key (the DOOR/OXY page comes into view).
   (2) Read the oxygen pressure indication on the DOOR/OXY page:
NOTE: If the pressure is less than 1500 psi (103.42 bar), an amber half-box (advisory) is shown only for information.
     (a) If the HP oxygen pressure is less than 400 psi (27.58 bar), do not do the test that follows but do the troubleshooting procedure (Ref. AMM D/O 35-10-00-81).
     (b) If the HP oxygen pressure is not available, do not do the test that follows (the amber crosses show that the oxygen pressure information is not available: XXXXPSI) but do the troubleshooting procedure (Ref. AMM TASK 35-10-00-810-801).
   (3) Do the test that follows:
ACTION
RESULT
1.On panel 21VU:
  • Push the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend goes off.
On the DOOR/OXY page:
  • The OXY message is shown in white.
  • The oxygen HP indication stays green.
2.On panel 21VU:
  • Release the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend comes on.
On the DOOR/OXY page:
  • The OXY message changes from white to amber.
  • The oxygen HP indication stays green.
3.In the cockpit, on one of the oxygen-mask stowage boxes:
  • Push the PRESS TO TEST AND RESET control slide many times.
On the DOOR/OXY page:
  • The REGUL LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The oxygen HP indication stays green.
4.On panel 21VU:
  • Push the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend goes off.
On the DOOR/OXY page:
  • The REGUL LO PR message goes out of view.
  • The OXY message changes from amber to white.
  • The oxygen HP indication stays green.
5.On panel 21VU:
  • Release the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend comes on.
Subtask 35-12-00-710-050-G ** ON A/C NOT FOR ALL
A. Functional Check
   (1) On the center pedestal, on the lower ECAM display unit, the DOOR/OXY page is shown automatically:
     (a) If the DOOR/OXY page is not shown, the aircraft system is unserviceable.
     (b) If the DOOR/OXY page is not shown:
  • On the center pedestal, on the lower ECAM DU, push the DOOR key (the DOOR/OXY page comes into view).
   (2) Read the oxygen pressure indication on the DOOR/OXY page:
NOTE: If the pressure is less than 1500 psi (103.42 bar), an amber half-box (advisory) is shown only for information.
     (a) If the HP oxygen pressure is less than 400 psi (27.58 bar), do not do the test that follows but do the troubleshooting procedure TSM 35-10-00-810-811.
     (b) If the HP oxygen pressure is not available, do not do the test that follows (the amber crosses show that the oxygen pressure information is not available: XXXXPSI) but do the troubleshooting procedure TSM 35-10-00-810-801 or TSM 35-10-00-810-820.
   (3) Do the test that follows:
ACTION
RESULT
1.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the CREW SUPPLY pushbutton switch.
The OFF legend goes off.
On the DOOR/OXY page:
  • The OXY message is shown in green.
  • The oxygen HP indication stays green.
2.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the CREW SUPPLY pushbutton switch.
The OFF legend comes on.
On the DOOR/OXY page:
  • The OXY message changes from green to amber.
  • The oxygen HP indication stays green.
3.In the cockpit, on one of the oxygen-mask stowage boxes:
  • Push and hold the PRESS TO TEST AND RESET control lever.
  • At the same time, push and hold the PRESS TO TEST/EMERGENCY knob on the mask regulator.
  • Keep the PRESS TO TEST/EMERGENCY knob pushed until you do not hear the volume of the sound of the oxygen flow.
On the DOOR/OXY page:
  • The REGUL LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The oxygen HP indication stays green.

If the REGUL LO PR indication does not come into view on the DOOR/OXY page and/or if the volume of the sound of the oxygen flow does not stop:
4.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the CREW SUPPLY pushbutton switch.
The OFF legend goes off.
On the DOOR/OXY page:
  • The REGUL LO PR message goes out of view.
  • The OXY message changes from amber to green.
  • The oxygen HP indication stays green.
5.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the CREW SUPPLY pushbutton switch.
The OFF legend comes on.
Subtask 35-12-00-710-050-H ** ON A/C NOT FOR ALL
A. Functional Check
   (1) On the center pedestal, on the lower ECAM display unit, the DOOR/OXY page is shown automatically:
NOTE: If the DOOR/OXY page is not shown, the aircraft system is unserviceable.
     (a) If the DOOR/OXY page is not shown:
  • On the center pedestal, on the ECAM control panel, push the DOOR key (the DOOR/OXY page comes into view).
   (2) Read the oxygen pressure indication on the DOOR/OXY page:
NOTE: If the pressure in one or two oxygen cylinder(s) is less than 800 psi (55.16 bar), an amber half-box (advisory) is shown only for information.
     (a) If the HP oxygen pressure is less than 200 psi (13.79 bar), do not do the test that follows but do the troubleshooting procedure (Ref. AMM D/O 35-10-00-81).
     (b) If the HP oxygen pressure is not available, do not do the test that follows (the amber crosses show that the oxygen pressure information is not available: XXXXPSI) but do the troubleshooting procedure (Ref. AMM TASK 35-10-00-810-801).
   (3) Do the test that follows:
ACTION
RESULT
1.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
On the DOOR/OXY page:
  • The CKPT OXY message is shown in white.
  • The two HP oxygen indications stay green.
2.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
On the DOOR/OXY page:
  • The CKPT OXY message changes from white to amber.
  • The two HP oxygen indications stay green.
3.In the cockpit, on one of the oxygen-mask stowage boxes:
  • 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.

When the flow rate indicator is black and you do not hear the sound of the oxygen flow:
  • Release the PRESS TO TEST/EMERGENCY knob.
  • Release the PRESS TO TEST AND RESET control button.
On the DOOR/OXY page:
  • The REGUL 1 LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The two HP oxygen indications stay green.
4.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
On the DOOR/OXY page:
  • The REGUL 1 LO PR message goes out of view.
  • The CKPT OXY message changes from amber to white.
  • The two HP oxygen indications stay green.
5.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
On the DOOR/OXY page:
  • The CKPT OXY message changes from white to amber.
  • The two HP oxygen indications stay green.
6.In the cockpit, on one of the oxygen-mask stowage boxes:
  • 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.

When the flow rate indicator is black and you do not hear the sound of the oxygen flow:
  • Release the PRESS TO TEST/EMERGENCY knob.
  • Release the PRESS TO TEST AND RESET control button.
On the DOOR/OXY page:
  • The REGUL 2 LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The two HP oxygen indications stay green.
7.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the CREW SUPPLY pushbutton switch (the OFF legend goes off).
On the DOOR/OXY page:
  • The REGUL 2 LO PR message goes out of view.
  • The CKPT OXY message changes from amber to white.
  • The two HP oxygen indications stay green.
8.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the CREW SUPPLY pushbutton switch (the OFF legend comes on).
On the DOOR/OXY page:
  • The CKPT OXY message changes from white to amber.
  • The two HP oxygen indications stay green.
9.In the cockpit, on the captain and first-officer oxygen-mask stowage-boxes:
  • 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.
When the flow rate indicator is black and you do not hear the sound of the oxygen flow:
  • Release the PRESS TO TEST/EMERGENCY knob.
  • Release the PRESS TO TEST AND RESET control button.
Make sure that the PRESS TO TEST/EMERGENCY knob is not in the EMERGENCY position.
On the DOOR/OXY page:
  • The REGUL 1+2 LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The two HP oxygen indications stay green.
10.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).
On the DOOR/OXY page:
  • The REGUL 1+2 LO PR message goes out of view.
  • The CKPT OXY message changes from amber to white.
  • The two HP oxygen indications stay green.
11.In the cockpit, on the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the CREW SUPPLY pushbutton switch.
  • The OFF legend comes on.
Subtask 35-12-00-710-050-I ** ON A/C NOT FOR ALL
A. Functional Check
   (1) On the center pedestal, on the lower ECAM display unit, the DOOR/OXY page is shown automatically:
NOTE: If the DOOR/OXY page is not shown, the aircraft system is unserviceable.
     (a) If the DOOR/OXY page is not shown:
  • On the center pedestal, on the ECAM control panel, push the DOOR key (the DOOR/OXY page comes into view).
   (2) Read the oxygen pressure indication on the DOOR/OXY page:
NOTE: If the pressure is less than 1000 psi (68.95 bar), an amber half-box (advisory) is shown only for information.
     (a) If the HP oxygen pressure is less than 400 psi (27.58 bar), do not do the test that follows but do the troubleshooting procedure (Ref. AMM D/O 35-10-00-81).
     (b) If the HP oxygen pressure is not available, do not do the test that follows (the amber crosses show that the oxygen pressure information is not available: XXXXPSI) but do the troubleshooting procedure (Ref. AMM TASK 35-10-00-810-801).
   (3) Do the test that follows:
ACTION
RESULT
1.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the OXYGEN/CREW SUPPLY pushbutton switch.
On the OXYGEN/CREW SUPPLY pushbutton switch:
  • The OFF legend goes off.
    On the DOOR/OXY page:
  • The OXY message is shown in green.
  • The oxygen HP indication stays green.
2.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the OXYGEN/CREW SUPPLY pushbutton switch.
On the OXYGEN/CREW SUPPLY pushbutton switch:
  • The OFF legend comes on.
    On the DOOR/OXY page:
  • The OXY message changes from green to amber.
  • The oxygen HP indication stays green.
3.In the cockpit, on one of the oxygen-mask stowage boxes:
  • Push the PRESS TO TEST AND RESET control slide many times.
On the DOOR/OXY page:
  • The REGUL LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The oxygen HP indication stays green.
4.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Push the OXYGEN/CREW SUPPLY pushbutton switch.
On the OXYGEN/CREW SUPPLY pushbutton switch:
  • The OFF legend goes off.
    On the DOOR/OXY page:
  • The REGUL LO PR message goes out of view.
  • The OXY message changes from amber to green.
  • The oxygen HP indication stays green.
5.On the OXYGEN section of overhead control and indicating panel 21VU:
  • Release the OXYGEN/CREW SUPPLY pushbutton switch.
On the OXYGEN/CREW SUPPLY pushbutton switch:
  • The OFF legend comes on.
Subtask 35-12-00-710-050-J ** ON A/C NOT FOR ALL
A. Functional Check
   (1) On the center pedestal, on the lower ECAM display unit, the DOOR/OXY page is shown automatically:
NOTE: If the DOOR/OXY page is not shown, the aircraft system is unserviceable.
     (a) If the DOOR/OXY page is not shown:
  • On the center pedestal, on the ECAM control panel, push the DOOR key (the DOOR/OXY page comes into view).
   (2) Read the oxygen pressure indication on the DOOR/OXY page:
NOTE: If the pressure is less than 1000 psi (68.95 bar), an amber half-box (advisory) is shown only for information.
     (a) If the HP oxygen pressure is less than 400 psi (27.58 bar), do not do the test that follows but do the troubleshooting procedure (Ref. AMM D/O 35-10-00-81).
     (b) If the HP oxygen pressure is not available, do not do the test that follows (the amber crosses show that the oxygen pressure information is not available: XXXXPSI) but do the troubleshooting procedure (Ref. AMM TASK 35-10-00-810-801).
   (3) Do the test that follows:
ACTION
RESULT
1.On panel 21VU:
  • Push the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend goes off.
On the DOOR/OXY page:
  • The OXY message is shown in white.
  • The oxygen HP indication stays green.
2.On panel 21VU:
  • Release the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend comes on.
On the DOOR/OXY page:
  • The OXY message changes from white to amber.
  • The oxygen HP indication stays green.
3.In the cockpit, on one of the oxygen-mask stowage boxes:
  • Push the PRESS TO TEST AND RESET control slide many times.
On the DOOR/OXY page:
  • The REGUL LO PR message comes into view in amber.
  • The OXY message stays amber.
  • The oxygen HP indication stays green.
4.On panel 21VU:
  • Push the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend goes off.
On the DOOR/OXY page:
  • The REGUL LO PR message goes out of view.
  • The OXY message changes from amber to white.
  • The oxygen HP indication stays green.
5.On panel 21VU:
  • Release the OXYGEN/CREW SUPPLY pushbutton switch.
  • The OFF legend comes on.
5. Close-up
Subtask 35-12-00-860-051-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
   (2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.01 01:04:07 UTC
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