Crew Oxygen Mask Dirty

TASK 35-10-00-810-807-A
Crew Oxygen Mask Dirty

1. Possible Causes

MASK-FULL FACE/Q.D. OXY, CAPT [5759HM]
MASK-FULL FACE/Q.D. OXY, F/O [5758HM]
MASK-FULL FACE/Q.D. OXY, 3RD OCCPNT [5757HM]
MASK-FULL FACE/Q.D. OXY, 4TH OCCPNT [5760HM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 35-12-41-100-001	Cleaning of Oxygen Masks

3. Fault Confirmation
Subtask 35-10-00-860-052-A

A. Job Set Up
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(b) Make sure that this(these) circuit breaker(s) is(are) closed:
1HT.
(c) On the panel 21VU push the OXYGEN/CREW SUPPLY pushbutton switch (the OFF legend goes off).

Subtask 35-10-00-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	OXYGEN/CREW/OXY/SPLY	1HT	HA01

Subtask 35-10-00-700-053-A

C. Test
(1) Remove the oxygen mask from the flight crew oxygen box.
(2) Make sure that the mask is dirty.

4. Fault Isolation
Subtask 35-10-00-810-056-B

A. If during the test:
(1) The Captain Oxygen mask is dirty:

clean the MASK-FULL FACE/Q.D. OXY, CAPT [5759HM] AMM 35-12-41-100-001.

(2) The First Officer mask is dirty:

clean the MASK-FULL FACE/Q.D. OXY, F/O [5758HM] AMM 35-12-41-100-001.

(3) The Third Occupant oxygen mask is dirty:

clean the MASK-FULL FACE/Q.D. OXY, 3RD OCCPNT [5757HM] AMM 35-12-41-100-001.

(4) The Fourth Occupant oxygen mask is dirty:

clean the MASK-FULL FACE/Q.D. OXY, 4TH OCCPNT [5760HM] AMM 35-12-41-100-001.

5. Close-up
Subtask 35-10-00-860-056-A

A. Put the aircraft back to its initial configuration.
(1) After you have examined the last oxygen mask, release the OXYGEN/CREW SUPPLY pushbutton switch (the OFF legend comes on).
(2) De-energize the aircraft electrical circuits

[Rev.8 from Aug 2018] 2026.04.04 04:33:35 UTC