Loss of the Emergency Overpressure Knob on the Oxygen Mask

TASK 35-10-00-810-804-A
Loss of the Emergency Overpressure Knob on the Oxygen Mask

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 35-12-41-000-002	Removal of the Full-Face/Quick-Donning Oxygen-Mask
AMM 35-12-41-400-002	Installation of the Full-Face/Quick-donning Oxygen-Mask
AMM 35-12-41-710-001	Operational Test of the Full Face/Quick Donning Oxygen Masks

3. Fault Confirmation
Subtask 35-10-00-710-054-A

A. Test
(1) Do the operational test of the full face/quick donning oxygen mask AMM 35-12-41-710-001.

4. Fault Isolation
Subtask 35-10-00-810-053-B

A. If during the operational test
(1) The emergency overpressure knob on the Captain oxygen mask is inoperative:

replace the MASK-FULL FACE/Q.D. OXY, CAPT [5759HM] AMM 35-12-41-000-002 and AMM 35-12-41-400-002.

(2) The emergency overpressure knob on the First Officer oxygen mask is inoperative:

replace the MASK-FULL FACE/Q.D. OXY, F/O [5758HM] AMM 35-12-41-000-002 and AMM 35-12-41-400-002.

(3) The emergency overpressure knob on the Third Occupant oxygen mask is inoperative:

replace the MASK-FULL FACE/Q.D. OXY, 3RD OCCPNT [5757HM] AMM 35-12-41-000-002 and AMM 35-12-41-400-002.

(4) The emergency overpressure knob on the Fourth Occupant oxygen mask is inoperative:

replace the MASK-FULL FACE/Q.D. OXY, 4TH OCCPNT [5760HM] AMM 35-12-41-000-002 and AMM 35-12-41-400-002.

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