(2)
Oxygen Mask Hose Inspection Check.
B. The mask for the PSU's (passenger service units) is installed in each PSU oxygen box. You must lower the mask door on the oxygen box to get access to the mask.
TASK 35-21-06-206-014
2. Oxygen Mask Facepiece Inspection Check______________________________________
A. Standard Tools and Equipment
(1) Rod - Metal, 1/4-inch diameter
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AMM 35-21-06/401, Oxygen Mask
(3)
IPC 35-21-06
C. Access
(1) Location Zone
200 Upper Half Fuselage
D. Procedure
S 916-012
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 016-002
(2)
Manually open the mask door on the oxygen box.
(a)
Push a 1/4-inch diameter rod into the access hole on the door.
(b)
Operate the latch and release the mask door.
(c)
Permit the masks to fall free.
S 216-003
(3) Make sure the facepiece of the oxygen mask is clean and is in satisfactory condition.
(a) Examine the facepiece for the contamination (dirt, grease, oil, or any other unwanted material).
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MAINTENANCE MANUAL
(b)
Examine the valves for contamination (dirt, grease, oil, or any other unwanted material).
(c)
Examine the facepiece for damage or deterioration. 1) Make sure it does not have cuts. 2) Make sure it is soft and flexible. 3) Examine it for deterioration. 4) Make sure it does not have more damage.
(d)
Do a check of the headstrap. 1) Make sure it retracts and extends satisfactorily. 2) Make sure it is correctly installed to the facepiece.
S 026-004
(4)
Replace the mask if it is not in satisfactory condition (AMM 35-21-06/401).
S 866-005
(5)
Put the mask back in the oxygen box (AMM 35-21-06/401).
TASK 35-21-06-206-015
3. Oxygen Mask Hose and Bag Inspection Check
_________________________________________
A. Standard Tools and Equipment
(1) Rod - Metal, 1/4-inch diameter
B. References
(1)
AMM 35-00-00/201, Oxygen
(2)
AMM 35-21-06/401, Oxygen Mask
(3)
IPC 35-21-06
C. Access
(1) Location Zone
200 Upper Half Fuselage
D. Procedure
S 916-013
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 016-007
(2)
Manually open the mask door on the oxygen box.
(a)
Push a 1/4-inch diameter metal rod into the access hole on the door.
(b)
Operate the latch and release the mask door.
(c)
Permit the masks to fall free.
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A 747-400 MAINTENANCE MANUAL
(3) S 216-008Visually examine the oxygen mask hoses and oxygen mask bags for the presence of liquid contaminants on the inside and outside surfaces.
NOTE:____ A liquid substance on the inside and outside surfaces may indicate the diffusion of phthalate plasticizer, a substance used to make the material flexible over the normal operating temperature range. The plasticizer can diffuse out of the material due to aging, thermal effects, and humidity.
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