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747-400 MAINTENANCE MANUAL
S 866-005
(4) Put the mask/regulator back in the stowage box (AMM 35-11-18/201).
TASK 35-11-18-206-006
3. Smoke Goggles Inspection________________________
A. References
(1)
AMM 35-00-00/201, Oxygen
(2)
IPC 35-11-18
B. Access
(1) Location Zone
221 Control Cabin, Left
221 Control Cabin, Right
C. Procedure
S 916-010
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 216-007
(2)
Do a visual check of the smoke goggles:
(a)
Examine the foam face seal: 1) Make sure it is clean 2) Examine it for deterioration 3) Make sure it does not have cracks or tears 4) Make sure there is no discoloration 5) Make sure it does not have some other damage.
(b)
Examine the lens: 1) Make sure it is clean 2) Make sure it does not have cracks or scratches 3) Make sure there is no discoloration 4) Make sure it does not have more damage.
(c)
Examine the elastic strap:
1) Make sure it is clean
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747-400 MAINTENANCE MANUAL
2) Make sure it does not have cracks.
3) Make sure it extends and retracts satisfactorily
4) Make sure it is correctly installed to the facepiece.
5) Make sure it does not have some other damage.
(d) Replace smoke goggles if it is not in satisfactory condition.
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747-400 MAINTENANCE MANUAL
SUPERNUMERARY OXYGEN SYSTEM - DESCRIPTION AND OPERATION
_______________________________________________________
1. General (Fig. 1)
_______
A. The oxygen system delivers supplemental and protective breathing oxygen to the upper deck cabin area. System operation is started either automatically by an aneroid device when cabin pressure decreases to an equivalent of 13,250 to 14,500 feet altitude, or electrically by a switch on the pilot's overhead panel, P5. Oxygen is supplied by oxygen storage cylinders, each close-coupled to a pressure reducer and a pressure transducer. The pressure reducers feed into a medium pressure line which supplies the flow control unit. Each oxygen cylinder has a safety relief device to supply protection against excessive pressure. Flow and pressure is controlled by the flow control unit.
B. Low pressure oxygen from the flow control unit is supplied to distribution manifolds. The distribution manifolds have connections to which flexible hoses may be attached to deliver oxygen to the oxygen boxes. Each oxygen box has an unitized valve assembly and oxygen masks with tubing to supply oxygen to the supernumerary passengers. Oxygen boxes are found above each supernumerary seat (PSUs), in each lavatory, and crew rest.
C. The pressure transducer voltage outputs feed into a voltage averaging unit. The output of the voltage unit is then fed to the EICAS.
D. The tubing between the oxygen cylinders and the flow control unit in the high pressure side of the system is made of corrosion-resistant steel with flareless-type steel fittings. The overboard discharge relief line is also constructed for high pressure. The low pressure tubing downstream of the flow control unit is made of aluminum with flareless-type aluminum fittings having stainless steel sleeves, or quick-disconnect coupling assemblies with O-ring seals.
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