(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 35-00-00/201, Oxygen
(4)
AMM 35-21-06/401, Supernumerary Oxygen Mask
(5)
SSM 35-11-01
B. Access
(1) Location Zone 124 Fwd Cargo Container Compartment, Aft Half Right 200 Upper Half Fuselage
C. Procedure
S 912-050-002
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 862-026-002
(2)
Make sure the following curcuit breakers are closed:
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
2) 7D3 OXY RESET PWR
(3)
Supply the electrical power (AMM 24-22-00/201).
S 862-027-002
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A 747-400 MAINTENANCE MANUAL
(4) S 862-028-002Reset the the flow control units.
NOTE:____ Flow control units will not reset if the cabin pressure is above 12,000-foot altitude.
(a) (b) Momentarily move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to RESET.Check that the indicators on the flow control units have moved away from ON.
(5) S 862-029-002Check that the NO SMOKING and the ceiling lights extinguish. Open the ten mask shutoff valves to bleed the oxygen system. (a) Pull the valve clip assembly out of the unitized valve assembly and remove the masks from the oxygen box.
(6) S 432-044-002Do the Task: Supernumerary Oxygen Mask Installation (AMM 35-21-06/401).
(7) S 612-046-002Do the Task: Oxygen System Servicing (Cylinder Replacement) (AMM 12-15-08/301).
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A
747-400 MAINTENANCE MANUAL
SUPERNUMERARY OXYGEN SYSTEM - ADJUSTMENT/TEST
_____________________________________________
1. General_______
A. These tasks are included in this procedure:
(1)
Supernumerary Oxygen System Operational Test
(2)
Oxygen Cylinder Alternate (Electrical) Actuation Operational Test
(3)
Oxygen System Test
(4)
Oxygen System High Pressure Leak Test
(5)
Oxygen System Low Pressure Leak Test
(6)
Simulated Automatic Actuation and Alternate (Electrical) Actuation Test
(7)
Oxygen Mask Drop Test.
B. The oxygen system usually operates automatically (with an alternate override) which is set by the cabin conditions. The operational test is a check of the system for correct servicing to meet the dispatch requirements.
C. A system test is done when maintenance is only partially complete which leaves the integrity of the system in doubt. It is also done when it is necessary to meet a periodic functional test requirements.
TASK 35-21-00-705-001
2. Supernumerary Oxygen System Operational Test____________________________________________
A. Consumable Materials
(1) G02311 Tape - Masking Non Residue, 3M-226
B. References
(1)
AMM 12-15-08/301, Oxygen
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 31-61-00/201, Integrated Display System
(4)
AMM 32-09-02/201, Air/Ground Relays
(5)
AMM 35-00-00/201, Oxygen
(6)
AMM 35-21-00/501, Supernumerary Oxygen System
(7)
AMM 35-21-06/401, Supernumerary Oxygen Mask
(8)
WDM 35-11-11, 35-11-12, 35-11-13
(9)
SSM 35-11-01
C. Access
(1) Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
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