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747-400 MAINTENANCE MANUAL
S 785-008
(8)
Make sure that the pressure shown on the EICAS is in 100 psi of the oxygen cylinder pressure.
S 865-011
(9)
Set the EIU select switch on the P2-4 panel to C.
S 785-013
(10)
Make sure the pressure shown on the EICAS is within 100 psi of the oxygen cylinder pressure indicated on the cylinder pressure gauge.
NOTE: If equipped with the optional 2nd oxygen cylinder,
____ the cylinder pressure gauge readings of the two cylinders must be averaged.
S 865-016
(11)
Set the EIU select switch on the P2-4 panel to R.
S 785-017
(12)
Make sure the pressure shown on the EICAS is within 100 psi of the oxygen cylinder pressure indicated on the cylinder pressure gauge.
NOTE: If equipped with the optional 2nd oxygen cylinder,
____ the cylinder pressure gauge readings of the two cylinders must be averaged.
S 865-108
(13)
Close the access door to the crew oxygen cylinders.
S 865-058
(14)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
TASK 35-11-00-715-204
4. Crew Oxygen Stowage Box Test (In-Situ)
______________________________________
NOTE: The In-Situ test is done at each crew station.
____
A. References
(1)
AMM 20-41-01/201, Static Grounding
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 35-00-00/201, Oxygen
B. Access
(1) Location Zones 124 Forward Cargo Container Compartment, Aft Half Right 221 Control Cabin, Left 222 Control Cabin, Right
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
C. Preconditions
S 865-253
(1) The systems that follow must be installed and serviceable to complete this test:
(a)
Electrical power (AMM 24-22-00/201).
(b)
Airplane must be in the ground mode (AMM 32-09-02/201).
(c)
Crew Oxygen System in serviceable condition (AMM 35-21-00/501).
D. Procedure
S 915-190
(1)
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).
S 865-059
(2)
Make sure the airplane is electrically grounded (AMM 20-41-01/201).
S 865-160
(3)
Supply the electrical power (AMM 24-22-00/201).
S 865-161
(4)
Open the access door to the crew oxygen cylinders.
S 865-162
(5)
Make sure the shutoff valve on each crew oxygen cylinder is open.
NOTE: Some airplanes have an optional second crew oxygen cylinder.
____
S 865-164
(6) Close these circuit breakers and attach DO-NOT-REMOVE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
S 715-020
(7) Move the PRESS TO TEST AND RESET control lever to the TEST position.
NOTE: Hold the PRESS TO TEST AND RESET lever in this position
____
for the complete test.
S 715-021
(8)
Make sure the flow blinker momentarily shows the flow and then goes out of view.
S 715-023
(9)
Push the PRESS TO TEST button on the demand regulator for
approximately one second and then release it.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
S 715-024 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 氧气 OXYGEN(18)
