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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 35-11-00
 ALL  ú ú 04 Page 505 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 715-024
　
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