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 D.

E.
F.
A
747-400 MAINTENANCE MANUAL
Preconditions
 S 865-002
 (1)  
The systems that follow must be installed and serviceable to complete this test:

 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS), serviceable (AMM
 31-61-00/501).

 (c)  
EICAS, serviceable (AMM 31-61-00/201).

 (d)  
Supernumerary Oxygen System, serviceable (AMM 35-21-00/501).

 (e)
Airplane must be in the Ground Mode (AMM 32-09-02/201).Prepare for Airplane Dispatch Requirement and Pressure Indication Test

 S 865-003

 (1)  
Supply the electrical power (Ref 24-22-00/201).

 S 015-004

 (2)  
Open the access panels to the oxygen cylinders.

 NOTE: The oxygen cylinders are attached by snaps and velcro tape.
____
 S 865-005
 (3)  Close this circuit breaker and attach a DO-NOT-REMOVE tag:
 (a)  P6 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND

 S 865-006
 (4)  Do the task: "Obtain Airplane Information Report" (Ref 31-61-00/201)
 to apply power to the EICAS (if necessary).Do the Airplane Dispatch Requirement Test
 S 715-007
 (1)  
Make sure the shutoff valves on the supernumerary oxygen cylinders are opened.

 S 785-008

 (2)  
Make sure the pressure shown on each oxygen cylinder meets the requirement needed for dispatch.

 S 215-009

 (3)  
Make sure the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel is in the NORM position.

 (4)  
Also make sure the switch guard on the P5 panel is closed.

 S 215-010
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 S 715-011
 (5)  Make sure the SUPRNMRY OXY ON message on the EICAS does not show on the status page.
 G. Do the Pressure Indication Test
 S 785-012
 (1)  
Make sure the pressure shown on each oxygen cylinder meets the requirement needed for dispatch.

 S 865-013

 (2)  
Set the EIU select switch on the P2-4 panel to L.

 S 785-014

 (3)  
Make sure the pressure shown on the EICAS is within 100 psi of the average cylinder pressure.

 S 865-015

 (4)  
Set the EIU select switch on the P2-4 panel to C.

 S 785-016

 (5)  
Make sure the pressure shown on the EICAS is in 100 psi of the average cylinder pressure.

 S 865-017

 (6)  
Set the EIU select switch on the P2-4 panel to R.

 S 785-018

 (7)  
Make sure the pressure shown on the EICAS is in 100 psi of the average cylinder pressure.

 S 865-019

 (8)  
Remove the power from the EICAS if it is not necessary (Ref 31-61-00/201).

 S 865-020

 (9)  
Remove electrical power if it is no longer necessary (Ref
 24-22-00/201).

 (10)
 Close all the access panels to the supernumerary oxygen cylinders.

 S 715-022

 (11)
 Do the task:  Oxygen Cylinder Alternate (Electrical) Actuation Operational Test.

 S 415-021
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 TASK 35-21-00-715-023
 3.  Oxygen Cylinder Alternate (Electrical) Actuation Operational Test_________________________________________________________________
 A. Standard Tools and Equipment
　
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