(c)  
Open the shutoff valve on each oxygen "test" cylinder.

 S 865-033
 (8)  Loosely install the oxygen box doors so the doors do not unlatch and the oxygen masks do not drop.
 NOTE: Use the tape or other applicable means to make sure the
____ door does not drop.
 S 785-034
 (9)  Compare the pressure on the EICAS with the average of the pressures on the oxygen cylinder gages.
 NOTE: See the paragraph "Oxygen Pressure Indication Test".
____
 S 865-035
 (10)
 Move the SUPRNMRY OXYGEN switch on the P5 Pilot's Overhead Panel to ON.

 S 735-036

 (11)
 Do a visual check that these things occur:

 (a)  
All the oxygen box doors unlatch.

 (b)  
SUPRNMRY OXY ON advisory message shows on the EICAS.

 (c)  
Indicator on the flow control unit moves to ON.

 S 865-037
 (12)
 Move the SUPRNMRNY OXYGEN switch on the P5 Pilot's Overhead Panel to RESET (switch automatically moves back to NORMAL).

 S 865-038

 (13)
 Open some of the mask shutoff valves in the oxygen boxes and bleed the system pressure down to 0.0 psi.

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747-400 MAINTENANCE MANUAL
 S 735-039
 (14) Do a visible check that these things occur:
 (a)  
SUPRNMRY OXY ON advisory message does not show on the EICAS.

 (b)  
Indicator on the flow control unit moves away from ON.

 S 865-040
 (15)
 Do the task: "Install the Oxygen Mask" if it is necessary (Ref 35-21-06/401).

 S 865-041

 (16)
 Close the oxygen box doors:

 (a)  
Carefully push a 1/4-inch Allen wrench or metal rod through the access hole and lift the plunger on the latch.

 (b)  
Lift the oxygen box door until it engages the latch and remove the Allen wrench or the metal rod.

 S 865-042
 (17)
 Remove the tape or the other devices used to hold the oxygen boxes.

 S 865-043

 (18)
 If you used portable "test" cylinder(s), do the steps that follow:

 (a)  
Close the shutoff valve on each oxygen "test" cylinder.

 (b)  
Disconnect the portable test line at point B and install plug.

 (c)  
Open the shutoff valve on each supernumerary oxygen cylinder.

 S 215-044
 (19)
 Do a check at the supernumerary oxygen cylinder and test connections for leaks with leak detection compound.

 S 615-045

 (20)
 Do the task: "Oxygen System Servicing (Cylinder Replacement)" (AMM 12-15-08/301) if it is necessary.

 (21)
 Close all the access panels to the supernumerary oxygen cylinders.

 (22)
 Remove electrical power if it is not necessary (Ref 24-22-00/201).

 S 415-046
 S 865-047
 TASK 35-21-00-705-048
 4. Oxygen System Test (Fig. 501)
__________________
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747-400
MAINTENANCE MANUAL

SUPERNUMERARY OXYGEN CYLINDERS SEE

SUPERNUMERARY OXYGEN CYLINDERS

Test Connections
Figure 501 (Sheet 1)

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