(l)  
Close the right lid of the stowage box.

 S 712-005
 (5)  
Do the task: "Operational Test - Crew Oxygen" (AMM 35-11-00/501).

 S 712-009

 (6)  
Do this task to make sure the captain's boom mic operates correctly: " Flight Interphone System Test " (AMM 23-51-00/501).

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747-400 MAINTENANCE MANUAL
 MASK/REGULATOR AND STOWAGE BOX - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General
_______
 A.  This procedure includes these tasks:
 (1)  
Stowage Box Removal

 (2)  
Stowage Box Installation

 (3)  
Mask/Regulator Removal

 (4)  
Mask/Regulator Installation

 B.  The removal and installation procedure is for one mask/regulator and one stowage box. Do the steps in this procedure again for the other masks/regulators and stowage boxes.
 C.  A stowage box is installed at each crew station. Access to each stowage box is through the flight compartment.
 TASK 35-11-18-004-001
 2.  Stowage Box Removal (Fig. 401)
___________________
 A.  Standard Tools and Equipment
 (1)  Caps or Plugs - Package of Clean Protective
 B.  References
 (1)  
AMM 35-00-00/201, Oxygen

 (2)  
IPC 35-11-18

 (3)  
WDM 35-11-01

 C.  Access
 (1)  Location Zone
 221 Control Cabin Left
 222 Control Cabin Right

 D.  Procedure
 S 914-069
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (AMM 35-00-00/201).

 S 864-002

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A20 CAPT INTERPHONE

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747-400
MAINTENANCE MANUAL

(EXAMPLE)

Crew Oxygen Box Installation

Figure 401

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747-400 MAINTENANCE MANUAL
 2) 7A21 OBS INTERPHONE 3) 7A22 F/O INTERPHONE S 864-061 CAUTION: DO NOT TIGHTEN THE SHUTOFF VALVE ON A CREW OXYGEN CYLINDER MORE
_______
 THAN 25 POUND-INCHES. THIS CAN CAUSE DAMAGE TO THE SHUTOFF
 VALVE.
 UAL  (3)  Close the shutoff valve on the crew oxygen cylinder slowly.
 UAL
 UAL  NOTE: The shutoff valve can be tightened by hand which is____
 UAL  equivalent to 25 pound-inches.
 UAL
 S 864-068
 (4)  Set the dilution control lever on the regulator to 100%.
 S 034-064
 (5)  Set the PRESS TO TEST knob on the regulator to EMERGENCY.
 S 714-075
 (6)  Move the PRESS TO TEST AND RESET lever on the mask stowage box to
 bleed the oxygen lines.
 S 024-004
 (7)  Remove the stowage box.
 (a) Loosen the four fasteners which hold the stowage box to the
 structure and lift the stowage box.
 WARNING: LOOSEN THE FITTING CONNECTIONS CAREFULLY. THE REMAINING_______
 OXYGEN CAN RELEASE WITH A LARGE FORCE. THIS CAN CAUSE
 INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND
 EQUIPMENT.
　
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