(10)
 Install the bottle discharge line.

 S 915-291

 (11)
 Do the Leakage test again for the forward and aft nozzles on the inboard strut no. 2, the inboard strut no. 3 and the outboard strut no. 4.

 S 865-257

 (12)
 Put the Airplane back to its usual condition.

 S 095-092
 WARNING:_______REFER TO AMM 27-81-00/201 FOR THE LOCK REMOVAL PROCEDURES. THE FLAPS WILL RETRACT IN SEVEN SECONDS AND CAN INJURE PERSONNEL.
 (13) Remove the safety locks for the leading edge flap (AMM 27-81-00/201).
 S 415-231
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (14) Retract the leading edge flaps (AMM 27-81-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 26-21-00-735-220
 5. Pressure Switch Test
____________________
 A. Special Tools and Equipment
 (1)  G26001-105 - Squib Test Box
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 C. Access
 (1)  Location Zone
 221 Control Cabin LH
 222 Control Cabin RH
 514 Krueger Flap No.1, Left
 614 Krueger Flap No.1, Right

 D. Prepare for the Tests
 S 015-240
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. IF THE FLAPS MOVE INJURY TO PERSONS CAN OCCUR.
 WARNING: INSTALL LOCKS TO PREVENT MOVEMENT OF THE FLAPS
_______ (AMM 27-81-00/201). IF THE LOCKS ARE NOT INSTALLED INJURY TO PERSONS CAN OCCUR.
 (1)  
Extend the wing leading edge flaps to get access to the engine bottle electrical connectors.

 S 495-223

 (2)  
Install safety locks on all extended leading edge flaps where persons are near (AMM 27-81-00/201).

 S 865-224

 (3)  
Open these circuit breakers:

 (a)  P6, Main Power Distribution Panel
 1) 6H1, FIRE EXTINGUISHER ENG 1&3 B
 2) 6H2, FIRE EXTINGUISHER ENG 1&3 A
 3) 6H3, FIRE EXTINGUISHER ENG 2&4 B
 4) 6H4, FIRE EXTINGUISHER ENG 2&4 A

 E. The Pressure Switch Test
 S 865-181
 (1)  Push and hold the manual override pressure switch, or insert the hex key into the bottle pressure switch cam and turn the key with a maximum of 5.7 pound-inch on the left bottle (M228).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 02 Page 517 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (2)  S 735-186Make sure the EICAS message "BTL LOW L ENG A" shows.
 (3)  S 735-226Make sure the Bottle A discharge ENG 1&2 light on the P5 panel comes on.

 S 865-187
 (4)  
Release the pressure switch, or hex key.

 S 735-189

 (5)  
Make sure the EICAS message does not show.

 S 865-190

 (6)  
Push and hold the manual override pressure switch, or insert the hex key into the bottle pressure switch cam and turn the key with a maximum of 5.7 pound-inch on the right bottle (M229).

 S 735-194

 (7)  
Make sure the EICAS message "BTL LOW L ENG B" shows.

 S 735-252

 (8)  
　
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