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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-084
 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the Overhead Circuit Breaker Panel, P7:

 (a)  
7F23 LANDING GEAR DSP & CONT ALTN

 (b)  
7F26 PSEU SECT 2

 S 865-085
 (3)  
Open these circuit breakers on the Overhead Circuit Breaker Panel, P7 and install DO-NOT-CLOSE tags:

 (a)  
7F22 LANDING GEAR DSP & CONT PRI

 (b)  
7F25 PSEU SECT 1

 S 745-086
 (4)  
Do a test of the door position sensors:

 (a)  
Push the NEXT PAGE key as necessary to show the logic
 conditions of label 272/00.

 (b)  
Make sure the CDU display of label 272/00 is shown as follows:

 ~............................................................ | Sensor and Bit Location | Bit State | Description | .............................................................. |L Body Gear Door Open on Bit 24| 1 |DOOR OPEN | .............................................................. |L Wing Gear Door Open on Bit 25| 1 |DOOR OPEN | .............................................................. |Nose Gear Door Open on Bit 26 | 1 |DOOR OPEN | .............................................................. |R Wing Gear Door Open on Bit 27| 1 |DOOR OPEN | .............................................................. |R Body Gear Door Open on Bit 28| 1 |DOOR OPEN | 2...............................…..............….............1

 (c)  
Put an actuator on the sensor, S425 (door warning nose gear alternate sensor).

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 ALL  ú ú 04 Page 550 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 (d)

(e)

(f)

(g)

A
747-400 MAINTENANCE MANUAL
Make sure the CDU display of label 272/00 is shown as follows:

 ~............................................................
 | Sensor and Bit Location | Bit State | Description |
 ..............................................................
 |L Body Gear Door Open on Bit 24| 1 |DOOR OPEN |
 ..............................................................
 |L Wing Gear Door Open on Bit 25| 1 |DOOR OPEN |
 ..............................................................
 |Nose Gear Door Open on Bit 26 | 0 |NOT OPEN |
 ..............................................................
 |R Wing Gear Door Open on Bit 27| 1 |DOOR OPEN |
 ..............................................................
 |R Body Gear Door Open on Bit 28| 1 |DOOR OPEN |
 2...............................…..............….............1

Remove the actuator from the sensor, S425 (door warning nose
 gear alternate sensor).
Put an actuator on the sensor, S426 (door warning right wing
 gear alternate sensor).
Make sure the CDU display of label 272/00 is shown as follows:

 ~............................................................
 | Sensor and Bit Location | Bit State | Description |
 ..............................................................
 |L Body Gear Door Open on Bit 24| 1 |DOOR OPEN |
 ..............................................................
 |L Wing Gear Door Open on Bit 25| 1 |DOOR OPEN |
 ..............................................................
 |Nose Gear Door Open on Bit 26 | 1 |DOOR OPEN |
 ..............................................................
 |R Wing Gear Door Open on Bit 27| 0 |NOT OPEN |
 ..............................................................
 |R Body Gear Door Open on Bit 28| 1 |DOOR OPEN |
 2...............................…..............….............1

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