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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 ~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | R BODY GR | E/099/272/00 | 14 | NOT DOWN | GEAR DOWN | | DOWN/LOCK ALT | | | | | ............................................................................ | L BODY GR | E/099/272/00 | 15 | NOT UP | GEAR UP | | UP/LOCK ALT | | | | | ............................................................................ | L WING GR | E/099/272/00 | 16 | NOT UP | GEAR UP | | UP/LOCK ALT | | | | | ............................................................................ | R WING GR | E/099/272/00 | 17 | NOT UP | GEAR UP | | UP/LOCK ALT | | | | | ............................................................................ | R BODY GR | E/099/272/00 | 18 | NOT UP | GEAR UP | | UP/LOCK ALT | | | | | ............................................................................ | NOSE GR | E/099/273/00 | 18 | NOT DOWN | DOWN | | DOWN/LOCK ALT | | | AND LOCKED | AND LOCKED | ............................................................................ | NOSE GR | E/099/273/00 | 19 | NOT UP | GEAR UP | | UP/LOCK ALT | | | AND LOCKED | AND LOCKED | 2................…...................…..........…............….............1
 S 865-057
 (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 865-058
 (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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  7F25 PSEU SECT 1
 S 865-147
 (4)  
Prepare the CMC for the test:

 (a)  
Push the line-select key, adjacent to the INPUT MONITORING display.

 (b)  
Push the CDU keys E/099/270/00, then push key 1L.

 (c)  
Push the NEXT PAGE key.

 (d)  
Push the CDU keys E/099/271/00.

 (e)  
Push the NEXT PAGE key.

 (f)  
Push the CDU keys E/099/272/00.

 (g)  
Push the NEXT PAGE key.

 (h)  
Push the CDU keys E/099/273/00.

 S 745-059
 (5)  
Do a test of the nose gear position indication:

 (a)  
Push the NEXT PAGE key as necessary to show the logic conditions of label 273/00.

 (b)  
Make sure the CDU display of label 273/00 is shown as follows:

 (c)  
Condition - Gear Down and Locked

 ~.............................................. | Sensor and Bit Location | Bit State | ................................................ |Nose Gear Down/Lock on Bit 18 | 1 | ................................................ |Nose Gear Up/Lock on Bit 19 | 0 | 2.................................…............1

 (d)  
Put a rectangular deactuator on the sensor, S424 (alternate nose gear lock sensor).

 (e)  
Make sure the CDU display of label 273/00 is shown as follows:

 (f)  
Condition - Gear Down and Unlocked

 ~.............................................. | Sensor and Bit Location | Bit State | ................................................ |Nose Gear Down/Lock on Bit 18 | 0 | ................................................ |Nose Gear Up/Lock on Bit 19 | 0 | 2.................................…............1
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