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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 ~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | R BODY GR | E/099/272/00 | 23 | NOT TILTED | TILTED | | TILT ALT | | | | | ............................................................................ | | E/099/273/00 | 21 | AIR MODE | GND MODE | ............................................................................ | GEAR LEVER | E/099/273/00 | 25 | NOT DOWN | LEVER DOWN | 2................…...................…..........…............….............1
 S 865-142
 (2)  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 865-026
 (3)  Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1)  7F23 LANDING GEAR DSP & CONT ALTN
 2)  7F26 PSEU SECT 2
 S 865-094
 (4)  Open these circuit breakers and install DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1)  7F22 LANDING GEAR DSP & CONT PRI

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 2) 7F25 PSEU SECT 1
 S 865-143
 (5)  
Push the NEXT PAGE key as necessary to show the logic conditions of label 272/00.

 S 735-028

 (6)  
Do a test of the gear lever switch while the air mode is simulated:

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

 ~............................................................ | Sensor and Bit Location | Bit State | Description | .............................................................. |L Body Tilt on Bit 19 | 0 |NOT TILTED | .............................................................. |L Wing Tilt on Bit 20 | 0 |NOT TILTED | .............................................................. |R Wing Tilt on Bit 22 | 0 |NOT TILTED | .............................................................. |R Body Tilt on Bit 23 | 0 |NOT TILTED | 2.................................…............….............1

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

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

 ~............................................................ | Signal and Bit Location | Bit State | Description | .............................................................. |Air/Gnd Gnd Mode on Bit 21 | 1 |GND MODE | .............................................................. |Gear Lever Switch on Bit 25 | 1 |LEVER DOWN | 2.................................…............….............1

 (d)  
Make sure the landing gear lever cannot be moved from the DN to the UP position without the lock override.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 (e)

(f)

(g)

(h)

(i)

(j)

(k)

(l)

(m)

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747-400 MAINTENANCE MANUAL
Use the lock override and move the landing gear lever from the
　
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