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747-400
MAINTENANCE MANUAL
~.......................................................................... | BIT TABLE (Alternate) | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | NOSE GR | E/099/273/00 | 18 | NOT DOWN | DOWN AND | | DOWN/LOCK ALT | | | AND LOCKED | LOCKED | ............................................................................ | NOSE GR | E/099/273/00 | 19 |NOT UP AND |GEAR UP AND | | UP/LOCK ALT | | | LOCKED | LOCKED | ............................................................................ | | E/099/273/00 | 21 | AIR MODE | GND MODE | ............................................................................ | GEAR LEVER | E/099/273/00 | 25 | NOT DOWN | LEVER DOWN | 2................…...................…..........…............….............1
(2) S 865-293Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P7 Overhead Circuit Breaker Panel 1) 7F22 LANDING GEAR DSP & CONT PRI 2) 7F25 PSEU SECT 1
(3) S 745-294Push the PREVIOUS PAGE key as necessary to show the logic conditions of label 272/00 and 273/00.
S 865-295
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE LANDING
_______ GEAR AND DOOR OPERATION AREA. A FAST MOVEMENT OF THE LANDING GEAR AND DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(4) Make sure that all persons are away from the landing gear and the landing gear doors.
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747-400 MAINTENANCE MANUAL
S 865-296
(5)
Move the landing gear lever from the OFF to the DN position.
(a)
Make sure all the landing gear are down and the gear doors are closed.
(b)
Make sure the CDU shows shows the bit status of label 272/00 as follows: ~............................................................ | Sensor and Bit Location | Bit State | Description | .............................................................. |L Body Gear Down/Lock on Bit 11| 1 |GEAR DOWN | .............................................................. |L Wing Gear Down/Lock on Bit 12| 1 |GEAR DOWN | .............................................................. |R Wing Gear Down/Lock on Bit 13| 1 |GEAR DOWN | .............................................................. |R Body Gear Down/Lock on Bit 14| 1 |GEAR DOWN | .............................................................. |L Body Gear Up/Lock on Bit 15 | 0 |NOT UP | .............................................................. |L Wing Gear Up/Lock on Bit 16 | 0 |NOT UP | .............................................................. |R Wing Gear Up/Lock on Bit 17 | 0 |NOT UP | .............................................................. |R Body Gear Up/Lock on Bit 18 | 0 |NOT UP | .............................................................. |L Body Tilt on Bit 19 | 1 |TILTED | .............................................................. |L Wing Tilt on Bit 20 | 1 |TILTED | .............................................................. |R Wing Tilt on Bit 22 | 1 |TILTED | .............................................................. |R Body Tilt on Bit 23 | 1 |TILTED | .............................................................. |L Body Gear Door Open on Bit 24| 0 |NOT OPEN |
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747-400 MAINTENANCE MANUAL
~............................................................ | Sensor and Bit Location | Bit State | Description | .............................................................. |L Wing Gear Door Open on Bit 25| 0 |NOT OPEN | .............................................................. |Nose Gear Door Open on Bit 26 | 0 |NOT OPEN | .............................................................. |R Wing Gear Door Open on Bit 27| 0 |NOT OPEN | .............................................................. |R Body Gear Door Open on Bit 28| 0 |NOT OPEN | 2...............................…..............….............1
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