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747-400 MAINTENANCE MANUAL
S 865-298
(7) Move the landing gear lever from the DN to the UP position.
NOTE: The gear door bits will show a state of 1 while the doors are
____ in transit. Look at the CDU display for the gear door bits while the gear is in transit.
(a) Look at the bit status for the gear door sensors while the gear is in transit, as follows: 1) 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 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
(b)
Make sure all the landing gear are retracted and the gear doors are closed.
(c)
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| 0 |NOT DOWN | .............................................................. |L Wing Gear Down/Lock on Bit 12| 0 |NOT DOWN |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
~............................................................ | Sensor and Bit Location | Bit State | Description | .............................................................. |R Wing Gear Down/Lock on Bit 13| 0 |NOT DOWN | .............................................................. |R Body Gear Down/Lock on Bit 14| 0 |NOT DOWN | .............................................................. |L Body Gear Up/Lock on Bit 15 | 1 |GEAR UP | .............................................................. |L Wing Gear Up/Lock on Bit 16 | 1 |GEAR UP | .............................................................. |R Wing Gear Up/Lock on Bit 17 | 1 |GEAR UP | .............................................................. |R Body Gear Up/Lock on Bit 18 | 1 |GEAR UP | .............................................................. |L Body Gear Door Open on Bit 24| 0 |NOT OPEN | .............................................................. |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
(d) Make sure the CDU shows shows the bit status of label 273/00 as follows:
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