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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(z) Remove the actuator from the sensor, S404 (right wing gear up/lock sensor).
S 745-056
(4)
Do a test of the nose gear position indication:
(a)
Push the NEXT PAGE key as necessary to show the logic conditions of label 271/00.
(b)
Make sure the CDU display of label 271/00 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, S397 (primary nose gear lock sensor).
(e)
Make sure the CDU display of label 271/00 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
(g)
Put a rectangular actuator on the sensor, S396 (primary nose gear up sensor).
(h)
Make sure the CDU display of label 271/00 is shown as follows:
(i)
Condition - Gear Up 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
(j)
Remove the deactuator from the sensor, S397 (primary nose gear lock sensor).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(k) (l) Make sure the CDU display of label 271/00 is shown as follows:Condition - Gear Up and Locked
~.............................................. | Sensor and Bit Location | Bit State | ................................................ |Nose Gear Down/Lock on Bit 18 | 0 | ................................................ |Nose Gear Up/Lock on Bit 19 | 1 | 2.................................…............1
(m) Remove the actuator from the sensor, S396 (primary nose gear up sensor).
H. Do a Test of the Alternate Landing Gear Position Indication (Fig. 502)
S 745-263
(1) Use the table that follows to identify the port/label and bit data necessary in the subsequent steps.
NOTE: This data is necessary when you do the system test for the
____ position indication system of the landing gear.
~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | L BODY GR | E/099/272/00 | 11 | NOT DOWN | GEAR DOWN | | DOWN/LOCK ALT | | | | | ............................................................................ | L WING GR | E/099/272/00 | 12 | NOT DOWN | GEAR DOWN | | DOWN/LOCK ALT | | | | | ............................................................................ | R WING GR | E/099/272/00 | 13 | NOT DOWN | GEAR DOWN | | DOWN/LOCK ALT | | | | |
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