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747-400 MAINTENANCE MANUAL
S 745-021
(5) Do a test of the tilt sensors for the left and right body gear:
NOTE: When the targets for the sensors are far, or a deactuator is
____ installed on the sensor, this will cause a ground mode indication.
(a)
Put an actuator on the sensor, S419 (left body gear tilt sensor).
(b)
Remove the actuator from the sensor, S418 (right body gear tilt sensor).
(c)
Make sure the CDU display of label 270/00 is shown as follows:
~............................................................ | Sensor and Bit Location | Bit State | Description | .............................................................. |L Body Tilt on Bit 19 | 1 |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
(d)
Put an actuator on the sensor, S417 (left wing gear tilt sensor).
(e)
Remove the actuator from the sensor, S419 (left body gear tilt sensor).
(f)
Make sure the CDU display of label 270/00 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 | 1 |TILTED | .............................................................. |R Wing Tilt on Bit 22 | 0 |NOT TILTED | .............................................................. |R Body Tilt on Bit 23 | 0 |NOT TILTED | 2.................................…............….............1
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747-400 MAINTENANCE MANUAL
(g)
Put an actuator on these sensors:
1) S419, left body gear tilt (primary)
2) S416, right wing gear tilt (primary)
3) S418, right body gear tilt (primary)
(h)
Make sure that you can move the landing gear lever from the DN to the UP position without the lock override.
(i)
Move the landing gear lever to the DN position.
(j)
Remove the actuators from sensors:
1) S417, left wing gear tilt
2) S419, left body gear tilt
3) S416, right Wing gear tilt
4) S418, right body gear tilt
H.
Do a Test of the Alternate Tilt Position Sensors and the Gear Lever Switch (Fig. 502)
S 745-261
(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
____ tilt position sensors and the gear lever switch.
~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | L BODY GR | E/099/272/00 | 19 | NOT TILTED | TILTED | | TILT ALT | | | | | ............................................................................ | L WING GR | E/099/272/00 | 20 | NOT TILTED | TILTED | | TILT ALT | | | | | ............................................................................ | R WING GR | E/099/272/00 | 22 | NOT TILTED | TILTED | | TILT ALT | | | | |
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