~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | L BODY GR | E/070/270/00 | 24 | NOT OPEN | DOOR OPEN | | DOOR OPEN PRI | | | | | ............................................................................ | L WING GR | E/070/270/00 | 25 | NOT OPEN | DOOR OPEN | | DOOR OPEN PRI | | | | | ............................................................................ | NOSE GR DOOR | E/070/270/00 | 26 | NOT OPEN | DOOR OPEN | | OPEN PRI | | | | | ............................................................................ | R WING GR | E/070/270/00 | 27 | NOT OPEN | DOOR OPEN | | DOOR OPEN PRI | | | | | ............................................................................ | R BODY GR DOOR | E/070/270/00 | 28 | NOT OPEN | DOOR OPEN | | OPEN PRI | | | | | 2................…...................…..........…............….............1
S 865-081
(2)
Open these circuit breakers on the Overhead Circuit Breaker Panel, P7 and install DO-NOT-CLOSE tags:
(a)
7F23 LANDING GEAR DSP & CONT ALTN
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A
747-400 MAINTENANCE MANUAL
(b) 7F26 PSEU SECT 2
S 745-083
(3)
Do a test of the door position sensors:
(a)
Put an actuator on the sensor, S406 (door warning nose gear primary sensor).
(b)
Push the PREVIOUS PAGE key as necessary to show the logic conditions of label 270/00.
(c)
Make sure the CDU display of label 270/00 is shown 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 | 0 |NOT 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
(d)
Remove the actuator from the sensor, S406 (door warning nose gear primary sensor).
(e)
Put an actuator on the sensor, S410 (door warning right wing gear primary sensor).
(f)
Make sure the CDU display of label 270/00 is shown 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| 0 |NOT OPEN | .............................................................. |R Body Gear Door Open on Bit 28| 1 |DOOR OPEN | 2...............................…..............….............1
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(g)
(h)
(i)
(j)
(k)
(l)
(m)
(n)
A
747-400 MAINTENANCE MANUAL
Put an actuator on the sensor, S409 (door warning right body
gear primary sensor).
Remove the actuator from the sensor, S410 (door warning right
wing gear primary sensor).
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