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MAINTENANCE MANUAL
~.......................................................................... | BIT TABLE | ............................................................................ | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | R BODY GR | E/099/272/00 | 23 | NOT TILTED | TILTED | | TILT ALT | | | | | ............................................................................ | | E/099/273/00 | 21 | AIR MODE | GND MODE | ............................................................................ | GEAR LEVER | E/099/273/00 | 25 | NOT DOWN | LEVER DOWN | 2................…...................…..........…............….............1
S 865-142
(2) Prepare the CMC for the test:
(a) Push the line-select key, adjacent to the INPUT MONITORING
display.
(b) Push the CDU keys E/099/270/00, then push key 1L.
(c) Push the NEXT PAGE key.
(d) Push the CDU keys E/099/271/00.
(e) Push the NEXT PAGE key.
(f) Push the CDU keys E/099/272/00.
(g) Push the NEXT PAGE key.
(h) Push the CDU keys E/099/273/00.
S 865-026
(3) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel
1) 7F23 LANDING GEAR DSP & CONT ALTN
2) 7F26 PSEU SECT 2
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(4) Open these circuit breakers and install DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7F22 LANDING GEAR DSP & CONT PRI
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747-400 MAINTENANCE MANUAL
2) 7F25 PSEU SECT 1
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(5)
Push the NEXT PAGE key as necessary to show the logic conditions of label 272/00.
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(6)
Do a test of the gear lever switch while the air mode is simulated:
(a)
Make sure the CDU display of label 272/00 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 | 0 |NOT TILTED | .............................................................. |R Wing Tilt on Bit 22 | 0 |NOT TILTED | .............................................................. |R Body Tilt on Bit 23 | 0 |NOT TILTED | 2.................................…............….............1
(b)
Push the NEXT PAGE key as necessary to show the logic
conditions of label 273/00.
(c)
Make sure the CDU display of label 273/00 is shown as follows:
~............................................................ | Signal and Bit Location | Bit State | Description | .............................................................. |Air/Gnd Gnd Mode on Bit 21 | 1 |GND MODE | .............................................................. |Gear Lever Switch on Bit 25 | 1 |LEVER DOWN | 2.................................…............….............1
(d)
Make sure the landing gear lever cannot be moved from the DN to the UP position without the lock override.
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(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
(m)
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747-400 MAINTENANCE MANUAL
Use the lock override and move the landing gear lever from the
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