(b)
Install a new shim or remove the laminates from the shim as it is necessary to change the clearance.
(c)
Install the sensor and tighten the mounting screws.
G.
Do a Test of the Door Warning Sensor
S 742-041
(1) Use the table that follows to identify the port/label and bit data necessary in the subsequent test.
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747-400 MAINTENANCE MANUAL
BIT TABLE ~.......................................................................... | | Bit Condition | ............................................................................ | Switch | Port/Label | Bit | 0 | 1 | ............................................................................ | L WING GR | E/099/270/00 | 25 | NOT OPEN | DOOR OPEN | | DOOR OPEN | | | | | | PRI | | | | | ............................................................................ | R WING GR | E/099/270/00 | 27 | NOT OPEN | DOOR OPEN | | DOOR OPEN | | | | | | PRI | | | | | ............................................................................ | L WING GR | E/099/272/00 | 25 | NOT OPEN | DOOR OPEN | | DOOR OPEN | | | | | | ALT | | | | | ............................................................................ | R WING GR | E/099/272/00 | 27 | NOT OPEN | DOOR OPEN | | DOOR OPEN | | | | | | ALT | | | | | 2................…...................…..........…............….............1
S 862-020
(2)
Supply electrical power (Ref 24-22-00/201).
S 862-032
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P7 Overhead Circuit Breaker Panel:
(a)
7F23 LANDING GEAR DSP & CONT ALTN
(b)
7F22 LANDING GEAR DSP & CONT PRI
S 862-022
(4) Enter the items that follow, in the CMC scratchpad, with Input Monitoring:
PORT____ LABEL_____ SDI
E 099 270 00 E 099 271 00 E 099 272 00 E 099 273 00
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MAINTENANCE MANUAL
S 722-027
(5) Do a test of the door warning sensors for the left wing gear with the CMC:
WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ DOOR OPERATION PATH. THE FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE EQUIPMENT.
(a) Move the ground release handle for the left main gear door to the "Doors Open" position. 1) Put an actuator on the primary door warning sensor, S407
(left wing gear. 2) Make sure that Bit 25 of Label 270/Sdi 00 is a 0 (NOT OPEN). 3) Remove the actuator from the primary door warning sensor,
S407. 4) Make sure that Bit 25 of Label 270/Sdi 00 is a 1 (OPEN). 5) Put an actuator on the alternate door warning sensor, S395
(left wing gear). 6) Make sure that Bit 25 of Label 272/Sdi 00 is a 0 (NOT OPEN). 7) Remove the actuator from the alternate door warning sensor, S395. 8) Make sure that Bit 25 of Label 272/Sdi 00 is a 1 (OPEN).
S 722-024
(6) Do a test of the door warning sensors for the right wing gear with the CMC:
WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ DOOR OPERATION PATH. THE FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE EQUIPMENT.
(a) Move the ground release handle for the right main gear door to the "Doors Open" position. 1) Put an actuator on the primary door warning sensor, S410
(right wing gear). 2) Make sure that Bit 27 of Label 270/Sdi 00 is a 0 (NOT OPEN).
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