MID SPAN LATCH
OPEN SWITCH
(AFT)
HOOK CLOSE
SWITCH
MID SPAN
LATCH OPEN
SWITCH
(FORWARD)
MASTER LATCH
LOCK SWITCH
HOOK DOOR CLOSE
POSITION SWITCH
SWITCH
LATCH OPEN
SWITCH
LATCH CLOSE
SWITCH
FORWARD CARGO DOOR
Cargo Door Sequence Switches
Figure 601 (Sheet 1)
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MAINTENANCE MANUAL
DOOR UP
SWITCH
MID SPAN LATCH
OPEN SWITCH
(AFT)
HOOK CLOSE
SWITCH
LATCH OPEN
SWITCH
MID SPAN
LATCH OPEN
SWITCH
(FORWARD)
MASTER LATCH
LOCK SWITCH
DOOR CLOSE
SWITCH
LATCH CLOSE
SWITCH
HOOK POSITION
SWITCH
AFT CARGO DOOR
Cargo Door Sequence Switches
Figure 601 (Sheet 2)
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(3) S 866-015Disconnect the P3 connector at the cargo door junction box.
(4) S 766-006Do a continuity check for the hook position switch. (a) Get access to the switch. (b) Make sure that there is no continuity between pins 7 and 11 on the P3 connector. (c) Push in on the switch plunger. (d) While you hold the plunger in, make sure there is continuity between pins 7 and 11 on the P3 connector.
(5) S 766-013Do a continuity check for the forward midspan latch open switch. (a) Get access to the switch. (b) Make sure that there is no continuity between pins 13 and 8 on the P3 connector. (c) Push in on the switch plunger. (d) While you hold the plunger in, make sure there is continuity between pins 13 and 8 on the P3 connector.
(6) S 766-018Do a continuity check of the aft midspan latch open switch. (a) Get access to the switch. (b) Make sure that there is no continuity between pin 13 on the P3 connector and pin 4 on the P5 connector.
NOTE:____ The P5 connector is on the door restraint solenoid.
(c) (d) (e) Push in on the switch plunger.While you hold the plunger in, make sure there is continuity between pin 13 on the P3 connector and pin 4 on the P5 connector.Connect the P5 electrical connector to the door restraint solenoid.
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747-400 MAINTENANCE MANUAL
S 766-021
(7)
Do a continuity check of the master latch lock switch.
(a)
Get access to the switch.
(b)
Make sure that there is no continuity between pins 4 and 1 on the P3 connector.
(c)
Push in on the switch plunger.
(d)
While you hold the plunger in, make sure there is continuity between pins 4 and 1 on the P3 connector.
S 216-028
(8)
Do a continuity check of the latch open switch.
(a)
Get access to the switch.
(b)
Make sure that there is no continuity between pins 15 and 12 on the P3 connector.
(c)
Push in on the switch plunger.
(d)
While you hold the plunger in, make sure there is continuity between pins 15 and 12 on the P3 connector.
S 426-030
(9)
Connect the P3 connector to the cargo door junction box.
S 866-008 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 舱门 DOORS 3(82)
