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_______ LATCH AND LOCK MACHANISM ARE NOT IN GOOD OPERATING CONDITIONS. IF THESE MECHANISM ARE JAMMED OR DAMAGED, THEY HAVE TO BE REPAIRED TO MAKE SURE THAT THE DOORS ARE LOCKED AND LATCHED SAFELY.
 (d)  Close all access panels removed to accomplish bypass procedure.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 26 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
FORWARD CARGO DOOR
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
ACTUATOR - ROTARY HOOK, YAAB01  4  1  821R, FORWARD CARGO DOOR  52-34-07 
ACTUATOR - ROTARY LATCH, YAAB02  4  1  821R, FORWARD CARGO DOOR  52-34-06 
M471 POWER UNIT - LIFT MECHANISM - FWD CARGO DOOR,  2  1 821R, FORWARD CARGO COMPARTMENT  52-34-02 
BOX - JUNCTION - LOWER CARGO DOOR - FWD, YAAJB1  1  1  821R, FORWARD CARGO DOOR  52-34-05 
CIRCUIT BREAKERS - 6  117AL, MAIN EQUIP CTR, P414 
CARGO DOOR CONTROL FORWARD, C285  1  414F15  * 
LOWER CARGO DOOR FORWARD, C814  1  414A21  * 
DOOR - CARGO, 821R  6  1  821R, FORWARD CARGO DOOR  52-34-01 
DOOR - PRESSURE RELIEF, 821BR,821ER  2  2  821R, FORWARD CARGO DOOR  52-34-04 
HANDLE - MASTER LATCH LOCK  7  1  821R, FORWARD CARGO DOOR  52-34-12 
RELAY - HOOK POSITION, YAAK01  - 1  821R, FORWARD CARGO DOOR  * 
YAAL01 SOLENOID - ELECTRIC CARGO DOOR RESTRAINT,  5  1  821R, FORWARD CARGO DOOR  52-34-11 
SPRING - HOOK RETURN 5  1  821R, FORWARD CARGO DOOR  52-34-20 
SWITCH - FWD CARGO DOOR CONTROL, M710  7  1  122ARR, EXT FWD CARGO DOOR CONT  52-34-10 
SWITCH - FWD CARGO DOOR, S787  1  821R, FORWARD CARGO COMPARTMENT  * 
SWITCH - DOOR CLOSE, YAAS07 3  1  821R, FORWARD CARGO DOOR  52-34-09 
S301 SWITCH - FORWARD CARGO COMPARTMENT - DOOR UP, 2  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - HOOK CLOSE, YAAS08  3  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - HOOK POSITION, YAAS05  5  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - LATCH CLOSED, YAAS04  3  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - LATCH OPEN, YAAS10  7  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - MASTER LATCH LOCK, YAAS02  3  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - FWD MIDSPAN LATCH OPEN, YAAS06  2  1  821R, FORWARD CARGO DOOR  52-34-09 
SWITCH - AFT MIDSPAN LATCH OPEN, YAAS09  2  1  821R, FORWARD CARGO DOOR  52-34-09

 * SEE THE WDM EQUIPMENT LIST
Forward Cargo Door - Component Index
Figure 101 (Sheet 1)

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 ú  03  Page 101
 ú  Oct 10/90 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
AFT CARGO DOOR
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
ACTUATOR - ROTARY HOOK, YABB01  4  1  822R, AFT CARGO DOOR  52-34-07 
ACTUATOR - ROTARY LATCH, YABB02  4  1  822R, AFT CARGO DOOR  52-34-06 
M453 POWER UNIT - LIFT MECHANISM - AFT CARGO DOOR,  2  1  822R, AFT CARGO COMPARTMENT 52-34-02 
YABJB1 BOX - JUNCTION - LOWER CARGO DOOR - AFT,  1  1 822R, AFT CARGO DOOR  52-34-05 
CIRCUIT BREAKERS - 6  AFT CARGO COMPT, P59 
AFT CARGO DOOR POWER UNITS, C815  1  * 
CIRCUIT BREAKERS - 6 117AL, MAIN EQUIP CTR, P414 
CARGO DOOR CONTROL AFT, C288  1  414F16  * 
DOOR - CARGO, 822R  6  1  822R, AFT CARGO DOOR  52-34-01 
DOOR - PRESSURE RELIEF, 822BR,822ER  2  2  822R, AFT CARGO DOOR  52-34-04 
HANDLE - MASTER LATCH LOCK  7  1  822R, AFT CARGO DOOR  52-34-12 
　
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