747-400
FAULT ISOLATION/MAINT MANUAL
FROM SHEET 1
(BLOCK 3)
YES YES
NO YES
5 DOES THIS CONDITION OCCUR: 47 REPLACE THE DRIVE UNIT
. THE DRIVE UNIT DOES NOT STOP (AMM 52-31-03/401). UNTIL THE DOOR CONTROL SWITCH IS RELEASED?
NO YES
6 DOES THIS CONDITION OCCUR:
48 REPLACE THE CONTACTOR
. THE DRIVE UNIT DOES NOT STOP RELAY, R758, IN THE NOSE DOOR WHEN THE DOOR CONTROL SWITCH CONTROL PANEL (WDM 52-31-12). IS RELEASED?
NO NO
23 MAKE SURE THE CIRCUIT BREAKER PUSH-PULL CAM, C1629, IS CLOSED.
YES
HOLD THE DOOR CONTROL
SWITCH IN THE "CLOSED" POSI-SEE SHEET 3 TION AND MEASURE THE VOLTAGE.
(BLOCK 8) IS THERE 28V DC AT TP-8 IN
THE NOSE DOOR CONTROL PANEL?
YES NO
SEE SHEET 3 (BLOCK 26)
NO
YES
YES
NO
Nose Cargo Door Will Not Close and Latch Electrically.
Other Electrical Modes Normal.
Figure 104 (Sheet 2)
C86986
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A
747-400 FAULT ISOLATION/MAINT MANUAL
FROM SHEET 2 FROM SHEET 2 (BLOCK 7) (BLOCK 23)
YES YES
NO
YES
53 REPLACE THE PULL RELAY,
R757 (WDM 52-31-12), IN THE
NOSE DOOR CONTROL PANEL.
IF THE PUSH-PULL CAM ACTUATOR STILL DOES NOT OPERATE, REPLACE IT (AMM 52-31-09/401).
YES
8 DOES THIS CONDITION OCCUR:
. THE PUSH-PULL CAM ACTUATOR DOES NOT PULL THE NOSE CARGO DOOR TO THE FULLY CLOSED POSITION.
NO
YES
9 DOES THIS CONDITION OCCUR:
. THE PUSH-PULL CAM ACTUATOR DOES NOT STOP UNTIL THE DOOR CONTROL SWITCH IS RELEASED?
NO
YES
10 DOES THIS CONDITION OCCUR:
. THE PUSH-PULL CAM ACTUATORDOES NOT STOP WHEN THE DOOR CONTROL SWITCH IS RELEASED?
NO
YES SEE SHEET 4 (BLOCK 12)
NO
27 MAKE SURE THE CIRCUIT
BREAKERS FOR THE LATCHES,
C1631-C1634, ON THE NOSE DOOR
CONTROL PANEL ARE CLOSED.
HOLD THE DOOR CONTROL SWITCH
IN THE "CLOSED" POSITION AND
MEASURE THE VOLTAGE.
IS THERE 28V DC AT TP-6 IN THE NOSE DOOR CONTROL PANEL?
NO
YES
YES NO
SEE SHEET 4 SEE SHEET 4 (BLOCK 30) (BLOCK 29)
Nose Cargo Door Will Not Close and Latch Electrically.
Other Electrical Modes Normal.
Figure 104 (Sheet 3)
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C87040
A
747-400 FAULT ISOLATION/MAINT MANUAL
FROM SHEET 3 FROM SHEET 3 FROM SHEET 3 (BLOCK 11) (BLOCK 28) (BLOCK 28)
YES
YES NO
YES
NO NO
YES NO
YES
YES NO
12 DOES THIS CONDITION OCCUR: 32 _______
CAUTION
. THE LATCH ACTUATOR DOES NOT
DO NOT CRANK THE LATCHSTOP OR MAKE NOISE AFTER THE ACTUATOR WITH MORE THANOTHER LATCH ACTUATORS 8 POUND-FEET TORQUE. THIS CANSTOPPED?
CAUSE DAMAGE TO THE MANUAL NO DRIVE UNIT.
MANUALLY CRANK THE LATCH
ACTUATOR.
DOES THE LATCH PIN EXTEND?
YES
NO
13 DOES THE GREEN "LATCHES
CLOSED" LIGHT COME ON WHEN THE
DOOR IS FULLY CLOSED AND
LATCHED?
YES
Nose Cargo Door Will Not Close and Latch Electrically.
Other Electrical Modes Normal.
Figure 104 (Sheet 4)
C87058
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A
747-400 MAINTENANCE MANUAL
NOSE CARGO DOOR SYSTEM - MAINTENANCE PRACTICES
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