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747-400 FAULT ISOLATION/MAINT MANUAL
FROM SHEET 1 (BLOCK 2) YES
. ONE OR MORE LATCH ACTUATORS DOORS: "NOSE CARGO DOOR OPEN-DO NOT OPERATE ELECTRICALLY ING WITH TOTALLY INOPERATIVE OR NORMALLY? LATCH ACTUATOR" (AMM 52-31-00/
SEE SHEET 3
(BLOCK 7)
Nose Cargo Door Will Not Unlatch and Open Electrically.
Other Electrical Modes Normal.
Figure 103 (Sheet 2)
C86856
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747-400 FAULT ISOLATION/MAINT MANUAL
. THE PUSH-PULL CAM ACTUATOR DOES NOT STOP UNTIL THE DOOR CONTROL SWITCH IS RELEASED?
NO
YES
9 DOES THIS CONDITION OCCUR:
. THE PUSH-PULL CAM ACTUATOR DOES NOT STOP WHEN THE DOOR CONTROL SWITCH IS RELEASED?
NO
SEE SHEET 4 (BLOCK 10)
ACTUATOR (AMM 52-31-09/401).
Nose Cargo Door Will Not Unlatch and Open Electrically.
Other Electrical Modes Normal.
Figure 103 (Sheet 3)
C86865
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747-400 FAULT ISOLATION/MAINT MANUAL
FROM SHEET 3 (BLOCK 9)
NO NO NO
30 MAKE SURE THE CIRCUIT BREAKER DOOR LIFT, C1630, IS CLOSED.
YES
HOLD THE DOOR CONTROL SWITCH IN THE "OPEN" POSITIONAND MEASURE THE VOLTAGE.
IS THERE 28V DC AT TP-5 IN THE NOSE DOOR CONTROL PANEL?
YES NO
31 DISCONNECT CONNECTOR DX53A FROM THE DRIVE UNIT AND DO A VOLTAGE CHECK.
IS THERE 115V AC BETWEEN PINS 1,2 AND 3 ON CONNECTOR DX53A AND AC GROUND?
YES
YES
11 DOES THE DRIVE UNIT FAIL
TO OPEN THE DOOR TO THE FULLY
OPEN POSITION?
NO NO
12 DOES THE DRIVE UNIT STOP
OR THE BLUE DOOR UP LIGHT COME
ON WHEN THE DOOR IS FULLY
OPEN?
YES
Nose Cargo Door Will Not Unlatch and Open Electrically.
Other Electrical Modes Normal.
Figure 103 (Sheet 4)
C86929
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747-400 FAULT ISOLATION/MAINT MANUAL
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED: 415F16, POWER DISTRIBUTION CENTER-RIGHT ON P415 715XX, NOSE CARGO DOOR POWER ON P715
NOSE CARGO DOOR WILL MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION:
NOT CLOSE AND LATCH
ELECTRICAL POWER IS ON (AMM 24-22-00/201)
ELECTRICALLY. OTHER
ELECTRICAL MODES NOTE:____ FOR THE TROUBLESHOOTING OF THE EICAS MESSAGES,
NORMAL. REFER TO FIM CMC MESSAGE INDEX.
NO
1 THE DOOR IS FULLY OPEN.
DO ALL THE AMBER LIGHTS ON THE ANNUNCIATOR PANELS COME ON?
YES NO NO
2 PUSH AND HOLD THE SYSTEM
POWER SWITCH TO THE "ON" POSI-
TION. LOOK AT THE WHITE "POWER ON" LIGHT.
DOES THE WHITE "POWER ON" LIGHT COME ON?
YES
NO
3 CLOSE THE DOOR ELECTRI-CALLY.
DOES THE DRIVE UNIT OPERATE?
YES
SEE SHEET 2 (BLOCK 4)
YES
NO
22 MAKE SURE THE CIRCUIT
BREAKER DOOR LIFT, C1630, IS
CLOSED.
HOLD THE DOOR CONTROL SWITCH IN THE "CLOSED" POSI-TION AND MEASURE THE VOLTAGE.
IS THERE 28V DC AT TP-7 IN THE NOSE DOOR CONTROL PANEL?
YES
45 REPLACE THE CONTACTOR
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