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747-400 FAULT ISOLATION/MAINT MANUAL
FROM SHEET 1 (BLOCK 3)
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?
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)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 747-400 FAULT ISOLATION/MAINT MANUAL FROM SHEET 2 FROM SHEET 2 (BLOCK 7) (BLOCK 23)
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)
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
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 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
13 DOES THE GREEN "LATCHES CLOSED" LIGHT COME ON WHEN THE DOOR IS FULLY CLOSED AND LATCHED?
Nose Cargo Door Will Not Close and Latch Electrically. Other Electrical Modes Normal. Figure 104 (Sheet 4)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. A 747-400 MAINTENANCE MANUAL NOSE CARGO DOOR SYSTEM - MAINTENANCE PRACTICES 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 2
