52-31-00
 ALL  ú ú 02 Page 510 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

ISOLATION
PRESSURE
RELAY, R1104

SYSTEM CONNECTOR
(BELOW ELECTRICAL CONNECTOR)

PRESSURE PROBE
Pressure Switch and Isolation Relay
Figure 507

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-31-00
 ALL  ú ú 02 Page 511 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B26859
A
747-400
MAINTENANCE MANUAL

LATCH ACTUATOR TEST PANEL, H482

NOSE DOOR CONTROL AND LIGHTS MODULE, H121DOOR LATCH ANNUNCIATOR, H449
DOOR CLOSED ANNUNCIATOR, H548

Nose Cargo Door Control Panel
Figure 508

C16659
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-31-00
 ALL  ú ú 02 Page 512 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 3) LATCHES 1-4R
 4) LATCHES 1-4L
 5) LATCHES 5-8R
 6) LATCHES 5-8L

 E. Procedure
 S 865-202
 CAUTION: ALLOW 4 MINUTES COOLING TIME BETWEEN THE DOOR OPENING AND
_______ CLOSING. THIS WILL PREVENT THE DRIVE UNIT FROM BECOMING OVERHEATED.
 (1)  Simultaneously hold the control switches to open the door and look to see these indications:
 NOTE: When the door opens or closes it can make unusual noise when
____ the latch pins engage the spherical bearings.
 (a)  
On the EICAS display: 1) The caution message DOOR NOSE CARGO shows 2) The status message DOOR NOSE CARGO does not show.

 (b)  
On the synoptic display:
 1) The amber nose cargo door shows.

 (c)  
On the door control and lights panel:
 1) White POWER ON light comes on
 2) Green LATCHES CLOSED light goes off.

 (d)  
On the door latch annunciator panel:
 1) 16 amber NOT LCHD lights come on
 2) 16 green LATCHED lights go off.

 (e)  
On the door closed annunciator panel:
 1) 2 amber DOOR NOT CLOSED lights come on
 2) 2 green DOOR CLOSED lights go off.

 S 215-004
 (2)  
When the door is fully opened, make sure the drive unit stops and look to see these indications:

 (a)  
On the door control and lights panel:
 1) Blue DOOR UP light comes on
 2) White POWER ON light remains on
 3) Green LATCHES CLOSED light remains off.

 (b)  
On the door latch annunciator panel:
 1) 16 amber NOT LCHD lights remain on

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-31-00
 ALL  ú ú 02 Page 513 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) 16 green LATCHED lights remain off.
 (c)  On the door closed annunciator panel:
 1) 2 amber DOOR NOT CLOSED lights remain on
 2) 2 green DOOR CLOSED lights remain off.

 S 215-005
 (3)  
Release the control switches and look to see these indications:

 (a)  
On the door control and lights panel:
 1) Blue DOOR UP light remains on
 2) White POWER ON light goes off.

 (b)  
On the EICAS display:
 1) The caution message DOOR NOSE CARGO remains

 (c)  
On the synoptic display:
 1) The amber nose cargo door remains.

 S 215-162
 CAUTION: ALLOW 4 MINUTES COOLING TIME BETWEEN THE DOOR OPENING AND
_______ CLOSING. THIS WILL PREVENT THE DRIVE UNIT FROM BECOMING OVERHEATED.
 (4)  
Simultaneously hold the control switches to close the door and look to see these indications:
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 艙門 DOORS 2(10)