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747-400
MAINTENANCE MANUAL

ISOLATION
PRESSURE
RELAY, R1104

SYSTEM CONNECTOR
(BELOW ELECTRICAL CONNECTOR)

PRESSURE PROBE
Pressure Switch and Isolation Relay
Figure 507

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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
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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

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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:
　
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