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 NOTE:____ You will need to open and close the door several
 times during this step.
 (d)  Turn the switch plunger two more turns counterclockwise to get
 sufficient overtravel.
 (e)  Do a test of the upper deck crew service door warning switch.
 1)  Close and latch the door.
 2)  See that the message DOOR R UPR DK does not show on EICAS.
 3)  Open the door.
 4)  See that the message DOOR R UPR DK shows on EICAS.
 5)  Close and latch the door.

 S 825-088
 (12)
 Adjust the warning switch on the overhead hatch (Fig. 506):

 (a)  
Open the panel in the ceiling adjacent to the hatch to get access to the switch.

 (b)  
Move the switch in its bracket until the message HATCH CREW O'HEAD shows on EICAS.

 (c)  
Turn the lock nuts two turns to give the switch sufficient overtravel.

 (d)  
Tighten and safety the locknuts.

 (e)  
Do a test of the warning switch on the overhead hatch. 1) Open the hatch. 2) See that the message DOOR F/D OVHD shows on EICAS. 3) Close the hatch. 4) See that the message DOOR F/D OVHD does not show on EICAS.

 (f)  
Close the panel in the ceiling adjacent to the overhead hatch.

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A
747-400
MAINTENANCE MANUAL

NOSE DOOR CONTROL
EQUIPMENT
MODULE, H122

LATCH SWITCH
(16 LOCATIONS)

SEE E
NOSE DOOR AND PRESSURE SWITCH
LIGHT MODULE, H121 AND ISOLATION RELAY SEE A SEE F
DOOR LATCH ANNUNCIATOR, H449
SEE B
DOOR CLOSED ANNUNCIATOR, H548
SEE C
NOSE CARGO DOOR
NOSE CLOSED SWITCH (2 LOCATIONS)
SEE D
Nose Cargo Door Warning System
Figure 504 (Sheet 1)

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C20041
A
747-400
MAINTENANCE MANUAL

DOOR CLOSED ANNUNCIATOR, H548

Nose Cargo Door Warning System

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C20042
A

747-400
MAINTENANCE MANUAL

SWITCH 
ACTUATOR 
DOOR CLOSED 
SWITCH 
SWITCH 
BRACKET 
NOSE CARGO  AIRPLANE 
DOOR  STRUCTURE 
BOLTS 
(4 LOCATIONS) 
MANUAL 
DOOR CLOSED SWITCH  DRIVE INPUT 
D 
LATCH 
ACTUATOR 

LATCH SWITCH
LATCH SWITCH (EXAMPLE)
E
Nose Cargo Door Warning System Figure 504 (Sheet 3)
C20033
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MAINTENANCE MANUAL

ISOLATION
PRESSSURE
RELAY, R1104
SWITCH, S110

PRESSURE SWITCH AND ISOLATION RELAY

Nose Cargo Door Warning System
Figure 504 (Sheet 4)

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