(3)  
Close the overhead hatch in the crew compartment.

 S 416-004
 TASK 52-21-00-206-011
 3.  Internal Latch Mechanism - Inspection (Fig. 602)_____________________________________
 A. References
 (1)  
IPC 52-21-01 Fig. 1

 B.
Access

 (1)  
Location Zone
 221 Control Cabin, LH

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
DRAIN 
SYSTEM 
TRIGGER 
EXTERNAL 
HANDLE 
FWD 
HOUSING 
HANDLE EXTERNAL  SEE  B  INBD 
A 
TRIGGER 

INBD 
DRAINS 
FWD 
NOTE:____  THE HANDLE SHOULD BE INSTALLED SO THE 
ARROW ON THE HANDLE POINTS FORWARD 
B  WHEN THE HATCH IS LOCKED. 
Crew Compartment Overhead Hatch Drain System 
Figure 601 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE A
PAN BOLT (10 LOCATIONS)
SEE B
BOLT INTERNAL HANDLE
LATCH ROD (4 LOCATIONS) FWD
A
OPERATING SHAFT
ACTUATOR FORK (4 LOCATIONS)
BEARING
(4 LOCATIONS)

OPERATING MECHANISM  NOTE:____ THE HANDLE SHOULD BE INSTALLED SO THE
ARROW ON THE HANDLE POINTS FORWARD
B  WHEN THE HATCH IS LOCKED.
Crew Compartment Overhead Hatch Internal Operating Mechanism
Figure 602

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A
747-400 MAINTENANCE MANUAL
 (2)  
Access Panel
 839L Hatch - Control Cabin Overhead

 C.
Procedure

 S 016-005
 (1)  
Remove the acoustic pad attached to the overhead hatch.

 S 866-007

 (2)  
Open the overhead hatch.

 S 016-006

 (3)  
Remove the internal handle and the pan.

 S 216-008

 (4)  
Examine the internal parts of the latch mechanism for corrosion and damage.

 S 416-009

 (5)  
Install the pan and internal handle.

 S 866-010

 (6)  
Close the overhead hatch.

 S 416-012

 (7)  
Install the acoustic pad on the overhead hatch.

 TASK 52-21-00-716-013
 4.  Overhead Hatch Mechanisms - Operational Ckeck (Fig.602)_____________________________________________
 A. Access
 (1)  
Location Zone
 221 Control Cabin, LH

 (2)  
Access Panel
 839L Hatch - Control Cabin Overhead

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A
747-400 MAINTENANCE MANUAL
 B. Procedure
 S 866-014
 (1)  Make sure the hatch is closed and latched.
 S 016-015
 WARNING:_______MAKE SURE YOU HOLD THE HATCH. THE HATCH CAN FALL FROM THE OPENING WHEN IT IS UNLATCHED. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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