(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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-21-00
 ALL  ú ú 01 Page 601 ú Feb 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-21-00
 ALL  ú ú 01 Page 602 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-21-00
 ALL  ú ú 01 Page 603 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-21-00
 ALL  ú ú 01 Page 604 ú Feb 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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.
　
中國航空網 www.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 1(137)