(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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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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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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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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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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