(b)
Look to see if there are rigging pin holes in the hook support fittings.
(c)
Drill the rigging pin holes in the hook support fittings if it is necessary (Ref 52-34-00/801).
(d)
Adjust the rigged-closed position of the hook:
CAUTION: USE A TORQUE WRENCH WITH A DIAL INDICATOR TO FIND
_______ WHEN THE INTERNAL STOPS TOUCH EACH OTHER (FIG. 506). TOO MUCH TORQUE CAN CAUSE DAMAGE TO THE STOPS.
1) Put the hook actuator in the rigged-closed position as follows: a) Turn the hook actuator with a torque wrench to find
when the internal stops touch each other (Fig. 506). b) Then, turn the hook actuator in the other direction the number of turns shown (Fig. 506).
2) Adjust the lengths of the hook pushrods until you can install the rig pin LCD-1(7) through the rig pin hole in each hook (View A-A, Fig. 502).
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A
747-400
MAINTENANCE MANUAL
INTERNAL INTERNAL
STOPS STOPS
CONTACTED SET HOOK CONTACTED
112-114 AFT CARGO DOOR
HOOK ACTUATOR MANUAL DRIVE TORQUE WRENCH TURNS (
CLOCKWISE TO CLOSE; COUNTERCLOCKWISE TO OPEN
)
HOOK ACTUATOR DIAGRAM
NOTE: THE TURNS ARE THE NUMBER OF TURNS OF A TORQUE WRENCH IN THE MANUAL DRIVE. COUNT THE TURNS AFTER YOU FIND THE INTERNAL STOPS.
TO GET THE ACTUATOR INTERNAL STOPS AGAINST EACH OTHER, DO THESE STEPS:
1.
MEASURE THE TORQUE (M) WHILE YOU TURN THE ACTUATOR BETWEEN STOPS.
THE TORQUE MUST BE CONSTANT AT |2 POUND-INCHES.
2.
FIND THE POSITION WHEN THE TORQUE INCREASED TO 15 |5 POUND-INCHES (M + 15).
3.
TURN THE TORQUE WRENCH 1/2 TURN IN THE OPPOSITE DIRECTION.
FOR THE FORWARD CARGO DOOR, THE HOOKS ARE AT THE HOOKS RIGGED OPEN POSITION AFTER YOU TURN THE ACTUATOR 112 TURNS. FOR THE AFT CARGO DOOR, THE HOOKS ARE AT THE HOOKS RIGGED OPEN POSITION
AFTER YOU TURN THE ACTUATOR 110 TO 112 TURNS.
REFER TO THE TEXT TO ADJUST THE HOOK POSITION SWITCH
Latch and Hook Actuator Internal Stop and Rig Positions
Figure 506 (Sheet 1)
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747-400
MAINTENANCE MANUAL
INTERNAL
INTERNAL
STOPS
STOPS
SET LATCHES SET LATCH
CONTACTED CONTACTED
-1/2 TURN (M + 15)
MANUAL DRIVE CRANKING TORQUE
M
CLOSED OPEN SWITCH TO SWITCH TO CUT POWER CUT POWER
-1 0 1 2 3 91 113114115116
TURNS OF LATCH ACTUATOR MANUAL DRIVE TORQUE WRENCH
NOTE: THE TURNS ARE THE NUMBER OF TURNS OF A TORQUE WRENCH IN THE MANUAL DRIVE. COUNT THE TURNS AFTER YOU FIND THE INTERNAL STOPS.
TO GET THE ACTUATOR INTERNAL STOPS AGAINST EACH OTHER, DO THESE STEPS:
1.
MEASURE THE TORQUE (M) WHILE YOU TURN THE ACTUATOR BETWEEN STOPS.
THE TORQUE MUST BE CONSTANT AT |2 POUND-INCHES.
2.
FIND THE POSITION WHEN THE TORQUE INCREASED TO 15 |5 POUND-INCHES (M + 15).
3.
TURN THE TORQUE WRENCH 1/2 TURN IN THE OPPOSITE DIRECTION.
Latch and Hook Actuator Internal Stop and Rig Positions Figure 506 (Sheet 2)
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