S 826-029
(11)
Adjust the latch or hook mechanism if it is necessary (Ref 52-34-00/501).
S 226-009
(12)
Do a check of the maximum torque that is necessary to operate the latch actuator.
(a)
Put a torque wrench into the manual drive socket of the latch actuator.
(b)
Turn the torque wrench twenty turns in the OPEN direction.
(c)
Turn the torque wrench twenty turns in the CLOSE direction.
(d)
Make a note of the torque you use to turn the actuator.
(e)
Make sure the torque is not greater than 25 pound-inches.
S 826-030
(13)
If the torque is more than 25 pound-inches, adjust the latch fittings on the cargo door sill (Ref 52-34-00/501).
S 286-031
(14)
Do a check of the hook operation (Detail B).
CAUTION:_______IN CASE THE DOOR DOES NOT OPEN, STOP IMMEDIATELY. DO NOT OPERATE THE DOOR CONTROL SWITCH. HOLDING THE DOOR CONTROL SWITCH MAY DAMAGE THE ACTUATOR. WAIT AT LEAST 1 MINUTE BEFORE SECOND ATTEMPT. IF THE DOOR STILL DOES NOT OPEN, WAIT AT LEAST 10 MINUTES BEFORE THIRD ATTEMPT.
(a)
Open the cargo door electrically.
(b)
Look at the hooks from inside the cargo compartment while the door moves.
(c)
Make sure the hooks do not get caught on the pins as the door opens.
S 826-032
(15) Adjust the hook position switch if the hook operation is not satisfactory (Ref 52-34-00/501).
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52-34-00
ALL ú ú 01 Page 610 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 726-033
(16) With the latches and hooks in the open position, do a check of the latch mechanism.
NOTE: Do the check after the actuators operate electrically.
____
(a) Put a torque wrench into the manual drive socket of the latch
actuator.
(b) Make a mark on the door to show the position of the torque
wrench handle.
NOTE:____ This position is where the actuator stops after
it operates electrically.
(c) Turn the torque wrench five turns in the CLOSE direction.
(d) Turn the torque wrench five turns in the OPEN direction.
(e) Make a note of the torque used to move the actuator.
(f) Turn the torque wrench slowly in the OPEN direction.
(g) Make sure you can turn the torque wrench 2 to 4 turns before
the latch actuator hits the internal stops.
NOTE:____ The actuator has hit the stops when the torque increases
15 pound-inches during one-half turn of the wrench.
(h) Adjust latch mechanism if it is necessary (Ref 52-34-00/501).
S 726-057
(17) With the latches and hooks in the open position, do a check of the hook mechanism.
NOTE: Do the check after the actuators operate electrically.
____
(a)
Make sure the hook has not contacted the external stops.
(b)
Put a torque wrench into the manual drive socket of the hook actuator.
(c)
Make a mark on the door to show the position of the torque wrench handle.
NOTE: This position is where the actuator stops after
____ it operates electrically.
(d)
Turn the torque wrench five turns in the CLOSE direction.
(e)
Turn the torque wrench five turns in the OPEN direction.
(f)
Make a note of the torque used to move the actuator.
(g)
Turn the torque wrench slowly in the OPEN direction.
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