S 215-135
(6)
Make sure it does not take more than 15 seconds to fully open all the latches.
S 865-136
(7)
Turn the latch selector switch on the latch actuator test panel to the 8L position.
S 215-137
(8)
Push the LATCH OPEN TEST switch and look to see the green LATCH OPEN light comes on.
S 215-138
(9)
Do the test above for the 15 remaining latch positions.
L.
Push-Pull Cam Test (Fig. 502)
S 865-139
(1)
Make sure the door is fully closed and latched.
(2)
Make sure you can turn the cam rollers freely with your hand.
S 865-141
(3)
Simultaneously hold the control switches until all the latches are fully opened.
(4)
Make sure the door and the push-pull cam are fully closed.
S 715-140
S 865-142
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747-400 MAINTENANCE MANUAL
S 865-143
(5)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
On the Nose Cargo Door Power panel H122:
1) PULL UP CAM
S 865-144
(6) Simultaneously hold the control switches in the open position until the push-pull cam is fully opened.
NOTE: Use a stop watch to monitor the time that it takes to fully
____ open the push-pull cam. The door opens approximately 1.3 inches when the push-pull cam is fully opened.
S 215-145
(7)
Make sure it does not take more than 11 seconds to fully open the push-pull cam.
S 215-146
(8)
Look to see these indicatons on the door closed annunciator panel:
(a)
2 green CLOSED lights go off
(b)
2 amber NOT CLSD lights come on.
M.
Linear Actuator and Drive Unit Test (Fig. 504)
S 865-147
(1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
On the Nose Cargo Door Power panel H122:
1) DOOR LIFT
2) LATCHES 1-4R
3) LATCHES 1-4L
4) LATCHES 5-8R
5) LATCHES 5-8L
(2)
Make sure the door is fully closed and latched.
S 865-148
S 865-149
CAUTION: ALLOW 4 MINUTES COOLING TIME BETWEEN THE DOOR OPENING AND
_______ CLOSING. THIS WILL PREVENT THE DRIVE UNIT FROM BECOMING OVERHEATED.
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A
747-400
MAINTENANCE MANUAL
(3) Simultaneously hold the control switches to fully open the door.
NOTE: Use a stop watch to monitor the time that it takes to fully
____
open the door.
S 715-150
(4) Make sure each linear actuator makes the clicking noise which shows the pawl ratchet and the brake disk rotation.
NOTE: The linear actuators do not make the clicking noise when the
____ door is closing since the pawls prevent the rotation of the down-loaded brake disk.
S 215-151
(5) Make sure it takes 84 to 96 seconds to fully open the door.
NOTE: The door opens approximately 73 degrees from the fully closed
____
position.
S 215-152
(6)
Look to see this indication when the drive unit motor stops with the control switches still held in the OPEN position.
(a)
On the door control and lights panel:
1) Blue DOOR UP light comes on.
S 865-166
CAUTION: ALLOW 4 MINUTES COOLING TIME BETWEEN THE DOOR OPENING AND
_______ CLOSING. THIS WILL PREVENT THE DRIVE UNIT FROM BECOMING OVERHEATED.
(7) Simultaneously hold the control switches to fully close the door and until the drive unit stops.
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