(a)
Do a visual check or put a finger on the part in question while someone operates the mechanism.
NOTE: You should not feel movement between the torque tubes
____ and cranks, splices, or the end fittings.
(5)
Make sure you have these conditions while you move the door from the last inch of travel to the fully closed position:
(a)
The door must be parallel to the opening.
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A 737-300/400/500MAINTENANCE MANUAL
(b) The door latch rollers must be in their latch cams before the latch roller crank starts to turn.
(6) (c) The gate clearances (top and bottom) must be within tolerance. (d) The door flushness (vertical edges) must be within tolerance. (e) The gate flushness (top and bottom) must be within tolerance. (f) The stop pins must be clear of the stop pads by 1/2 turn.Use clay to make sure these components do not bottom out:
NOTE:____ Use some vaseline on the clay surface to keep the clay off all parts.
(7) (a) latches (b) stop pins (c) cranks.Make sure the latches are not out of time with the handle cam: (a) As you close the door: 1) Make sure the door body comes inboard 0.015 inch as the latches go 10 degrees overcenter. 2) Make sure the gates stop and do not go inboard. (b) With the door closed: 1) Make sure the pushrod is aligned correctly with the crank that operates the gate.
NOTE:____ These should have a dead center alignament with the latching torque tube.
(8) (9) Make sure the snubber is not bottoming out.Do a check for guide cams that are no aligned correctly:
NOTE:____ This can be caused by bolt hole tolerances in a new cam.
(a) (b) (c) Remove the end of the guide arm from the door.Move the guide arm through the cams.Make sure the guide arm aligns with the centerline of the hinge plane.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(d)
Make sure the cam plates do not cause the guide arm to work hard on one cam plate and force the guide arm to come loose.
(10)
Do a check for rotated cam plates:
(a)
Make sure the door does not have extra travel in the cocked or the open position.
NOTE: The handle loads may not be high.
____
B. Trouble-shoot high handle torque (Ref 52-11-00/501 for usual limits)
(1)
Open and close the door.
(2)
Make sure the door does not hit the body structure.
(a)
Look for scraped paint.
(b)
Put a strip of paper over suspected area.
(c)
Close the door.
(d)
Make sure the paper does not tear when you pull it out.
(3)
Make sure the seal plane is smooth and does not have excessive build-up.
(4)
Make sure all stops pins have the correct clearance.
(a)
If a stop pin hits its stop pad, adjust it.
(5)
Make sure the bearings in the top and bottom gate pushrods move freely.
(a)
Lubricate the bearings if they cannot move (AMM 12-25-21/301).
(6)
Make sure the snubber does not bottom out.
(7)
Close the door and make sure it is parallel during the last inch of travel.
NOTE: The forward and aft latch rollers must go into their latch
____
fittings at the same time.
(8)
Make sure the door and the gates have the correct flushness.
(a)
Adjust the latch fittings inboard to decrease the seal pressure and the handle torque.
NOTE: You must adjust the stop pins after this adjustment.
____
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