(9)
Snubber may be bottoming out. Check travel of snubber piston.
(10)
Binding of guide arm in guide cams at upper hinge may be due to misaligned cam plates. Check by moving the guide arm (one end removed from door) through the cams and check for alignment of guide arm with centerline of hinge plane. Misaligned cam plates can cause the guide arm to work hard on one cam plate and force it to come loose. Cam plates may be aligned but rotated. This will cause the door to have extra travel in either the cocked position or the open position. It may not cause the handle loads to be high.
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NOTE: Misaligned guide cams would probably only occur after cam replacement due to tolerances in cam installation boltholes.
E. Excessive torque problems (Ref 52-41-0 A/T, for door operating torque limits).
(1)
Operate door and check for interference with body structure. Look for scraped paint as an indication. To verify, place a strip of paper over suspected area and close door. Paper should pull out without tearing.
(2)
Check seal plane for smoothness and excessive build-up.
(3)
Check stop gaps. If there is evidence of excessive bottoming out, readjust. Also recheck gate stops.
(4)
Make sure the bearings in the upper and lower gate pushrods move freely.
(a) Lubricate the bearings if they cannot move (Ref 12-25-41/201).
(5)
Check snubber for bottoming out.
(6)
Check for door entering opening evenly at forward and aft latches during last inch of travel. Adjust guide arm if required.
(7)
Check misfair. If a latch cam can be moved inboard without exceeding misfair tolerances, torque can be reduced. Stops must be reset if adjustment is made. Also, shortening the gate control rods will reduce torque.
(8)
Check for latch cam rollers entering latch cams before roller arms begin to rotate. Adjustment to the horizontal control rod at handle cam can reduce torque. Recheck exterior handle stowage force.
(9)
If lining is installed, check for interference of lining and body structure or trim. Check with a strip of paper as in step (1).
(10)
Check for smooth operation, without jerks or bumps, at handle cam. High spot in cam can cause excessive torque.
(11)
Check for clearance between latch cam rollers and outboard face of cam. Throughout operation of normally operating door, roller should not touch outboard face of cam. This contact can cause high torque.
F. Check for excessive misfair (Ref 52-41-0 A/T for allowable misfair).
(1) Excessive misfair will often result from adjustments to lower torque tube. If adjustments to latch cams or gate rods to improve fair result in excessive torque, trouble shoot per item A above.
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G. Trouble shoot problem of door handle not staying latched in flight or handle moves during taxi:
(1) Check for clearance between latch roller and bottom of latch cam. Improper clearance indicates door overcenter out of adjustment. Adjust for soft unlatching per 52-41-0, Adjustment/Test.
H. Trouble shoot excessive handle stowage force (Ref 52-41-0, Adjustment/Test for allowable handle stowage force)
(1)
Check adjustment of handle cam horizontal control rod. Lengthening the rod will reduce the handle stowage force. If adjustment is made recheck roller entrance to latches and handle torque.
(2)
Check for proper handle shaft lubrication.
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GALLEY SERVICE DOOR - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Corrosion Preventive Compound . MIL-C-16173, Grade 2 (Ref 20-30-21)
B. Safety Barrier, Entry and Galley Doors . 4PRE50-7945, (or Warning Strap)
C. Organic Corrosion Inhibiting Compound . BMS 3-23 (Ref 20-30-21)
2. Remove Galley Service Door
NOTE: Illustrations shown in this section are for aft galley service door and are typical for forward galley service door.
A. Remove door lining and insulation panels (Ref 52-41-31, Galley Service Door Lining and Insulation).
B. Rotate door to a position at approximately 90 degrees to airplane exterior and provide adequate support for door.
C. At upper hinge, remove bolt (2, Detail A, Fig. 401) attaching hinge arm (5) to hinge link (1).
D. Disconnect guide arm (10) from door by removing four bolts securing attach fitting (6) to hinge support (7).
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