52-41-00
 ALL  ú ú B01 Page 9 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
The door is held in the open position when the latch pin engages the latch pin hole.The door is opened from the airplane exterior by holding the outside handle with both hands and pulling outward to clear the handle recess panel. This compresses the handle seating spring and engages the handle sleeve splines with the splines on the handle shaft. Rotating the handle 180 degrees counterclockwise operates the door mechanism to put the door into the cocked position. The handle is then returned into the recess. The centering cam on the handle sleeve ensures that the handle is centered in the recess.The door is closed from the airplane interior by depressing the door open stowing latch lever to release the latch pin.Then, the door is swung through the opening by means of the assist handle, and, when the stop pin contacts the stop plate, the door is in the cocked position. As the door is swung around from the latched open position, the inside handle automatically moves clockwise to the fully open position. Rotating the inside handle 180 degrees counterclockwise operates the door mechanism in the reverse direction and brings the door into the center of the door opening. The door centering guide engages with the centering track and guides the door into the center of the door opening, allowing the latch rollers to engage with the latches. Rotation of the latch rods operates the upper and lower gate control rods and unfolds the gates outward. The action of the latch rollers in the latches pulls the door into the door opening, compresses the seal around the edge of the door, and opens the door warning switch (Ref 52-71-00).The door is closed from the airplane exterior by depressing the door open stowing latch lever to release the latch pin.Then, swing the door through the opening by means of the assist handle. The outside handle is grasped with both hands, pulled outward to engage the splines on the handle sleeve with the splines on the handle shaft and to clear the handle recess panel, and rotated 180 degrees counterclockwise. The handle is then returned into the recess.
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 52-41-00
 ALL  ú ú B02 Page 10 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 GALLEY SERVICE DOORS - TROUBLE SHOOTING
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 1.  General
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 A.  Refer to (AMM 52-01-00/101) for general trouble shooting steps for all main entry doors.
 B.  If the galley service door is hard to operate, looseness is felt when operating the door, or door handle closing torque is high, trouble shoot door by operating door as described below to isolate trouble area.
 C.  Check clearance and gaps specified below and make any adjustments per 52-41-00, A/T.
 2.  Trouble Shoot Galley Service Door
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 A.  Operate door toward closed position and check for hard spots while door is going through cycle up to but no closing (Ref step D for last inch of closing). If a check does not reveal anything, disconnect linkages until hard spot can be found. Lubricate all moving bearings except teflon bearings.
 B.  Check for grinding noises. These can be pinpointed in a noisy area by using a plastic tube approximately 1/4 X 10 X 24 inches long held to cam at one end and search for location while someone moves door mechanism.
 C.  Check for loose bolts or elongated holes in torque tube by observation or by placing a finger on the part in question while someone operates mechanism. There should be no movement felt between torque tubes and cranks, splices, or end fittings.
 D.  When closing door during last inch of travel, follow these steps closely:
 (1)  
Door must travel parallel to opening.

 (2)  
Door latch rollers must be in latch cams before latch roller crank turns.

 (3)  
Vertical clearance of gates at top and bottom.

 (4)  
Door flushness of door skin and body skin.

 (5)  
Gate flushness at upper and lower edge of cutout.

 (6)  
Stop pins must clear stop pads by 1/2 turn.

 (7)  
Check for bottoming of latches, stop pins, or cranks in clearance holes. Use modeling clay in inspected area.
　
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