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 B.  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 (Fig. 4, step 1). This compresses the handle seating spring and engages the handle sleeve splines with the splines on the handle shaft. Rotating the handle 180 degrees clockwise operates the door mechanism as described in par. 9.A., bringing 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 swung through the opening until the stop is contacted and is latched in the open position by the latch pin engaging the latch pin hole (step 4).
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737-300/400/500MAINTENANCE MANUAL
 C.  The door is closed from the airplane interior by depressing door open stowing latch lever which releases the latch pin. The door is swung through the door opening by means of the assist handle and is permitted to "fall" into the opening until stopped by the door snubber. 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 counterclockwise to the fully open position, as described in par. 9.A. Rotating the inside handle 180 degrees clockwise operates the door mechanism in the reverse direction to that described in par. 9.A., and brings the door into the center of the door opening. The door centering roller 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 proximity switch (Ref 52-71-00).
 D.  The door is closed from the airplane exterior by depressing the door open stowing latch lever and swinging the door through the door opening by means of the assist handle. The outside handle is grasped with both hands, pulled outward to clear the handle recess panel, and rotated 180 degrees counterclockwise. The handle is then returned into the recess.
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737-300/400/500MAINTENANCE MANUAL
 FORWARD ENTRY DOOR - TROUBLE SHOOTING
_____________________________________
 1.  General
_______
 A.  Refer to (AMM 52-01-00/101) for general trouble shooting steps for all main entry doors.
 B.  Do the trouble-shooting procedure to the door if you have these
 conditions:

 (1)  
the entry door is not easy to operate

 (2)  
the door feels loose when you move it

 (3)  
the handle force to close the door is high.

 (4)  
the latch lever does not move freely.

 (5)  
Noise at the upper or lower hinge door flap assembly.

 C.  
If necessary, do the steps in 52-11-00/501 to adjust the door.

 2.  Trouble Shoot Forward Entry Door
________________________________
 A.  Procedure
 (1)  Do a check for hard spots while you move the door to the almost closed position and back.
 NOTE: The door should stop an inch from the fully closed position.
____
 (a)  
If you find a hard spot but cannot locate it, disconnect linkages and move the door until you locate the hard spot.

 (2)  
Do the steps in 12-25-21/301 to lubricate the door.

 (3)  
Do a check for grinding noises.

 (a)  
You can use a 1/4 X 10 to 24 inch long plastic tube to find the location of the noise.

 NOTE: Hold the one end of the plastic tube to the cam and
____ the other end to your ear. Listen for the noise while someone moves the door mechanism.
 (4)
　
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