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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
12  3
4 5
6
ENTRY AND GALLEY DOORS (EXAMPLE)
NOTE: DOOR GATE LINING REMOVED
Entry Door Operation From Inside Airplane Figure 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
LEVER LATCH 
1.  PULL HANDLE  A 2.  ROTATE HANDLE CLOCKWISE 
SEE  A 
OPEN 

3 4
Entry Door Operation From Outside Airplane Figure 4
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3.  Latching Crank and Door Locking Crank
_____________________________________
 A.  Two cam rollers attached to two roller cranks bear against a cam plate. Viewing the door from inside the airplane, the left cam roller crank is splined to a latching crank. The complete crank assembly rotates in ball bearings secured in the handle mechanism housing by bearing retainers. Two separate control rods connected to each end of the latching crank connect with latch rods at the top and bottom of the door. The right cam roller crank is splined to the door cocking crank which is connected to the torque tube. The torque tube is supported on two ball bearings mounted in the handle mechanism housing. Two nuts allow vertical adjustment of the door in the door opening. Twelve bolts secure the handle mechanism housing to the door structure.
 4.  Latch Assembly
______________
 A.  Latch rollers (Fig. 1) at the ends of the latch rods engage with latches mounted on the door jambs. The upper and lower latch rods have control rods connected to the upper and lower gates respectively. The gates are mounted at the top and bottom of the door with piano-type hinges with diaphragm seals to prevent pressurization leaks. Stop rods at both ends of each gate prevent distortion of the gates when the cabin is pressurized.
 5.  Upper Hinge Assembly
____________________
 A.  The upper hinge arm (Fig. 1) is bolted to the hinge pin which rotates in plain bushings in the upper hinge support. The hinge pin is secured to the torque tube. A guide arm is connected with a bearing to the upper hinge support. The other end of the guide arm contains a spring-loaded guide arm roller that carries two guide arm roller bushings which operate in S-shaped tracks in the roller guide plates. A hole in the top guide plate allows engagement of a latch pin which is manually released by a stowing latch lever. The upper spigot at the end of the torque tube connects the radius link and the upper hinge arm to the roller guide plates.
 B.  The latch lever holds the door in its open position and has these parts:
 (1)  
a latch lever

 (2)  
a trigger (if installed)

 (3)  
a spring-loaded latch pin.

 C.  
The latch pin is installed concentrically within the guide arm roller and extends above the roller bushing. The pin is further extended by spring action into a hole in the roller guide plate when the door reaches the stowed open position.

 D.  
AIRPLANES WITHOUT A LATCH TRIGGER; A collar mounted circumferentially around the guide arm roller and latch pin has two spring pins which extend from the outer periphery to engage the stowing latch lever. Another spring pin is installed through the collar, guide arm roller, and latch pin.

 E.  
AIRPLANES WITH A LATCH TRIGGER;
 Refer to the data that follows:

 (1)  
a collar mounted circumferentially around the guide arm roller and latch pin has two tangs which extend from the outer periphery to engage the stowing latch lever and stowing latch lever link. A spring pin, installed through the guide arm roller and latch pin, contacts the lower side of the collar.

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