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2.  Handle Mechanism
A.  The inside handle (detail B, figure 1) is bolted to a cam plate which is splined to receive the outside handle shaft. The outside handle in a recess panel flush with the door exterior skin is attached to a handle sleeve which is splined to receive the outer end of the handle shaft. A seal, to prevent pressurization losses is located inside the handle shaft. Another seal i s positioned between the sleeve housing and the seal plate. An outside handle seating spring is retained within the handle shaft by a nut and spring retainer. A pin located inside the spring is attached to a pin retaining washer, which is clamped between the outside handle and the handle sleeve. A centering cam on the handle sleeve engages on a cam on the sleeve housing, which is attached to the handle mechanism housing.
500 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-11-0 Page 1 

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 (detail E, figure 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 o f the gates when the cabin is pressurized.
5.  Upper Hinge Assembly
A.  The upper hinge arm (detail C, figure 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 spring-loaded torque tube connects radius links and upper hinge arm to the roller guide plates.
B.  The door open stowing latch consists of a latch lever and a spring-loaded latch pin. 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. 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. The hole on either side of the guide arm roller is slotted so that manual depression of the stowing latch lever causes the collar and latch pin to be pulled down sufficiently against the spring force to clear the stop hole in the roller guide plate permitting door closing to be started.
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500  Forward Entry Door Mechanism 
Oct 20/84  Figure 1 (Sheet 1)  52-11-0 
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Forward Entry Door Mechanism  532 
52-11-0  Figure 1 (Sheet 2)  Oct 20/83 
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520  Forward Entry Door Mechanism 
May 15/73  Figure 1 (Sheet 3)  52-11-0 
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Forward Entry Door Mechanism  520 
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6.  Lower Hinge Assembly
A.  The lower hinge arm (Detail D, Fig. 1) is bolted to the hinge pin which is located in two plain bushings in the lower hinge support. A seal for pressurization, is located between the hinge pin and the hinge support. Two stop plates are mounted at the lower hinge position on the forward frame of the door opening. A radius link, including a stop pin, is located between the stop plates. The lower hinge arm is attached to the radius link and stop plates by the lower hinge spigot. A door snubber is located at the lower hinge assembly. Both ends of the snubber contain a spherical-type bearing. One end is bolted to the lower hinge support and the other end is bolted to the radius link.
　
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