No. 3 and 6 Lockpin Switch Adjustment 520
52-32-141 Figure 501 Nov 15/76
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
GALLEY SERVICE DOORS - DESCRIPTION AND OPERATION
1. General
A. The forward and aft galley service doors are located on the right side of the fuselage approximately opposite the forward and aft entry doors (Fig. 1). An upper and a lower hinge assembly supports each galley service door on its forward edge in the door opening. Each door may be closed or opened from inside or outside the airplane. Since the forward and aft galley service doors are similar in design and operation, only the aft door will be described in the following paragraphs.
B. The door is opened by manually operating the centrally located handle, which causes an internal mechanism within the door to release roller latches on the door from latch fittings on the door jambs, folds the gates inward, and moves the door to its most inward position. The door is then manually swung through the door opening and stowed in the open position by the engagement of a latch pin in a hole in the upper guide plate at the upper hinge.
C. The door is guided during the final closing operation by a centering guide attached to the center of the aft edge of the door engaging with a centering track located on the aft frame of the door opening. (Detail A, Fig. 1) When the door is in the closed position and the passenger cabin is pressurized, door stops mounted on the forward and aft frames of the door opening contact adjustable door stop pins attached to the forward and aft edges of the door. The door stops transmit the pressurization loads on the door to the fuselage structure surrounding the door, and prevent excessive deflection of the seal attached around the entire edge of the door. A flap is located at both the upper and lower hinges in cutouts in the body skin and is attached by spring-loaded hinges to the forward frame of the door opening. The flap covers the gap between the hinge link and body skin around the hinge cutouts when the door is in the closed position. Water drains are provided at the upper and lower hinge locations and along the lower edge of the lower gate. A proximity switch, attached to the door and door frame, is in circuit with the door warning system. Refer to Section 52-71-0. Assist handles are provided to give additional control during the door operating cycle.
D. A removable body skin panel is located between the upper and lower hinge attach points which provides access to the hinge torque tube for overhaul purposes.
500
Feb 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-41-0 Page 1
2. Handle Mechanism
A. The inside handle (Detail B, Fig. 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 sleeve housing. Another seal is 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 located 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.
3. Latching Crank and Door Locking Crank
A. Two cam rollers attached to two roller cranks (Detail B, Fig. 1) 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, 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. The adjustable door stops are also shown on detail E, Fig. 1.
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