Electronic Equipment Compartment  500 
52-48-41  External Access Door  May 15/69 
Page 6  Figure 1 (Sheet 5) 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Supports the door when it is opened and moved upward along the inclined tracks to its stowed position. The door is attached to tracks on the lower web by flexible leaf-spring type track attach brackets (19) located near the forward and aft edges of the inner side of the door. On the inner right side of the door a spring-loaded uplatch (23, view 1, section C-C), attaches door to a latch pin on the lower web when the door is opened and pushed upward to the right 1/2 to 1 inch. If the door is allowed to roll to the left, when opened, it will disengage itself from the tracks. The upper web is located between the door tracks and is equipped with eight rollers (9, sections A-A and B-B), which permits lower web (12) to telescope under the upper web as the door moves up the tracks to a stowed position. The rollers are arranged to provide a rolling support for the upper web on the door tracks and, also, support the lower web with attached door on the upper web. Spring spool assembly
(4) is attached by support bracket (6) to fuselage structure near the upper, outboard, end of the tracks. The free end of flat spring (5) is attached to the lower web assembly. When the door is opened and pushed up and to the right, the lower web is engaged and spring spool assembly (4) assists in propelling the door into its stowed position. Stops (10) are located to limit door travel and trip lever (25, view 1, section C-C), is provided to actuate the uplatch (23), freeing the door from its outboard attachment to the lower web when the door is closed.
B.  On later airplanes, and airplanes incorporating Boeing Service Bulletin No. 52-1016, a cable attached to an angle on the lower track structure and to a spring inside the door reduces the rate of fall o f the door after it is released from the uplatch. Also, needle bearing rollers, supported by angles attached to the door, and roller guides attached to the right beam at the door opening to accept the rollers, center the door in the opening and on the door track when the door is opened and closed. A guard over the striker prevents accidental release of the door from the uplatch.
C.  The door is opened from outside the airplane by pushing trigger (22, detail A) in outer handle (17), which allows the handle to spring out from its flush position so that it may be easily grasped, and then rotating the handle counterclockwise. This action withdraws all four latch pins (13), closes the switch to energize the appropriate door warning light in the control cabin, and allows the door to be pushed up and to the right. As the entire door is pushed up, the right end of door pivots upward about track attach bracket pivot bolts (18), which are located on the left end of the door, and uplatch (23), on the right end of door, engages the latch pin on lower web. The door is then pushed up and to the right on the inclined tracks to its stowed position. Very little effort is required to push the door into stowed position as the spring spool  assembly (4) acts to counterbalance the weight of the door.
500 
May 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-48-41 Page 7 

D.  The door is closed from outside the airplane, after making sure the uplatch was engaged when the door was stowed, by pushing aft on latch pin knob (20), which releases the door from stowed position, then pulling the door and track down and to the left until it is possible to grasp the door handle. Using the door handle, the door and track are pulled down and to the left until the door track on the lower web, and striker (26), are located on the left beam at the door opening. Trip lever (25) then trips uplatch (23), releasing the door from the lower web and allowing it to be pulled down into the door opening. When the door is properly seated, a downward pull on the door handle will cause the door to compress the door pressure seal. A clockwise rotation of the handle pushes the four latch pins (13) into engagement and opens the door warning switch. With door locked in closed position, the handle must then be pushed back into its flush position in its recess in the exterior skin of the door.
500 
52-48-41 Page 8  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/69 

ELECTRONIC EQUIPMENT COMPARTMENT EXTERNAL ACCESS DOOR -REMOVAL/INSTALLATION

1. General
A.  If the electronic equipment compartment external access door is removed and installed on the same airplane, without disturbing door adjustments, it may be installed in accordance with par. 3 of the following procedures.
B.  If the door to be installed is a new unit, it must first be prepared as described in Electronic Equipment Compartment External Access Door - Adjustment/Test.
　
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