(2)  
Install safety pins in latch fitting and guide on door frame.

M.  Close and latch both doors (Ref 52-49-31, Maintenance Practices).
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52-49-31 Page 406  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/86 

CONTROL CABIN DOOR - DESCRIPTION AND OPERATION
1. General
A.  The control cabin door provides access from the passenger cabin to the control cabin. (See figure 1.) It hinges aft from its left side. A door handle and an electric and keyed lock permits the door to be opened and closed, and locked, from either side. An emergency exit or inner door and blowout panels are provided in the control cabin door. A wide angle optical peep device in the door permits observation of the forward entry area from the control cabin. A mirror for use by the crew is attached to the upper forward side of the door.
B.  Components in the circuit for operating the electric lock on the control cabin door are shown on figure 2. The equipment consists of a door lock switch with indicator lights mounted on the aft control stand and an electric strike that receives power through the switch from a 28 volt dc circuit breaker. The strike is mounted on the partition at the door latch and is spring loaded in latched position. The minimum pull required to open the door when the strike is deenergized is 10 pounds. A shear pin on the strike is provided to withstand a 250 pound pull at the door knob.
C.  There are four blowout panels located in the control cabin door. (See figure 1.) In the event of a sudden depressurization of the control cabin the blowout panels hinge out from the door uncovering openings in the door which allows the air pressure in the control cabin and the passenger cabin to equalize. This permits the control cabin door to be safely opened. Shear pins are installed on each side of the two lower blowout panels and two shear pins are located on the upper edge of the upper panel and on the lower edge of the adjacent panel. The shear pins secure the panels in the normal closed position in the door. The pins are sheared permitting the panels to hinge out from the door by the difference in air pressure on the forward and aft surfaces of the door. A control cabin door retainer assembly restrains the upper blowout panel when the pins are sheared thus preventing an occupant in the first observer's position from being injured.
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Feb 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-51-0 Page 1 

D.  An emergency exit feature is provided in the control cabin door which permits the release and removal of the two upper blowout panels from the door. The removal of the two upper panels, which comprise an inner door, provides an emergency exit through the control cabin door. The emergency exit is used if an obstruction on the aft side of the door prevents the control cabin door from opening and thus prevents communication with the passenger cabin. The emergency exit door release handle is located on the forward side of the control cabin door between the two upper blowout panels. In an emergency the release handle is grasped and pulled forward. This movement of the handle operates a cable assembly and linkage which disengages retaining pins located on each side of the handle at the door channel and allows the release handle to move forward. As the release handle moves forward the extreme ends of the two blowout panels move toward each other which allows the shear pins to clear retaining fittings mounted on the control cabin door frame. The panels are then pulled forward of the door structure and are allowed to drop straight down to the control cabin floor. As the panels fall to the floor the ball terminal on the upper blowout panel door retainer is pulled out of its retaining slot in the panel. The panels are then free of the door structure and the emergency exit is available for use. The first observer's seat can be released from stowed position and used as a step in egress from the control cabin.
E.  The control cabin door frame and structural channels are constructed of aluminum alloy standard sheet stock materials. The blowout panels are of honeycomb core construction. The door is attached to the door frame by extruded structural hinges. A decorative finish is provided on all exposed surfaces. A seal of extruded synthetic rubber is attached around the perimeter of the door to provide a light seal.
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52-51-0 Page 2  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/67 

500  Control Cabin Door 
May 15/67  Figure 1 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-51-0 Page 3 
　
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