C. Position torque tube in structure by inserting through upper or lower hole in structure.
D. Raise and lower torque tube and install sleeves.
E. Insert bolts through sleeves, install washers and nuts.
F. If required, drill hinge link pin and/or torque tube to match fastener holes in sleeve.
(1)
Clamp upper and lower hinge links so that they are flush with airplane external skin.
(2)
Drill two 0.234-inch diameter holes through sleeve and torque tube and/or sleeve and hinge link pin. Ream holes to a finished size of 0.2500 +0.0005 inch.
(3)
Insert bolts through sleeve, install washers and nuts.
NOTE: Final alignment of torque tube upper and lower hinge links is made by adjusting snubber during door installation.
G. Check that sleeve fasteners clear structure when torque tube assembly is rotated. If necessary, trim any fastener threads to provide clearance.
H. Install access panel removed to obtain access to torque tube.
I. Install door (Ref 52-13-0, Removal/Installation).
500
52-13-41 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 01/75
500 Aft Entry Door Structure Torque Tube Installation
Nov 01/75 Figure 401 52-13-41
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AFT ENTRY DOOR AND AIRSTATR - DESCRIPTION AND OPERATION
EFFECTIVITY
Airplanes with Aft Airstair
1. General
A. The aft entry door and airstair is designed to permit rapid access to or from the aft end of the passenger cabin. The aft airstair installation consists of the following major assemblies.
(1)
Aft airstair
(2)
Aft entry door
(3)
Drive mechanism
(4)
Controls
B. The aft entry door and airstair are a self-contained mechanism, which provides entry into the aft section of the passenger cabin. In the stowed position, the airstair is folded inboard of the aft entry door. (See figure 1.) The entry door is attached directly to the upper segment of the airstair. Before the door is opened, an unlatching mechanism unlatches and lifts the door inward and upward, thus enabling the drive mechanism to be actuated to rotate the airstair and door outward. The airstair rotates around a hinge point at approximately floor level. As the airstair and door rotate, a programming arm unfolds the airstair. The airstair is completely extended when it is approximately in the horizontal position in relation to the cabin floor. The airstair continues to rotate downward until it contacts the ground. The entry door is then located beneath the upper segment of the airstair.
2. Aft Entry Door
A. The aft entry door is an outward opening plug-type door. The door is located on the left side of the airplane forward of the rear pressure bulkhead. The entry door is attached to the upper segment of the airstair and mechanically linked to the programming arm on the airstair. Unlatching and latching the door is accomplished by actuating the control handle on the console control panel or by the external handle. Outward movement of the door is controlled by movement of the airstair. The door moves on rollers in carriage tracks attached to the upper segment.
Aug 15/71 52-14-0 Page 1
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Aft Entry Door and Airstair Equipment Location 500
52-14-0 Figure 1 Feb 15/68
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. The door is an aluminum structure with outer and inner skins internal webs and stiffeners. A continuous silicone ribbon seal mounted on the door opening reveal prevents loss of cabin pressure through the door edges. Pressurization loads on the door are transmitted to the fuselage by adjustable stop fittings. These fittings bear against corresponding stop pads attached to fuselage structure surrounding the door. The door is positioned in the opening by cam fittings on the door, which engage cam rollers attached to the body frame.
3. Aft Airstair
A. The aft airstair is a three-segment, folding metal airstair, which is connected through the hinge support fitting to floor structure in the area of the aft entry door. (See figure 1.)
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