(2)
Two small shims, 0.30 inch thick, 0.8 inch wide, 1.3 inch long
(3)
Spring scale, hand-type, 75 pound- minimum scale
(4)
Two suitable stands for supporting airstair
C. Prepare for Adjustment
(1)
Remove aft entry door (Ref Aft Entry Door and Airstair - Removal/Installation.
(2)
Remove handrails (Ref Aft Airstair Handrails - Removal/Installation).
(3)
Disconnect radius rod (l, Fig. 501) from programming arm.
Feb 15/79 52-14-101 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Aft Airstair Folding Mechanism Adjustment 500
52-14-101 Figure 501 May 15/69
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Adjust aft airstair folding mechanism.
(1)
Support airstair assembly in a position that will allow lower and middle segments to be cantilevered off upper segment and middle segment contacts upper segment at point B (Fig. 501). Lower segment should be clamped to middle segment near point A. Support airstair by inserting a bar through torque tube (10) and placing each end on a suitable support.
(2)
If airstair is removed and supported on a work bench, rotate program arm to position cam rollers (12) 0.06 to 1.00 inches from end of cam as shown in Section A-A. Do not support airstair on carriage. Supports for airstair must be clear of door carriage.
(3)
Disconnect forward and aft upper pushrods (4) by removing bolt at lower ends.
(4)
Release clamps and place 0.30 inch shims between middle and lower segments at points A (one each side of airstair) and clamp lower segment tightly to middle segment.
(5)
Extend pushrods (7) until loose play in all joints is snugged up (finger-tight).
(6)
Remove clamps and shims from point A. Load required to close gap at point A shall not exceed 100 pounds at end of lower segment.
(7)
Connect pushrods (4) and shorten rods until loose play in all joints is snugged up (finger-tight). Tighten all adjustment nuts 400 to 600 pound-inches.
(8)
Remove support from airstair.
(9)
Connect radius rod (1) to programming arm (11) and manually retract airstair.
NOTE: Airstair should be installed on airplane if removed (Ref 52-14-0, Aft Entry Door and Airstair).
(10)
Test aft airstair folding mechanism.
500
Jun 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-14-101 Page 503
3. Aft Airstair Folding Mechanism Test
A. Prepare for Test
(1)
Extend airstair fully.
(2)
Remove aft entry door if installed (Ref Aft Entry Door and Airstair - Removal/Installation).
(3)
Remove handrails if installed (Ref Aft Airstair Handrails - Removal/Installation).
B. Test Aft Airstair Folding Mechanism
(1)
With a spring scale hooked between lower and middle segments, pull inboard parallel to cabin floor and check that a preload of 15-30 pounds is present on the center segment bumper that rests on the hinge arm of the upper ladder (Fig. 502).
NOTE: If 15-30 pound preload is not correct, extend airstair and readjust each upper pushrod (4) equally one-half turn until preload is correct. Do not shorten rod more than two turns from initial adjustment.
(2)
With spring scale hooked to end of lower segment, pull inboard parallel to cabin floor and check for a preload of 10-60 pounds on lower segment bumper (Fig. 502).
NOTE: Do not lengthen the lower pushrod (7) when adjusting preload. The lower preload limit can be adjusted by adding washers under the lower segment bumper. They are not to exceed 0.50 inch total thickness.
(3)
Extend airstair, tighten and lockwire pushrod (7) adjustment nuts, except do not lockwire pushrod (4) until after step (6).
(4)
Retract airstair slowly using manual mode. Check that folding mechanism operates freely with no evidence of binding or twisting of the airstair assembly.
(5)
With spring scale, check preload of center stair segment bumper is 15-30 pounds as checked in step (1).
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