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EFFECTIVITY
Airplanes with Aft Airstair
1.  General
A.  The aft airstair emergency extension mechanism may occasionally require adjustment. Adjustments are made to the cam follower assembly of the lockout components and the adjustable latch of the torsion bar and latch assembly. Excessive pressure required to move the console handle to the emergency position or oscillation of the door when in the retracted position may be an indication of the need for adjustment of the torsion bar latch. The torsion bar and latch assembly are locked in place when the airstair is operated normally. Failure of the torsion bar and latch assembly to be locked may be an indication of the need for adjustment of the cam follower and lockout assembly (Fig. 501). The emergency extension mechanism will also require adjustment whenever the airstair is replaced.
B.  Operating the emergency extension mechanism releases the torsion bar latch. The torsion bar then drives the aft airstair and door outward and allows the airstair to free fall until the airstair begins to unfold. Manual assistance is required to lift the lower airstair segment outward; then the airstair will extend completely. The emergency extension mechanism must be armed after each emergency extension.
2.  Emergency Extension Mechanism Adjustment
A.  Torsion Bar Latch Assembly Adjustment
(1)  
Prepare for Adjustment

(a) 
 Extend airstair.

(b)  
Rotate the roller arm (14) to the SET position as engraved on the roller (Fig. 501).

NOTE: Pull out on spring behind roller arm to release tension.

(c)  
Retract airstair and place console handle in latched position.

(d)  
Remove left panel from aft bulkhead of aft cargo compartment for access.

 

(2)  
Adjust Torsion Bar Latch Assembly

(a)  Adjust the adjustable latch (10) to obtain 0.020 to 0.040 inch between the latch face and the actuating arm (11).
Oct 20/91 52-14-21 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Emergency Extension Mechanism Adjustment  500 
52-14-21  Figure 501 (Sheet 1)  Feb 15/69 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Emergency Extension Mechanism Adjustment 
Jan 15/71  Figure 501 (Sheet 2)  52-14-21 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(b)
Extend airstair in normal mode.

(c)
Retract airstair and place console handle in latched position.

(d)
Check measurements made in step 2(a) and readjust if necessary.

(e)
Manually or electrically extend airstair.

(f)
Rotate roller arm (14) to the NORM position as shown on roller arm.

(g)
Retract airstair.

B. Lockout Assembly Adjustment
(1)
Equipment and Materials

(a) Rigging Pin, 3/16 inch diameter, 3-1/2 inches long

(2)
Adjust Lockout Assembly

(a)
Retract and latch airstair.

(b)
Insert rigging pin in baseplate (15). (See view 2, figure 501.)

NOTE:  Lockout assembly should be pivoted outboard. Rigging pin prevents accidental pivoting of assembly inboard.

(c)
Remove nut and washer (8) on end of lockout crank shaft (4).

(d)
Remove cam follower (3).

(e)  
Remove splined eccentric (7) and place cam follower (3) back on eccentric (7).

(f)  
Place splined eccentric (7) and cam follower (3) against adjustment plate (5) and end of lockout crank shaft (4). Rotate the splined eccentric until 0.005 to 0.030 gap is obtained between the cam follower and the return cam. (See detail A, figure 501.) Press eccentric into splined adjustment plate and push cam follower onto lockout crank shaft.

(g)  
Replace washer and nut.

(h)  
Torque nut 50 to 70 inch-pounds.

(i)  
Remove rigging pin.

 

500 
52-14-21 Page 504  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/68 

3.  Emergency Extension Mechanism Test
A.  Test Emergency Extension Mechanism
(1)  
Arm emergency extension mechanism. Refer to Aft Airstair Emergency Extension Mechanism - Maintenance Practices.

(2)  
Attach a spring scale to the stair approximately 60 inches above the stair hinge line.

(3)  
Move control handle to emergency extend position and check that the force required to restrain the door from opening exceeds 50 pounds.

(4)  
Complete emergency extension and move control handle to unlatched position.
　
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