NOTE:  The adjustment for flushness at lower edge of airstair door affects the airstair door latch pin clearance. The latch pin should be extended (by closing the forward entry door) and a check should be made that there is no interference between the outboard face of the latch pin and the inboard face of the cross pin on the door (Detail B, Section A-A, Fig. 404). After making this check, the forward entry door should be opened to keep the latch pin retracted.
D.  Adjust door vertically and horizontally to center it within the door opening.
CAUTION: UNDER NO CIRCUMSTANCES SHOULD ANY MATERIAL BE TRIMMED FROM THE FUSELAGE SKIN AROUND THE DOOR OPENING.
NOTE:  The object of the vertical and horizontal adjustment is to ensure that door stop pins contact their bearing plates within a 0.3-inch diameter circle at the center of each bearing plate (Fig. 402). During these adjustments, a close watch should be kept on the gap tolerances around edges of the door outer skin (Fig. 403). In the case of a door which has been previously installed on another airplane it may be necessary to compromise between the door stop pin centering tolerances and the edge of skin gap tolerances. In such cases more material may be trimmed from certain portions of the door's edge, if necessary.
(1)  
Loosen four bolts securing lower guide fitting to its base and four bolts securing the base to the door (Fig. 402).

(2)  
Remove two flush head screws securing shim plate to lower sill of door opening (two places). Lift shim plates and remove or add shims to obtain required vertical adjustment. Replace shim plates and attaching screws.

NOTE:  The adjustment required at the two-shim plate locations may differ.

(3)  
Adjust lower guide fitting base to serrations on door, which allow vertical alignment rollers of door to rest on shim plates. Tighten four bolts securing lower guide fitting base to door.

(4)  
To obtain horizontal adjustment of door, move centering guide fitting (on lower sill of door opening) forward or aft, as required, on its serrated base. Tighten the two bolts securing centering guide fitting to lower sill and tighten the four bolts securing lower guide fitting to its base (Detail A, Fig. 401).

(5)  
Complete the horizontal adjustment by adjusting guide pin on each of the two upper guide fittings to obtain 0.02-inch nominal gap between head of pin and face of track (Fig. 405).

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52-61-500 Page 412  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/74 

E.  After completion of door adjustment, manually move door to fully open position and return to fully closed position. Check that there is no binding or interference between guide pins and door tracks during any part of travel.
F.  Lock the two guide pins by backing them off to align one of its grooves with the nearest groove in bushing and install lockspring.
G.  With door in closed position, install all four stop pins along upper edge of door and the two center stop pins along lower edge. Rotate each pin until it contacts its bearing plate.
H.  Partially open the door and install locksprings on the six stop pins by rotation each pin until one of its grooves align with nearest groove in bushing. Close the door and check that all eight stop pins contact the center of their respective bearing plate.
I.  Check that plungers of airstair door closed limit switches travel between 0.07 and 0.11 inch when airstair door closes. Adjust if necessary (Ref. 52-61-601, Adjustment/Test).
J.  Manually operate airstair door to its fully open position and check that door open limit switches actuate (indicated by an audible click) when a 0.35 to 0.50-inch dimension is obtained between end of jackscrew threads and inboard face of jackscrew nut assembly. Adjust door open limit switches if necessary (Ref. 52-61-611, Adjustment/Test).
K.  Install motor (Ref. 52-61-591, Removal/Installation).
L.  Deleted
500 
Aug 15/80  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-500 Page 413 

Forward Airstair Door Upper Guide Adjustment  500 
52-61-500  Figure 405  Nov 15/67 
Page 414 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FORWARD AIRSTAIR DOOR CARRIAGE - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1.  Remove Forward Airstair Door Carriage
A.  Open the airstair door, leaving airstair fully retracted.
B.  Open the following circuit breakers on circuit breaker panel P6:
　
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