(o)  
Connect voltohmmeter across terminal Y1 on relay K2 (3, Fig. 501) and pin 17 of airstair electrical connector (2) to check standby extend limit switch S4 (Fig. 502). Adjust locknuts on switch S4 until switch just opens.

(p)  
Remove rig pin and move carriage inboard then slowly outboard; index holes should be aligned when switches actuate. Check by inserting rig pin.

(q)  
After adjustment, check that switches actuate when rollers are positioned on ramp within limits shown on detail A.

(r)  
Remove rig pin and adjust slow-down-operating switch. Refer to 52-61-201, Adjustment/Test.

(s)  
Adjust speedup limit switch. Refer to 52-61-211, Adjustment/Test.

(t)  
Move carriage inboard and outboard several times to assure that all switches maintain adjustment. Safety wire all switches.

(u)  
Install carriage step control actuator to left end of forward and aft rail, if removed earlier, and check that carriage step elevates when carriage is moved to extended position.

(v)  
With airstair in fully retracted position, insert rig pin in index slot (5, Fig. 501) and engage carriage drive pinions by moving carriage pinion disconnect lever to locked position. Safety wire the lever.

(w)  
Remove voltohmmeter and rig pin and connect airstair electrical connector (2,  Fig. 501).

(x)  
Reinstall drain pan below airstair, if removed, and close forward airstair circuit breakers on panel P6.

(y)  
Extend airstair to gain access through drain pan hatch to install drain pan attachment fasteners. Install fasteners. Install drain pan hatch and connect drain hose to drain fitting.

500 
Aug 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-0 Page 502A 

52-61-0  Forward Airstair Drain Pan Access 
Page 502B  Figure 501A BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  500 Aug 15/72 

525 
Aug 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-0 Page 503 

Extend Limit Switch Adjustment  525 
52-61-0  Figure 502  Feb 15/73 
Page 504 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

CAUTION:  DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OR USE SWING ARM AS HANDHOLD OR IT MAY BE DAMAGED.
NOTE: Temporary access can be attained by partially extending airstair.
(z)  Adjust stops on forward and aft handrail support arms so the handrails will latch
easily.
(aa) Retract airstair and close airstair door if it is not being adjusted.

C.  Forward Airstair Door Adjustment
(1)  Adjust Forward Airstair Door
(a)  
With airstair door fully open and airstair fully retracted, open the forward airstair circuit breakers located on circuit breaker panel P6.

(b)  
Remove standby motor from door actuator assembly. Refer to 52-61-591, Forward Airstair Door Standby System Motor - Removal/Installation.

CAUTION:  STANDBY AND NORMAL MOTOR REMOVAL/INSTALLATION PROCEDURES ARE NOT THE SAME. ALWAYS USE THE CORRECT PROCEDURE.
501 
Aug 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-0 Page 505 

Door Open Limit Switches Adjustment  500 
52-61-0  Figure 503 (Sheet 1)  May 15/67 
Page 506 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

525  Door Open Limit Switches Adjustment 
Nov 01/73  Figure 503 (Sheet 2)  52-61-0 
Page 507 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(c)  
Using a 3/8-inch socket, obtain dimension between end of jackscrew threads and inboard face of nut assembly shown in section A-A Fig. 503, by rotating actuator manual drive.

(d)  
Loosen lockscrew on inboard edge of switch operating arm of both switches. (See detail A, Fig. 503.)

(e)  
Turn worm gear of each switch arm to drive arm against actuator bar of carriage until each switch actuates (indicated by an audible click).

(f)  
Tighten and safety wire lockscrew of each switch.

(g)  
Loosen locknuts on door closed limit switches S207 and S208 and move switches as far outboard as their threads permit and tighten locknuts. (Fig. 504)

(h)  
Apply a lump of molding clay, or similar substance, to outboard face of each plate on door, which actuates switches.

(i) Using a 3/8-inch socket, close airstair door by rotating actuator manual drive (Fig. 503) and observe the following as door approaches the closed position: 1) Observe relationship between crosspin on door latch fitting and end of door latch pin protruding through doorsill. (Fig. 504) Stoop turning manual drive when crosspin appears to have moved outboard of latch pin, or when an outside observer signals that exterior of door is flush with surrounding fuselage skin.
　
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