(2)  
Engage carriage drive pinions by moving carriage pinion disconnect lever (2) to locked position and install safety wire on lever.

(3)  
Remove rig pin and connect airstair electrical connector (3) to receptacle.

(4)  
Close forward airstair system circuit breakers on circuit breaker panel P6 and close forward airstair door.

2.  Forward Airstair Carriage Step Actuating Mechanism Test
A.  Equipment and Materials
(1)  Rig pin - 0.2480 (+ 0.0005/-0.0010) inch diameter by 2.50 inches long
B.  Prepare for test
(1)  
If installed, remove drain pan per par. 1.B.(1).

(2)  
Open airstair circuit breakers on panel P6. Disconnect airstair electrical connector (2). (Fig. 501)

(3)  
Disengage carriage drive pinions by moving carriage pinion disconnect lever (2) to unlocked position.

500 
Feb 20/92  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-131 Page 505 

C.  Test Carriage Step Actuating Mechanism
(1)  
With carriage in retracted position check that carriage step (7) lies flush with top of forward and aft carriage beams.

(2)  
Manually move carriage outboard to the fully extended position. Insert rig pin through index hole (1) and into index slot in carriage beam.

(3)  
Check that carriage step is fully elevated by observing that forward and aft fittings (8) are perpendicular to carriage beams within the tolerance shown and that forward and aft stops

(13) are contacting lower surface of fittings (8).

(4)  
Remove rig pin and manually move carriage inboard until actuating mechanism has lowered carriage step.

(5)  
Check that carriage step lies flush with top of forward and aft carriage beams.

D.  Restore Airplane to Normal
(1)
Manually move carriage to retracted position and insert rig pin through retract index slot

(6) and into retract index hole in aft beam of carriage.

(2)  
Engage carriage drive pinions by moving carriage pinion disconnect lever (2) to locked position and install safety wire on lever.

(3)  
Remove rig pin and connect airstair electrical connector (3) to receptacle.

(4)  
If required, install drain pan through airstair door opening inside of fuselage. (Fig. 502)

(5)  
Close forward airstair system circuit breakers on circuit breaker panel P6.

(6)  
Extend airstairs and install drain pan attachment fasteners. Install drain pan access hatch and connect drain hose.

500 
52-61-131 Page 506  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/72 

FORWARD AIRSTAIR RETRACT LIMIT SWITCHES - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A.  The normal system retract limit switch (S5) and standby system retract limit switch (S6) are identical switches which are removed and installed in the same manner. Therefore, the following procedure is applicable to both switches.
2.  Remove Forward Airstair Retract Limit Switches
A.  Gain access to work area through electronic compartment access door.
B.  Open airstair circuit breakers on panel P6 and disconnect airstair electrical connector (Fig. 401).
CAUTION:  DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OR USE SWING ARM FOR HANDHOLD OR SWING ARM MAY BE DAMAGED.
C.  Disconnect electrical wiring from retract limit switch.
D.  Remove retract limit switch from mounting bracket.
3.  Install Forward Airstair Retract Limit Switches
A.  Position retract limit switch on mounting bracket with switch roller up (Fig. 401).
B.  Adjust locknuts so that switch is lowered away from switch actuating ramp as far as threads permit.
C.  Adjust retract limit switch (Ref 52-61-141, Adjustment/Test).
5C8
Feb 20/84 52-61-141 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Forward Airstair Retract Limit Switches Installation  500 
52-61-141Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/67 

FORWARD AIRSTAIR RETRACT LIMIT SWITCHES - ADJUSTMENT/TEST
EFFECTIVITY
Standard Passenger Airplanes
1.  Forward Airstair Retract Limit Switches Adjustment
A.  General
(1)  The normal system retract limit switch (S5) and standby system retract limit switch (S6) are identical switches and are adjusted to their proper operating limits in a similar manner. Therefore, the following procedure is applicable to both switches with exceptions noted.
　
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