(3)
Open airstair circuit breakers on panel P6. Disconnect airstair electrical connector (Fig. 501).
(4)
Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position.
(5)
Disconnect carriage step control actuating rod from forward and aft side of top step to allow ease of movement of carriage.
NOTE: Do not adjust actuating rod.
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Feb 20/92 52-61-201 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Slow-Down Operating Limit Switch Adjustment 500
52-61-201 Figure 501 Nov 15/68
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(6)
Extend carriage manually until switch ramp actuator is directly above switch and adjust switch roller so roller is just touching ramp.
(7)
Connect ohmmeter across switch and check that switch is open.
(8)
Adjust jamnuts so switch plunger is depressed 0.16 0.02/- 0.02 inch by ramp and check that switch is closed.
(9)
Manually move carriage inboard and outboard several times to check that switch maintains adjustment.
(10)
Disconnect voltohmmeter and install lockwire on switch.
(11)
Connect carriage step control actuating rod to forward and aft side of top step.
(12)
Move carriage to retracted position and insert rig pin through index slot in aft rail and into index hole in carriage beam (Fig. 501).
(13)
Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position and install safety wire on lever.
(14)
Remove rig pin and connect airstair connector.
(15)
Extend airstair fully using NORMAL power.
(16)
Check that extension speed of carriage and upper ladder is reduced approximately one-half when slow-down switch actuates - just prior to rotation of upper ladder.
(17)
Retract airstair and install drain pan if removed.
(18)
Extend airstair and install drain pan attachment fittings if removed.
500
Feb 20/92 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-201 Page 503
FORWARD AIRSTAIR SPEED-UP LIMIT SWITCH -REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. Remove Forward Airstair Speed-up Limit Switch
A. Gain access to airstair area through electronics access door and remove drain pan if installed.
CAUTION: DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OR USE SWING ARM AS HANDHOLD OR SWING ARM MAY BE DAMAGED.
NOTE: Temporary access can be attained by partially retracting airstair.
B. Extend airstair and open airstair circuit breakers on panel P6.
WARNING: DO NOT OPERATE THE AIRSTAIR WHEN THESE CONDITIONS OCCUR:
-YOU WILL OPERATE THE AIRSTAIR MORE THAN 3 CYCLES IN 20 MINUTES -THE WIND IS MORE THAN 40 KNOTS -THERE IS NO SUPPORT UNDER THE END OF THE AIRSTAIR WHEN THE
AIRPLANE IS ON JACKS -THE FORWARD ENTRY DOOR IS OPENED FULLY -THE AREA IS NOT CLEAR OF PEOPLE OR EQUIPMENT.
IF YOU OPERATE THE AIRSTAIR WHEN THESE CONDITIONS OCCUR, YOU CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
C. Disconnect airstair electrical connector P1 on aft rail.
D. Disconnect electrical wiring from switch.
E. Remove locknuts and switch (Fig. 401).
2. Install Forward Airstair Speed-up Limit Switch
A. Position switch on mounting bracket with switch plunger up.
B. Adjust locknuts on switch so switch plunger is lowered from switch actuating arm as far as threads permit.
C. Adjust speed-up limit switch (Ref 52-61-211 A/T).
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Feb 20/92 52-61-211 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Speed-up Switch Installation 500
52-61-211 Figure 401 Aug 15/69
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