(2)
Voltohmmeter - Simpson, Model 260
C. Adjust Forward Airstair Retract Limit Switches
(1)
Open airstair door fully leaving airstair fully retracted.
(2)
Gain access to work area through electronic compartment access door.
(3)
Open airstair circuit breakers on circuit breaker panel P6 and disconnect airstair electrical connector (Fig. 501).
CAUTION: DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OR USE SWING ARM AS HANDHOLD OR SWING ARM MAY BE DAMAGED.
(4)
With airstair retracted, insert rig pin through index slot in aft rail and into index hole in carriage beam.
5C8
Feb 20/92 52-61-141 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Retract Limit Switches Adjustment 500
52-61-141 Figure 501 (Sheet 1) Feb 20/92
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Forward Airstair Retract Limit Switches Adjustment
Feb 20/92 Figure 501 (Sheet 2) 52-61-141
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(5)
Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position.
NOTE: Step (6) is applicable to adjustment of normal system retract limit switch (S5) only. Step (7) is applicable to adjustment of standby system retract limit switch (S6) only.
(6)
Connect voltohmmeter across terminal X1 on relay K1 and pin 10 of airstair electrical connector for normal system retract limit switch (S5).
(7)
Connect voltohmmeter across terminal X1 on relay K2 and pin 15 of airstair electrical connector for standby system retract limit switch (S6).
(8)
Adjust locknuts on limit switch until volt-ohmmeter indicates zero ohms.
(9)
Remove rig pin and manually move carriage outboard then slowly inboard; index holes should be aligned when switches actuate. Check by inserting rig pin.
(10)
After adjustment/check that switch actuates when switch roller is positioned on switch actuating ramp within limits shown (Detail C).
(11)
Remove rig pin, manually move carriage outboard and inboard several times to assure that switch maintains adjustment.
(12)
Install safety wire on switch and remove volt-ohmmeter.
(13)
Manually move carriage to retracted position and insert rig pin.
(14)
Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position and install safety wire on lever (Detail B).
(15)
Remove rig pin and connect airstair electrical connector (Detail A).
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52-61-141 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/92
FORWARD AIRSTAIR EXTEND LIMIT SWITCHES - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. The normal system extend limit switch (S3) and standby system extend limit switch (S4) are not identical switches; however, they are removed and installed in the same manner. Therefore, the following procedure is applicable to both switches.
2. Remove Forward Airstair Extend 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 OU T OF WAY OR USE SWING ARM AS HANDHOLD OR SWING ARM MAY BE DAMAGED.
C. Disconnect electrical wiring from extend limit switch.
D. Remove extend limit switch from mounting bracket.
3. Install Forward Airstair Extend Limit Switches
A. Position extend limit switch on mounting bracket with switch roller down (Fig. 401).
B. Adjust locknuts so that switch roller is raised away from switch actuating ramp as far as threads permit.
C. Adjust extend limit switch (Ref 52-61-151, Adjustment/Test).
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