Forward Airstair Extend Limit Switches Installation 500
52-61-151 Page 402 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/67
500 Forward Airstair Extend Limit Switches Installation
Nov 15/67 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-151 Page 403
FORWARD AIRSTAIR EXTEND LIMIT SWITCHES - ADJUSTMENT/TEST
EFFECTIVITY
Standard Passenger Airplanes
1. Forward Airstair Extend Limit Switches Adjustment
A. General
(1) The normal system extend limit switch (S3) and standby extend limit switch (S4) are not identical switches, but they are adjusted to their proper operating limits in a similar manner. Therefore, the following procedure is applicable to both switches with exceptions noted.
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.
B. Equipment and Materials
(1)
Rig Pin -0.2480 +0.0005/-0.0010-inch diameter by 2.50 inches long
(2)
Volt-Ohmmeter - Simpson, Model 260
C. Adjust Forward Airstair External 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 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)
Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position.
NOTE: Removal of carriage step control actuator from left end of forward and aft rails may be accomplished to facilitate smooth and even manual movement of carriage during adjustment of airstair extend limit switches.
5C8
Feb 20/92 52-61-151 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(5)
Manually move carriage to extended position and insert rig pin through index hole in aft rail and into index slot in carriage beam.
NOTE: Step (6) is applicable to adjustment of normal system extend limit switch (S3) only. Step (7) is applicable to adjustment of standby system extend limit switch (S4) only.
(6)
Connect volt-ohmmeter across terminal Y1 on relay K1 and pin 5 of airstair electrical connector for normal system extend limit switch (S3).
(7)
Connect volt-ohmmeter across terminal Y1 on relay K2 and pin 17 of airstair electrical connector for standby system extend limit switch (S4).
(8)
Adjust locknuts on limit switch until volt-ohmmeter indicates zero ohms.
(9)
Remove rig pin and manually move carriage inboard then slowly outboard; index holes should be aligned when switch actuates. Check by inserting rig pin.
(10)
After adjustment, check that switch actuates when switch roller is positioned on switch actuating ramp within limits shown on Detail D.
(11)
Remove rig pin and manually move carriage inboard and outboard several times to assure that switch maintains adjustment.
(12)
Install safety wire on switch and remove volt-ohmmeter.
(13)
Install carriage step control actuator (view 1) on left end of forward and aft rail, if removed earlier, and check that carriage step elevates when carriage is moved to extended position.
(14)
Manually move carriage to retracted position, insert rig pin through index slot in aft rail and into index hole in carriage beam (Detail A).
(15)
Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position and install safety wire on lever (Detail B).
(16)
Remove rig pin and connect airstair electrical connector.
500
52-61-151 Page 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/92
500 Forward Airstair Retract Limit Switches Adjustment
Feb 20/92 Figure 501 (Sheet 1) 52-61-151
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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