501
52-61-0 Aug 15/68
Page 112
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD AIRSTAIR AND DOOR - ADJUSTMENT/TEST
EFFECTIVITY
Standard Passenger Airplanes
1. Forward Airstair and Door Adjustment
A. General
(1) Adjustments to the airstair and airstair door can be performed independently of the other. Refer to par. 1.B. for adjusting forward airstair and par. 1.C. for adjusting airstair door.
WARNING: IT IS DANGEROUS TO WORK BELOW THE AIRSTAIR CARRIAGE WHILE ELECTRICAL POWER IS ON THE AIRSTAIR. UNEXPECTED MOVEMENT OF THE AIRSTAIR OR DOOR COULD CAUSE SERIOUS INJURY.
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. Forward Airstair Adjustment
(1)
Equipment and Materials
(a)
No. 1 rigging pin - 0.4980 +0.0005/-0.0010 by 4.00 inches
(b)
No. 2 rigging pin - 0.2480 +0.0005/-0.001 by 2.50 inches
NOTE: Rigging pins are part of F70207-61.
(c)
Voltohmmeter - Simpson, Model 260
(2)
Adjust Forward Airstairs
(a) Remove drain pan (if installed).
1) Extend airstair to provide clearance for removing drip pan attachment fasteners (Fig. 501A).
NOTE: Temporary access can be attained by partially retracting airstair.
2) Gain access to drip pan through electronic compartment access door. 3) Remove hose clamp and drain hose from access hatch in drip pan. Remove access hatch.
Feb 20/92 52-61-0 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Retract Limit Switch Adjustment 500
52-61-0 Figure 501 May 15/68
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4) Obtain access to drip pan attachment fasteners through access hatch. Remove fasteners.
CAUTION: DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OF USE SWING ARM AS HANDHOLD OR IT MAY BE DAMAGED.
5) Retract airstair and release control before airstair door begins to close. Remove drip pan through airstair - airstair door opening on side of fuselage.
(b)
Open airstair circuit breakers on panel P6. Disconnect airstair electrical connector (2). (Fig. 501)
(c)
Insert No. 2 rig pin through retract index slot (5) in aft rail and into index hole in carriage beam.
(d)
Insert No. 1 rig pin into upper ladder index slot (8) to verify upper ladder is fully retracted.
(e)
If either the No. 1 or 2 rig pin cannot be inserted, resequence forward airstair, 52-61-
100.
(f)
Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position.
(g)
Connect voltohmmeter across terminal X1 on relay K1 (1) and pin 10 of airstair electrical connector (2) to check normal retract limit switch S5. Adjust locknuts on switch S5 until switch just opens.
(h)
Connect voltohmmeter across terminal X1 on relay K2 (3) and pin 15 of airstair electrical connector (2) to check standby retract limit switch S6. Adjust locknuts on switch S6 until switch just opens.
(i)
Remove rig pin and move carriage outboard then slowly inboard; index holes should be aligned when switches actuate. Check by inserting rig pin.
(j)
After adjustment, check that switches actuate when rollers are positioned on ramp within limits shown on detail A.
(k)
Remove rig pin and move carriage outboard and inboard several times to assure that switches maintain adjustment. Install safety wire on switches.
(l)
Remove voltohmmeter.
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 (S3 and S4).
(m)
Move carriage to extended position and insert rig pin through index hole in aft rail and into index slot in carriage beam. (Fig. 502)
(n)
Connect voltohmmeter across terminal Y1 on relay K1 (1, Fig. 501) and pin 5 of airstair electrical connector (2) to check normal extend limit switch S3 (Fig. 502). Adjust locknuts on switch S3 until switch just opens.
