FORWARD AIRSTAIR SPEED-UP LIMIT SWITCH -ADJUSTMENT/TEST
EFFECTIVITY
Standard Passenger Airplanes
1. Forward Airstair Speed-up Limit Switch Adjustment
A. Equipment and Materials
(1) Voltohmmeter, Simpson Model 260
B. Adjust Forward Airstair Speed-up Limit Switch
(1) 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.
(2) Gain access to airstair area through electronic compartment 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.
(3)
Partially retract airstair and disconnect airstair electrical connector P1 on aft rail.
(4)
Check that switch actuator roller is touching flat portion of ramp (Fig. 501).
(5)
Adjust switch plunger so it is just touching switch actuator.
(6)
Disconnect switch wiring and connect ohmmeter across switch and check for open.
(7)
Adjust jamnuts so switch plunger is depressed 0.16 士0.02 inch by ramp. Check that switch is closed.
(8)
Connect airstair electrical connector P1 on aft rail, close airstair circuit breakers, and extend and partially retract airstair using STANDBY power and check that switch maintains adjustment.
(9)
Disconnect voltohmmeter and install lockwire on switch.
(10)
Connect switch wiring and install drain pan if removed.
5C8
Feb 20/92 52-61-211 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Speed-up Switch Adjustment 500
52-61-211 Figure 501 May 15/73
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD AIRSTAIR ANGLE GEARBOX - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. Equipment and Materials
A. No. 1 rigging pin - 0.4980 +0.0005/-0.001-inch diameter by 4.00 inches long
B. No. 2 rigging pin - 0.2480 +0.0005/-0.001-inch diameter by 2.50 inches long
NOTE: Rigging pins are part of F70207-61.
C. Grease - MIL-G-23827 (Ref 20-30-21)
2. Prepare for Removal
A. Remove Drain Pan (if installed)
(1) Extend airstair to provide clearance for removing drip pan attachment fasteners (Fig 402).
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.
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.
(4)
Obtain access to drip pan attachment fasteners through access hatch. Remove fasteners.
CAUTION: DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OR USE SWING ARM AS HANDHOLD OR SWING ARM 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.
5C8
Feb 20/92 52-61-221 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Angle Gear Installation 500
52-61-221 Figure 401 (Sheet 1) Oct 20/85
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Forward Airstair Angle Gearbox Installation
Sep 20/81 Figure 401 (Sheet 2) 52-61-221
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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