(2)
Manually open airstair door by rotating actuator manual drive.
(3)
Loosen locknuts on door closed limit switch, move switch outboard as far as threads permit, and retighten locknuts (Fig. 501).
(4)
Apply a lump of molding clay, or similar substance, to outboard face of switch actuating plate.
(5)
Manually close airstair door by rotating actuator manual drive and observe following as door approaches closed position:
(a)
Observe relationship between cross-pin on door latch fitting and top of door latch pin protruding through door sill. Stop turning manual drive when cross-pin appears to have moved outboard of latch pin, or when an outside observer signals that exterior of door is flush with surrounding fuselage skin.
(b)
Deleted
(c)
Check that any accessible stop pin is in contact with bearing plate on structure.
5C8
Feb 20/92 52-61-601 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(6)
Manually open airstair door. From impression made in molding clay, measure amount of clearance between end of switch plunger and actuating plate.
(7)
Adjust position of switch to move it inboard by the amount of clearance measured in step
(6) plus an additional 0.07 to 0.11 inch. Tighten switch locknuts to secure switch in position.
(8)
Clean molding clay from switch actuating plate.
(9)
Install standby motor (Ref 52-61-591, Removal/Installation).
(10)
Close the following circuit breakers on circuit breaker panel P6-4:
(a)
FORWARD AIRSTAIR CONTROL
(b)
FORWARD AIRSTAIR DOOR
(c)
FORWARD AIRSTAIR ACTUATOR
(d)
FORWARD AIRSTAIR STANDBY CONTROL
(e)
FORWARD AIRSTAIR STANDBY
(11)
Operate forward airstair door electrically and check that switch actuates properly to stop actuator and extinguish STAIRS IN OPERATION warning light (at internal control station) when airstair door is closed.
(12)
With door closed and latch pin fully extended check that there is no interference between inboard face of cross pin and outboard face of latch pin.
(13)
Open airstair door and apply lump of molding clay to all eight bearing plates around door opening.
(14)
Close airstair door electrically. When actuator has stopped, open door again and check that all door stop pins have contacted bearing plates.
(15)
If steps (12) and/or (14) indicate that airstair door is not traveling far enough when closing, adjust position of limit switch slightly outboard as necessary, and repeat steps (11) thru (14).
(16)
When adjustment is satisfactory, install safety wire on locknuts securing switch to bracket and clean molding clay from bearing plates.
501
52-61-601 Page 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 20/74
501 Forward Airstair Door Closed Limit Switches Adjustment
May 15/78 Figure 501 52-61-601
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD AIRSTAIR DOOR OPEN LIMIT SWITCHES - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. The following removal and installation procedure is applicable to each of the two airstair door open limit switches (normal system and standby system); however, these two switches are not identical and are not interchangeable. The normal system switch is actuated by a clockwise rotation of the switch shaft by the switch arm and the standby system switch is actuated by a counterclockwise rotation of the switch shaft by the switch arm. The normal system switch is mounted with switch arm aft and the standby system switch is mounted with switch arm forward (Fig. 401).
2. Remove Forward Airstair Door Open Limit Switches
A. Open the following circuit breakers on circuit breaker panel P6:
(1)
FORWARD AIRSTAIR CONTROL
(2)
FORWARD AIRSTAIR DOOR
(3)
FORWARD AIRSTAIR ACTUATOR
(4)
FORWARD AIRSTAIR STANDBY CONTROL
(5)
FORWARD AIRSTAIR STANDBY
B. Gain access to work area through electronic compartment access door.
C. Disconnect limit switch electrical wiring at splices.
D. Loosen lockscrew on switch operating arm, remove locknut from end of switch shaft, and remove operating arm from switch (Fig. 401).
E. Remove nut securing limit switch to bracket and remove switch.
3. Install Forward Airstair Door Open Limit Switches
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