(2)
FORWARD AIRSTAIR DOOR
(3)
FORWARD AIRSTAIR ACTUATOR
(4)
FORWARD AIRSTAIR STANDBY CONTROL
(5)
FORWARD AIRSTAIR STANDBY
C. Remove two jackscrew nut bushings and disengage jackscrew nut from carriage (Fig. 401).
D. Move airstair door to closed position and temporarily secure.
E. Remove locknut and washer from inboard end of jackscrew and withdraw jackscrew from actuator.
F. Remove bolt connecting carriage to lower guide fitting on door and remove carriage from guide rails by disengaging rollers at lower end of carriage guide rails.
NOTE: Airstair door actuator may be pivoted up and inboard on mounting bracket to facilitate removal of carriage from carriage guide rails.
2. Install Forward Airstair Door Carriage
A. Remove standby motor (Ref 52-61-591, Removal/Installation).
B. Position jackscrew (with jackscrew nut threaded on ) between the carriage guide rails. Do not insert jackscrew into actuator at this time.
C. Position door carriage on lower end of carriage guide rails.
NOTE: Airstair door actuator may be pivoted up and inboard on mounting bracket to facilitate positioning of carriage on guide rails.
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D. Check that end clearance between each guide pin and adjacent guide rail is 0.02 inch. (Sec. A-A, Fig. 401) Adjust guide pins as necessary.
E. Move carriage up and down carriage rails and check that carriage operates freely.
F. Temporarily secure carriage in position on rails away from actuator and insert jackscrew into actuator. Check that snubber is installed on carriage at this time. Snubber assembly is positioned over splines on end of jackscrew shaft with rubber face away from ball nut. (Fig. 401) Install washer and self-locking nut securing jackscrew to actuator.
G. Release carriage from its temporarily secured position and connect jackscrew nut to carriage using two jackscrew nut bushings. (Detail A)
H. Manually operate carriage along rails by rotating actuator manual drive and check that jackscrew drives carriage freely.
I. With airstair door secured in fully closed position continue manual operation of carriage to position the two outboard rollers on carriage in alignment with 0.25 inch diameter holes in guide rails. (View 1) When the rollers are in this position the carriage should engage lower guide fitting on door.
(1) If necessary, adjust lower guide fitting so that carriage aligns properly without binding against either of the carriage guide rails.
NOTE: The lower guide fitting is adjustable vertically and horizontally by using the serrations on its base. Laminated shims between the base and door may be added or removed to adjust in the inboard/outboard direction. (Detail B)
J. Install bolt connecting door to carriage and remove temporarily installed restraints holding door in fully closed position.
K. Check adjustment of door closed limit switches and door open limit switches. Refer to 52-61-601, Forward Airstair Door Closed Limit Switches - Adjustment/Test and 52-61-611, Forward Airstair Door Open Limit Switches - Adjustment/Test.
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525 Forward Airstair Door Carriage Installation
Aug 15/72 Figure 401 (Sheet 1) 52-61-511
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Forward Airstair Door carriage Installation 500
52-61-511 Figure 401 (Sheet 2) Nov 15/68
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FORWARD AIRSTAIR DOOR ACTUATOR - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. Remove Forward Airstair Door Actuator
A. Open the forward airstair door 2 inches or more from closed position and temporarily secure in this position.
B. 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
C. Gain access to work area through electronic compartment access door.
D. Disconnect electrical connectors from normal actuator motor and standby actuator motor (Fig. 401).
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