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E.  Remove bolts attaching each door open limit switch mounting bracket to the door actuator. Leave switches attached to mounting bracket and allow to hang free.
F.  Remove self-locking nut and washer securing inboard end of jackscrew to door actuator.
G.  Remove two bolts and bushings securing actuator to actuator support.
H.  Lift actuator slightly and move actuator inboard to withdraw jackscrew and remove actuator.
NOTE:  Normal and standby actuator motors are mounted on the actuator and will be removed with actuator.
2.  Install Forward Airstair Door Actuator
A.  With airstair door temporarily secured in a partially open position, hold actuator (with normal and standby motors attached) in position and insert jackscrew into actuator. Check that snubber is installed on end of jackscrew at this time. Snubber is inserted over splines on end of shaft with rubber face toward actuator (Fig. 401).
5C8
Feb 20/84 52-61-521 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

B.  Position actuator on actuator support and install two bushings, attaching bolts, and washers. With door in open position and actuator and screw centered, install AN960C516 and/or AN960C516L washers to maintain a maximum fore and aft actuator movement of 0.05 inch. (Fig. 401)
C.  Compress snubber approximately 0.27 inch until jackscrew is bottomed in actuator. Install washer and self-locking nut on inboard end of jackscrew securing it to door actuator.
D.  Release airstair door from its temporarily secured position.
E.  Position each door open limit switch and attached mounting bracket on door actuator and install attaching bolts.
NOTE:  The electrical bonding jumper provided on some airplanes should be reconnected to the standby switch bracket at the lower bolt.
F.  Connect electrical connectors to normal actuator motor and standby actuator motor.
G.  Check adjustment of door open limit switches. Refer to 52-61-611, Forward Airstair Door Open Limit Switches - Adjustment/Test.
H.  Close circuit breakers opened in paragraph 1.B. and cycle airstair door electrically (normal system and standby system) to check operation.
525 
52-61-521 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/72 

525  forward Airstairs Door Actuator Installation 
Aug 15/72  Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-521 Page 403 

FORWARD AIRSTAIR DOOR LOCK MECHANISM - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A.  The forward airstair door lock mechanism consists of an exterior and interior control assembly and a lock pin assembly. Each assembly (or part of) may be removed and installed independent of the others and are covered under separate procedures. However, the operation of the assemblies is interdependent and the door lock mechanism must be complete to allow adjustment of the installation.
2.  Removal/Installation Exterior Control Assembly
A.  General
(1)   The exterior control assembly consists of an exterior control handle, two telescoping units, a control cable and casing (Fig. 401). The following procedure covers the complete assembly. For partial removal of the assembly omit steps for components not affected.
B.  Equipment and Materials
(1)   
BMS 519 Class B Pressure Sealant (Required for control handle installation)

(2)   
Grease - BMS 3-24 (Ref 20-30-21)

C.  Remove Exterior Control Assembly
(1)   
Open airstair door leaving airstair fully retracted.

(2)   
Open the following circuit breakers on circuit breaker panel P6.

(a)  
Forward Airstair Control

(b)  
Forward Airstair Door

(c) 
 Forward Airstair Actuator

(d)  
Forward Airstair Standby Control

(e)  
Forward Airstair Standby

 

(3)   
Remove extreme left access panel on the forward bulkhead of forward cargo compartment to gain access to control handle.

5C8
Feb 20/84 52-61-531 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Forward Airstair Door Lock Mechanism  500 
52-61-531 Page 402  Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/68 

500  Forward Airstair Door Lock Mechanism 
Sep 20/82  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-531 Page 403 
　
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