(3)  
Engage carriage drive pinions by moving carriage pinion disconnect lever to the locked position.

NOTE:  After manual retraction and prior to power operation of airstair it must be resequenced as described in paragraph 5.
After the airstair has been manually retracted, the airstair door may be closed electrically. This can be accomplished by closing the normal forward airstair door circuit breaker on circuit breaker panel P6; connecting the airstair electrical connector (1) and operating the controls for the normal retract mode.
5.  Resequence Forward Airstair
A.  Check that forward airstair system circuit breakers on circuit breaker panel P6 are in open position.
B.  Check that airstair electrical connector (1, Fig. 201) has been disconnected and tagged with an operational limitation tag.
C.  With the airstair fully retracted and airstair door fully open, place the carriage pinion disconnect lever (5, Fig. 201) in the unlocked position and manually pull the airstair outboard until the airstair actuator (9, detail B) is positioned over the electronic compartment access door.
D.  Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position.
E.  Index the upper ladder to the carriage.
(1)  
Disconnect the "dog" coupling (10) on actuator drive shaft (11) and manually move ladders horizontally until index hole (15, detail C) in aft beam of carriage is aligned with hole in ladder truck (14) and insert No. 1 rig pin.

(2)  
Connect the "dog" coupling on actuator drive shaft and remove No. 1 rig pin.

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52-61-100 Page 206  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/68 

F.  Index the carriage to the airstair aft rail.
(1)  
Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position.

(2)  
Manually move carriage inboard until retract index hole (7) in aft beam of carriage is aligned with retract index slot (2) in retract limit switch bracket on aft rail and insert No. 2 rig pin.

(3)  
Engage carriage drive pinions by moving carriage pinion disconnect lever to the locked position. Install safety wire on the lever and remove No. 2 rig pin.

G.  Remove operational limitation tag from electrical connector (1) and connect electrical connector to receptacle in airplane.
H.  Close forward airstair system circuit breakers on circuit breaker panel P6.
I.  Install drain pan hatch if removed.
500 
Aug 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-61-100 Page 207 

FORWARD AIRSTAIR - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A.  The forward airstair is a self-contained unit which is removed from, and installed in the airplane in the retracted condition. Prior to removal or installation of the airstair, the forward airstair door must be fully open and power should be removed from the electrical connection to the airstair.
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.  Equipment and Materials
A.  Forward airstair Transportation Sling - OHME65-45888
B.  Use commercial lifting equipment
C.  Hoist or overhead lifting mechanism which may be connected to the transportation sling
D.  No. 1 rig pin, - 0.4980 +0.0005/-0.0010-inch diameter by 4.0 inches long
E.  No. 2 rig pin, - 0.2480 +0.0005/-0.0010-inch diameter by 2.50 inches long
3.  Remove Forward Airstair
A.  Extend airstair and gain access to area above drain pan through access hatch and remove drain pan attachment fittings 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.
B.  Retract airstair and release control before airstair door begins to close. Remove drain pan if installed.
C.  Open airstair circuit breakers on panel P6. Disconnect airstair electrical connector (Fig. 402).
D.  Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position (Fig. 401).
E.  Move airstair outboard until airstair actuator is accessible over electronic compartment access door and return carriage pinion disconnect lever to locked position.
　
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