(3)
Connect the electrical connector to the receptacle on the carriage.
F. Install pin connecting fork end (11) on actuator to clutch release link (12) on carriage pinion disconnect mechanism.
G. Connect "dog" coupling (16) on ball screw drive shaft and remove No. 1 rig pin.
H. Connect electrical connectors of both actuator motors (14).
5. Restore Airplane to Normal
A. Remove No. 2 rig pin and disengage carriage drive pinions by moving carriage pinion
disconnect lever (2) to unlocked position.
B. Manually move carriage to retracted position and insert No. 2 rig pin through retract index slot
(4) and into retract index hole in aft beam of carriage.
C. Engage carriage drive pinions by moving carriage pinion disconnect lever (2) to locked position. Install lockwire on lever.
D. Remove No. 2 rig pin and connect electrical connector (3) to receptacle.
E. If required, install drain pan through airstair door opening inside of fuselage (Fig. 402).
F. Close forward airstair system circuit breakers on circuit breaker panel P6.
G. Extend airstair and install drain pan attachment fasteners if installed. Install drain pan access hatch and connect drain hose.
500
Oct 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-111 Page 405
Forward Airstair Drain Pan Access 500
52-61-111Page 406 Figure 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/72
FORWARD AIRSTAIR BALLSCREW - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. Extension of airstair to full down position will unload ballnut trunnions after airstair contacts ground since ballscrew will override until down limit switch provides cutoff.
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.
B. Removal and replacement of the ballscrew can be accomplished without removing airstair assembly from airplane.
2. Equipment and Materials
A. No. 1 rig pin -0.4980 +0.0005/-0.0010-inch diameter by 4.0 inches long
B. No. 2 rig pin - 0.2480 +0.0005/-0.0010-inch diameter by 2.50 inches long
C. Grease - MIL-G-23827 (Ref 20-30-21)
3. Prepare for Removal
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 (3) (Fig. 401).
D. Disengage carriage drive pinions by moving carriage pinion disconnect lever (2) to unlocked position.
5C8
Feb 20/92 52-61-116 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Ballscrew Installation 500
52-61-116Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/83
E. Manually move carriage outboard to fully extended position and move carriage pinion disconnect lever to locked position.
F. Secure carriage to rail by inserting No. 2 rig pin through extend index hole (1) in aft rail and into index slot in aft beam of carriage.
G. Secure ladders to carriage by inserting No. 1 rig pin through index hole (5) in aft beam of carriage and into index hole in ladder truck.
4. Remove Ballscrew and Bearing Block Assembly (Fig. 402)
A. Remove cotter pin and pin from ballscrew splined coupling.
B. Remove bolts and washers securing trunnion pickup fittings from truck assembly.
C. Wrap tape around ballscrew shaft both sides of ballnut/trunnion to prevent overrunning off end of shaft.
D. Remove nuts and bolts securing inboard bearing block assembly.
E. Remove nuts and bolts securing outboard bearing block assembly, taking care to support ballscrew shaft in the horizontal plane.
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