E. Install drain pan if removed.
F. Close forward airstair system circuit breakers on circuit breaker panel P6.
G. Extend airstair and install drain pan attachment fittings if installed.
H. Visually inspect entire airstair for scrapes, bends, dents, loose connections, cleanliness and completeness of assemblies.
I. Perform at least three complete cycles (extension and retraction) of airstair checking for smooth operation noting in particular any binding or interference of parts having relative motion to each other.
CAUTION: IF DURING EXTENSION AND RETRACTION OF THE AIRSTAIR, EXCESSIVE BINDING, DRAGGING OR INTERFERENCE IS NOTED, STOP THE CYCLE, INVESTIGATE CAUSE AND TAKE CORRECTIVE MEASURES OR DAMAGE TO THE AIRSTAIR MAY RESULT.
500
52-61-116 Page 408 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/77
FORWARD AIRSTAIR MOTOR - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. The normal system motor (115 volts ac) and standby system motor (28 volts dc) are removed and installed in the same manner therefore the following instructions are applicable to both motors.
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. No. 1 rigging pin - 0.4980 +0.0005/-0.001-inch diameter by 4.00 inches long
B. No. 2 rigging pin - 0.2480 +0.0005/-0.001-inch diameter by 2.50 inches long
NOTE: Rigging pins are part of F70207-61.
3. Prepare for Removal
A. Remove Drain Pan (if installed)
(1)
Extend airstair to provide clearance for removing drip pan attachment fasteners (Fig. 402).
NOTE: Temporary access can be attained by partially retracting airstair.
(2)
Gain access to drip pan through electronic compartment access door.
(3)
Remove hose clamp and drain hose from access hatch in drip pan. Remove access hatch.
(4)
Obtain access to drip pan attachment fasteners through access hatch. Remove fasteners.
CAUTION: DO NOT ATTEMPT TO MOVE SWING ARM OUT OF WAY OR USE SWING ARM AS HANDHOLD OR SWING ARM MAY BE DAMAGED.
(5)
Retract airstair and release control before airstair door begins to close. Remove drip pan through airstair - airstair door opening on side of fuselage.
5C8
Feb 20/92 52-61-121 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Motor Installation 500
52-61-121 Page 402 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/68
500 Forward Airstair Motor Installation
Aug 15/72 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-121 Page 403
B. Open airstair circuit breakers on panel P6. Disconnect airstair electrical connector (3) (Fig. 401).
C. Disengage carriage drive pinions by moving carriage pinion disconnect lever (2) to unlocked position.
D. Manually move carriage outboard until airstair actuator (1) is positioned above electronic compartment access door.
E. Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position.
4. Remove Forward Airstair Motor
A. Disconnect electrical connector of motor (8 or 9) being removed.
B. Remove four socket head cap screws (7) and two locknuts attaching motor to actuator and remove motor.
5. Install Forward Airstair Motor
A. Position motor (8 or 9) on aft side of actuator and secure the motor with four socket head cap screws (7) and two locknuts.
B. Install safety wire on the two cap screws that are not secured with locknuts.
C. Connect electrical connector of motor to receptacle.
6. Restore Airplane to Normal
A. Disengage carriage drive pinions by moving carriage pinion disconnect lever (2) to unlocked position.
B. Manually move carriage inboard to fully retracted position and insert No. 2 rig pin through retract index slot (4) and into retract index hole in aft carriage beam.
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