(3)
Connect the electrical connector to the receptacle on the carriage.
M. Adjust Airstair.
(1)
If same airstair is being reinstalled, adjust normal extend limit switch (S3) (Ref. 52-61-211 A/T).
(2)
If new airstair is being installed refer to 52-61-0 A/T.
N. Move airstair to retracted position and install carriage step control actuator on door end of each rail (View 1, Fig. 401).
O. Check for satisfactory operation of carriage step by moving airstair outboard to full carriage travel.
P. Check adjustment of forward and aft inflight support brackets as shown on Fig. 402.
Q. Move carriage assembly to retracted position and insert No. 2 rig pin through retract index slot in aft rail (Fig. 402) and into index hole in carriage beam.
R. Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position.
S. Remove No. 2 rig pin.
T. Connect airstair electrical connector to receptacle Fig. 402).
U. Test airstair operation (Ref. 52-61-0 A/T).
563
Oct 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-100 Page 405
Airstair Electrical Connector Locations and Inflight Support Bracket Adjustment 500
52-61-100 Figure 402 Feb 20/87
Page 406
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
563 Normal Extend Limit Switch (S3) Location
Feb 15/80 Figure 403 52-61-100
Page 407
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD AIRSTAIR - INSPECTION/CHECK
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. The following procedure provides a means of checking airstair ball screw ball nut end play without removing the ball screw assembly from the airstair in the airplane.
B. The ball nut end play limits specified in this procedure are applicable to ball screw assemblies manufactured by Walter Kidde Company. For end play limits on ball screw assemblies manufactured by Edwards Enterprises, refer to Weber Aircraft Overhaul Manual for the forward airstair assembly.
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. Dial indicator - capable of taking readings from 0.000 to 0.020 inch
B. Dial indicator clamping tool - a clamping tool configuration that can be used to mount a dial indicator on the ball screw with the assembly on the airstair in the airplane.
3. Check Forward Airstair Ball Screw Ball Nut End Play
A. Extend airstair to full down position.
NOTE: Full extension of airstair unloads ball nut trunnions after stair contacts ground, since the ball screw Will overdrive until down limit switch provides cutoff.
B. Open airstair circuit breakers on panel P6. Disconnect airstair electrical connector (Fig. 602).
C. Mount dial indicator on ball screw using clamping fixture. Adjust dial indicator probe so that probe is in contact with ball nut (Fig. 601).
D. With all play of ball nut taken out by handloading in one direction, adjust dial indicator to zero.
E. Hand load ball nut in opposite direction until dial indicator movement stops and record end play. Repeat three times.
NOTE: Prevent relative rotation between ball nut and screw during measurement process.
5C8
Feb 20/92 52-61-100 Page 601
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Ballscrew Ballnut End Play Check 500
52-61-100 Figure 601 Nov 15/72
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Airstair Electrical Connector Location
Nov 15/72 Figure 602 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-100 Page 603
F. If endplay exceeds 0.015 inch on a ball screw having original size balls, replace the ball screw assembly.
G. If endplay exceeds 0.010 inch on a ball screw assembly having oversize balls, replace the ball screw assembly for overhaul.
H. Connect electrical connector to receptacle.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737 AMM 飞机维护手册 舱门 DOORS(148)
