Forward Airstair Installation 563
52-61-100 Page 402 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/77
G. Tie disconnected electrical connectors and swing arm out of way to prevent damage by movement of airstair (Fig. 402).
H. Loosen locknuts on normal extend limit switch (S3). Raise switch away from ramp so that only one thread is visible below bottom locknut (Fig. 403).
I. Remove carriage step control actuator from door end of each rail (View l, Fig. 401).
J. Remove carriage extend stop from door end of each rail (view 1).
CAUTION: DO NOT LIFT AIRSTAIR BY HANDRAILS. HANDLING THE AIRSTAIR REQUIRES PROPER TOOLING TO PREVENT DAMAGE TO UNIT AND TO ASSURE PROPER ALIGNMENT BETWEEN AIRSTAIR AND AIRPLANE.
K. Position hoist and sling and attach sling to lifting lugs of airstair.
L. Disengage carriage drive pinions by moving carriage pinion disconnect lever to unlocked position and move airstair outboard until disengaged.
M. Place airstair in suitable container and remove sling.
4. Install Forward Airstair
CAUTION: IF A REPLACEMENT AIRSTAIR IS BEING INSTALLED, BOTH EXTEND LIMIT SWITCHES (S3 AND D4) AND RETRACT LIMIT SWITCHES (S5 AND S6) SHOULD BE LOOSENED TO PREVENT POSSIBLE DAMAGE TO SWITCHES.
A. Open airstair door fully and open forward airstair circuit breakers on P6-4 panel.
563 Forward Airstair Installation
Jan 20/83 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-100 Page 403
B. Tie swing arm and electrical connectors out of way to prevent damage from movement of airstair.
C. Assure that upper ladder is fully retracted by inserting No. 1 rig pin through index hole in carriage aft beam and into index hole in ladder truck; remove rig pin. Make same check at carriage forward beam; remove rig pin (Fig. 401).
D. Check that 1ower ladder is fully folded and locked.
E. Check that carriage step is fully down.
F. Place carriage pinion disconnect lever in unlocked position.
CAUTION: DO NOT LIFT AIRSTAIR BY HANDRAILS. HANDLING THE AIRSTAIR REQUIRES PROPER TOOLING TO PREVENT DAMAGE TO UNIT AND TO ASSURE PROPER ALIGNMENT BETWEEN AIRSTAIR AND AIRPLANE.
G. Insert airstair on rails as follows:
(1)
Position hoist and sling over airstair and attach sling to lifting lugs.
(2)
Position airstairs on support device.
(3)
Position airstair at opening in fuselage.
CAUTION: AIRSTAIR MUST BE FIRMLY SUPPORTED DURING INSTALLATION OR STRUCTURE AND AIRSTAIR WILL BE DAMAGED.
(4)
Orient airstair to airplane, and index carriage pinions to racks on rails.
CAUTION: CARRIAGE PINIONS MUST ENGAGE FIRST TOOTH OF RACKS IN FORWARD AND AFT RAILS SIMULTANEOUSLY.
(5)
Move airstair inboard until fully engaged with rails. If rail extension tool is used, move airstair carefully inboard until sling contacts crossbar on rail extension tool.
CAUTION: SPECIAL CARE SHOULD BE TAKEN WHEN WORKING ON AIRSTAIRS TO NOT TRIP THE LOWER LADDER OUT-OF-SEQUENCE POSITION. EXTENSIVE DAMAGE WILL OCCUR IF STAIRS ARE OPERATED WITH LATCH IN INCORRECT POSITION.
(6)
If installed remove sling.
H. Move carriage inboard until retract stops are contacted. Engage carriage drive pinions by moving carriage pinion disconnect lever to locked position.
563
52-61-100 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Sep 20/82
I. Remove support device and install screws in airplane body bolthole locations used for attaching the two vertical supports.
J. Install carriage extend stop on door end of each rail (View 1, Fig. 401).
(1) Install shim under forward and aft stop to achieve a gap of 0.005 to 0.040 between roller and carriage beam with one roller contacting carriage beam. Shim forward and aft stops equally.
K. Disengage carriage drive pinions and move airstair outboard until airstair actuator is accessible over electronic compartment access door.
L. Install the swing arm (Fig. 402):
(1)
Attach the swing arm to the bracket on the airstair actuator.
(2)
Make sure both ends of the swing arm point up.
CAUTION: DO NOT INSTALL THE SWING ARM SO THAT THE ENDS POINT DOWN. IF THE ENDS POINT DOWN THE SWING ARM AND THE WIRE CAN BREAK. THIS CAN CAUSE SPARKS, FIRE AND DAMAGE TO EQUIPMENT. 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(147)
