A-A-59959
3.2 Mounter and Demounter, Pneumatic Tire, Computer Controlled Torqueing System
description. The Mounter and Demounter, Pneumatic Tire, Computer Controlled Torqueing
System shall provide a simple, safe and reliable means of assembling/disassembling aircraft main
and nose wheels. It shall be designed for efficient operation, with or without the aid of an
overhead hoist, to eliminate heavy lifting by the operator. It shall be designed to provide a stable
horizontal position for wheel bolt torqueing operations. All mechanical operations of the Mounter
and Demounter, Pneumatic Tire, Computer Controlled Torqueing System shall incorporate
emergency stops, for safe operation. The Mounter and Demounter, Pneumatic Tire, Computer
Controlled Torqueing System shall be equipped with a computer controlled twin spindle nut
runner. The nut runner shall be capable of accommodating both odd and even number wheel bolt
patterns. The torqueing system shall have easy to follow instructions to provide the appropriate
torque data for the specific aircraft wheel to be entered. Spindle space settings shall be near
automatic, and not labor intense and time consuming. The Mounter and Demounter, Pneumatic
Tire, Computer Controlled Torqueing System shall be equipped with an operator interface system
which uses a touch screen monitor and an integral Windows operating system. The monitor shall
be mounted to the nut runner positioning fixture and shall be located directly in front of the
operator at a convenient working height when using the torqueing system. The operator interface
system shall identify the specific nut runner spindle spacing for a particular wheel, as well as
other necessary information for assembly and disassembly. The actual final torque values for each
tightening sequence shall be displayed on the operator interface monitor, indicating the pass and
fail criteria. The interface system shall be capable of storing individual wheel torque data for
future reference and report generation. The interface system shall provide menu-driven software
procedures to add or delete wheel data and torque values. Data system must be capable of
password protection.
3.3 Design and construction. The Mounter and Demounter, Pneumatic Tire, Computer
Controlled Torqueing System shall be an electro-hydraulic type. The Mounter and Demounter,
Pneumatic Tire, Computer Controlled Torqueing System shall be designed to be used at depots
and tire shops by personnel of average mechanical skill. The Mounter and Demounter,
Pneumatic Tire, Computer Controlled Torqueing System shall comply with the following
requirements in Table I:
Table I. Design & construction requirements.
Design
Construction
Maximum Overall dimensions
220"W x 140"D x 180"H
(Excluding trolley)
Torque value
80ft-lbs. minimum
370ft-lbs. maximum
Position accessibility around wheel
360 degree
Accommodates aircraft wheels
7" minimum
26" maximum
Bolt tightening accuracy
1% full-scale
Wheel configuration storage capacity 100 minimum
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