©2019 JBT LEKTRO, INC. All rights reserved.
October 2019
4-31
CHAPTER 4: COMPONENTS & CONTROLS
4.10
OPTIONAL AIRCRAFT PROTECTION
SYSTEM
The optional Aircraft Protection System limits tractor Winch power, Cradle height, Motor power,
and braking force to prevent torque damage to the aircraft nose gear. This system measures
the amount of torque during a tow and alerts the operator if safe levels have been exceeded.
The Aircraft Protection System consists of the following components:
•
Load Pins:
Each Lift Cylinder includes a Load Pin that measures aircraft node gear weight.
•
Turntable Cradle:
The Cradle includes a Turntable with Torque Cell to measure the amount
of torque being applied to the aircraft nose landing gear.
•
Cradle Height Limiter:
Restricts the maximum Cradle height, to prevent false alarms and
reduce torque on the aircraft nose landing gear.
•
Pressure Reducing Valve:
Controls hydraulic pressure to the Winch motor, to limit Winch
force.
•
Programmable Logic Controller:
Interprets the Load Pin and load cell readings, specified
recognition level, and other parameters to limit tractor acceleration, deceleration, and Winch
force as needed to prevent damage to the aircraft nose landing gear. The PLC includes a
Key Switch that is used to reset the system if a torque warning is triggered. See
"RESETTING THE AIRCRAFT PROTECTION SYSTEM” on page
.
If equipped, the Aircraft Protection System may be configured as either:
•
Single-level:
A single-level Aircraft Protection System is calibrated for a single aircraft type.
"SINGLE-LEVEL AIRCRAFT PROTECTION SYSTEM” on page
.
•
Multiple-level:
A multi-level Aircraft Protection System is calibrated for multiple aircraft
types. The tractor operator presses the appropriate button for the type of aircraft being
towed, and the tractor adjusts to the specified level. See
Note
If the tractor is not equipped with an Aircraft Protection System, then the right side of
the left Instrument Panel will not have any lights or controls.
AUTHORED BY ANTHONY HERNANDEZ - (415)786-2081 - [email protected]
