Creation: 01.31 - 2014
1-1-1
GPU - 406
INFORMATION
1. Unit Description
A. GPU-406 and GPU-409
The GPU-406 and GPU-409 are self-contained, diesel engine-driven, ground power units. The units
are designed to supply regulated 400 Hz electrical power to a parked aircraft for operation of the
aircraft's electrical equipment when the on-board generators are not running. The components of the
GPU-400 series are of a simple but rugged design with sufficient safety devices to ensure a long,
trouble-free service life. The illuminated control panel and backlit LCD display provide for easy night
operation.
The ground power units feature a brushless-revolving-field generator, rubber-torsion-axle-mounted
chassis of rugged galvanized steel construction with fifth-wheel steering, powder-coated sheet metal
panels, and fiberglass housings. TLD GPU’s can be equipped to meet Tier 3 (Stage IIIA) or Tier 4
Final (Stage IV) emissions standards.
Options available on the GPU-400 ground power units are listed below. Each piece of optional
equipment is covered by its own instructions and parts breakdown, and is located in Chapter 4.
Disregard the option if it is not applicable to your unit.
(1) Low fuel warning with shutdown or idle
(2) Low fuel warning
(3) Engine block heater (120 VAC or 240 VAC)
(4) Amber or red, flashing, non-flashing, or rotating warning beacon
(5) 28.5 VDC transformer-rectifier (TR) package with current limiting, rated at 600 amps continuous
and 2500 amps peak output
(6) 2nd 400 Hz output
(7) Fuel filter / water separator with heater
(8) Plastic rub rails
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