It is also known as a Hobart 140 kVA Cummins Engine Driven Ground Power Unit. 

Hobart generator sets covered by the manual include model 140 G17K (truck-mounted)). The function of this generator set is to produce and deliver regulated, 400-Hz, 115/200-V AC power to parked aircraft.

Manufacturer The manufacturer is Hobart. The generator sets are manufactured by the Power Systems Division, Hobart Brothers Company. 

Manufacturer Date : 2005.

Serial Number 205PS09162.

Working Hours The unit is designed with an electrically driven hourmeter (item 10) that operates from the 24-V battery system 8927 HOURS .

Condition : Refurbished 

The equipment described in the sources is a 140 kVA diesel engine-driven Ground Power Unit (GPU) manufactured by Hobart. This unit is designed to produce and deliver regulated 400 Hz electrical power for aircraft use when their on-board generators are inactive.

The sources detail specifications for two primary versions of the 140 kVA unit, differing mainly by engine: one featuring a Cummins QSB5.9 diesel engine, and another featuring a Detroit Diesel 8V-71N engine.

General Specifications and Performance

The generator sets are continuously rated for 140 kVA (kilovolt-ampere) and produce 400 Hz, 115/200 volt AC, 3-phase, 4-wire power.

The unit is designed to meet or exceed MIL-STD-704E Electrical Power Quality Requirements.

Electrical Performance Metrics

The unit features precise power delivery specifications:

• Voltage Regulation: ±1% from no load to full load.
• Voltage Adjustment: ±15 volts.
• Transient Voltage Recovery: To within ±1% in 100 milliseconds (when switching from no load to rated load).
• Frequency Regulation: ±1% steady state.
• Total Harmonic Distortion (THD): Less than 3% of the fundamental (RMS) voltage.
• Individual Harmonic Distortion (IHD): Less than 2%.
• Crest Factor: 1.404 ±0.07.

Engine Specifications

The specific technical details depend on the engine model used:

The unit features a Hobart-designed and manufactured generator intended for long life and reliability. The generator itself is a brushless, revolving field, three-phase, alternating-current type (technically an alternator).

Physical and Environmental Details

The construction and mobility features emphasize durability and functionality:

• Dimensions (Model 140CU24P5): Length is 139.5 inches (354 cm), Width is 77 inches (196 cm), and Height is 61 inches (155 cm).
• Weight (Model 140CU24P5): 6000 lbs (2722 kg).
• Maneuverability: The unit features a low profile and standard 5th wheel (turntable) steering with maintenance-free nylon bushings, aiding visibility and maneuverability in congested ramp areas.
• Braking: A choice of drum type braking systems is available: tow bar activated or hand brake activated.
• Environmental Range: It is rated for operation in temperatures ranging from -25˚ F to +125˚ F (-31˚ C to +52˚ C) and relative humidity of 0-100% noncondensing.
• Altitude: No altitude derating is required up to 10,000 feet when running in the normal operating range.

The equipment is housed in a sheet metal enclosure (canopy) that protects the engine, generator, and controls. This structure offers lift-off doors and pop-out panels for easy access to compartments.

A Ground Power Unit like this acts as the heavy-duty extension cord of the airfield, translating the mechanical power of a large diesel engine into the precise, high-frequency electrical current necessary to run the complex systems of parked aircraft, ensuring they are ready for flight operations without needing to run their own engines.