Jetall GPU JTL28D3
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Jetall GPU JTL28D3

JetAll GPU Model JTL28D3 is a robust 28.5V DC engine-driven ground power unit designed for reliable aircraft starting and maintenance operations. Powered by a Perkins diesel engine, it delivers up to 800 amps continuous and 2000+ amps peak starting power, ensuring strong performance in demanding environments.

With precise voltage regulation, adjustable current control, and advanced protection systems, the JTL28D3 provides safe, efficient, and consistent power for ramp and hangar operations.

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Category:

Engine:
• Perkins Diesel 1104D series, operating at 1800 RPM
4-inline cylinders, 58 kW
• 12 VDC battery system
• Low oil pressure shutdown
• Intake air restriction indication
• Electronic governor system
• Automatic cold weather starts assist system

Alternator:
• Rating: 25 KVA, 0.8 PF, 22 Volt nominal; adjustable ±15 %
• 3 Phase, 4 wire Wye connected grounded neutral, revolving field, brushless, self-cooling, insulation class H
• Output: Rectified 28.5 Volt DC, 800 amp continuous. 2000 amp Peak Starting Current Capacity.

Regulation:
• Voltage Regulation: ±0.5% no load to full load

Protection:
• Overvoltage: instantaneous disconnect of load at 33.3 volts, with inverse time delay down to 31.6 volts in 10 seconds.
• Undervoltage: disconnects output below 22.1 volts in 7 seconds.
• Current Limiting Capacity: Adjustable from 300 amp to 2000 amp.
• Line Drop Compensation: Assures proper voltage at aircraft connection.
• Overload Safety Setting: 1,000 amp continues rated load for 30 seconds.

Finish:
• Galvannealed & Powder Coat paint provides excellent weather resistance, flexibility and adhesion, plus strong resistance to chemical agents, glycol and skydrol
• Standard colors are high gloss Ivory or White
• Custom colors require a paint chip or swatch for accurate color match.

Dimensions:
• Length (tow bar up): 256cm/101”
• Width : 160cm/63”
• Height : 145cm/57”
• Weight : 1311kg/2890lbs

Displays / Instrumentation:
Engine:
• Meters: coolant temperature, RPM, hour meter, oil pressure, Voltmeter, Fuel Quantity, Fault indications
• Indicator Lights: engine circuit on, air cleaner restriction, high coolant temperature, low oil pressure, engine stop delay action, and low fuel.
• Switches: Engine start, engine stop, panel lights
• Delayed shutdown for turbocharger protection

Alternator:
• Meters: ammeter, and voltmeter
• Indicator Lights: contactors on, current overload, over voltage, under voltage
• Switches: output contactor control, test / reset.

Optional Equipment:
• AC outlet 110/220 volt, 20 amps Kit.
• Tow and running lights.
• Cold weather Kit and Battery blanket (120Volt)
• Low fuel level, warning Kit
• Low Coolant level, warning Kit
• One (1) 9.2 meter, 28 volt output cable
• Amber flashing beacon mounted on roof.
• Weatherproof gauge mounting.

Specifications

Engine

  • Perkins, diesel 1104 series, 4 cylinders, 100BHP
  • Compliance with EPA, Tier 3 regulations
  • 12 VDC battery system
  • Low oil pressure shutdown
  • Intake air restriction indication
  • Electronic governor system
  • Automatic cold weather start assists system

Generator

  • Rating: 25 kW at 0.8 PF, adjustable ± 10-15 %
  • 3 Phase, 4 wire Wye connected grounded neutral, revolving field, brushless, self-cooling, single bearing rectifier assembly, insulation class H
  • Output: 28.5 volt DC, 800 amps continuous, 2,200 amps momentary

Overload

  • 1,200 amp rated load for 30 seconds

Regulation

  • Voltage regulation: ±0.5% no load to full load

Protection

  • Over-voltage: 32 volts disconnect in 5 seconds.
  • Under-voltage: disconnects below 22.1 volts in 7 seconds
  • Current limiting adjustable 300 amps and up
  • Line drop compensation assures proper voltage at aircraft connection

Finish

  • Powder Coat paint provides excellent weather resistance, flexibility and adhesion, plus a strong resistance to chemical agents such as glycol, Skydrol and Jet A
  • Standard color is High Gloss White
  • Custom colors require a paint chip or swatch for accurate color match

Dimensions

  • Weight: 1,280 kg (2,820 lbs.)
  • Width: 163 cm (63”)
  • Height: 153 cm (57”)
  • Length: 264 cm (103”) tow bar up

Display / Instrumentation

Engine

  • Meters: coolant temperature, RPM, hour meter, oil pressure, voltmeter, fuel quantity, fault indications
  • Indicator lights: engine circuit on, air cleaner restriction, high coolant temperature, low oil pressure, engine stop delay action, low fuel
  • Switches: engine start, engine stop, panel lights
  • Delayed shutdown for turbocharger protection

Generator

  • Meters: ammeter and voltmeter
  • Indicator lights: contactors on, current overload, over-voltage, under-voltage
  • Switches: output contactor control, test / reset

Optional Equipment

  • Transformer-Rectifier pack for 28.5VDC with current limiting, 800-amp continuous load and 2,200 peak; output cable, 10 meters
  • Transformer pack for 208 volt AC, 50/60Hz 3 phase, 120 amp continuous load, switch box, 10 meter output cable
  • AC outlet 110/220 volt, 20 amps kit
  • Tow and running lights
  • Cold weather kit (120 volt)
  • Low fuel level, warning kit
  • Low coolant level, warning kit
  • One (1) 9.2 meter, 28 volt output cable
  • Amber flashing beacon mounted on roof
  • Weatherproof gauge mounting

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