400HZ / 28VDC Combination Aircraft Ground Power Unit

One Unitron GPU can support multiple aircraft types if the aircraft share compatible electrical requirements, connector types, output ratings, and operating procedures. Mixed fleets often prefer multiple output types, which is why 400 Hz/28 VDC and 400 Hz/270 VDC combination GPUs can be useful.

A combination AC/DC GPU can reduce the number of separate power units needed in the hangar or on the ramp. Combining outputs into one unit can save floor space, simplify cable management, reduce equipment congestion, and support aircraft that require more than one type of external power.

A 400 Hz/28 VDC combination GPU provides both 400 Hz AC aircraft power and 28 VDC aircraft power from a single ground power unit. This is useful for operators that support mixed fleets, aircraft requiring both AC and DC support, or hangars and ramps where reducing equipment footprint is important.

To choose the correct aircraft GPU, confirm the aircraft’s required output type, output load requirement, connector, frequency, input and output cable lengths as applicable, input power, installation location, and environmental conditions. The most important starting point is whether the aircraft requires 400 Hz AC, 28 VDC, 270 VDC, or a combination output.

Choose a 400 Hz GPU when the aircraft requires 115/200 VAC, 400 Hz external power for avionics, lighting, cabin systems, maintenance, preflight checks, or other powered ground operations. 400 Hz GPUs are common for commercial aircraft, business jets, military aircraft, special-mission aircraft, and aircraft maintenance hangars.

Choose a 28 VDC GPU when the aircraft requires 28 VDC external power for avionics, maintenance, battery support, or engine start assistance. 28 VDC GPUs are commonly used with legacy helicopters, turboprops, business aircraft, regional aircraft, and many military aircraft applications.