CESSNA 28V

The term "CESSNA 28V" does not refer to a specific aircraft model, but rather the 28-volt electrical system found in many modern and older Cessna aircraft, including models like the 1978 Cessna 182 Skylane and 1978 Cessna 172N. This 28V system is powered by the aircraft's generator or alternator, and can also be supported by an external ground power unit (GPU) or a backup battery for startup and operation.

Aircraft electrical system components

• Generator/Alternator:

The primary power source on an engine-driven aircraft, typically providing 28V DC power when the engine is running.

• Battery:

Provides power for starting the engine and serves as a backup if the generator fails.

• External Power Unit (GPU):

An external power source used for starting or operating the aircraft's electrical systems on the ground, especially when the aircraft battery is low.

• Standby Alternator:

Some aircraft, like the C208 Caravan, have a standby alternator that activates automatically if the main generator fails, providing 28V power.

Examples of Cessna models with 28V systems

• Cessna 182 Skylane: The 1978 model year introduced a 28V electrical system.
• Cessna 172N: This model uses a 28V electrical system.
• Cessna Stationair 6 (Cessna 206): The 1978 model year introduced a 28V electrical system.

Ground Power Unit (GPU) example specifications

• AERO Specialties TRU-28: A transformer rectifier unit that provides a 28V DC output with a constant current of 600A and starting peaks of up to 2400A.
• AERO Specialties GPU-28: A diesel-powered ground power unit that provides a 28.5V DC output.
• Aircraft Spruce Aviation Ground Power Unit: A lightweight GPU that provides 28 +/- 0.5 Volts DC, up to 35 amperes continuous, and accepts a 90-230 Volts AC input