M28B Bryza airplanes are powered by two TWD-10B/PZL-10S engines and Hartzell 5-blade propellers.
Basic parameters of the PT6A-65B engine:
- engine type –turboprop with a free turbine
- maximum take-off power 1100SHP (820kW)
- maximum cruising power 1000SHP (745 kW)
- operating conditions – ambient temperature -50°C ÷ 50°C
Basic parameters of the propeller:
- propeller type – variable pitch, feathering and thrust reversible
- diameter – 2.8 m.
Fuel tanks, together with two fuel supply pumps in each tank and fuel gauge transmitters are located inside both outboard wings and the centerwing.
The total capacity of the fuel system is 1960 liters (516 US gal) or 2278 liters (601 US gal) depending on the version. The outboard wing and centerwing tanks can be refueled either through fillers or pressure-filled (single point or central refueling). The pressure refueling system is provided with a double protection system against overfilling, with an option for manual control.
The Bendix/King equipment allows the operation according to VFR and IFR requirements day and night all-weather.
The operation of the M28 Bryza family airplanes in the Polish Armed Forces began in July 1984, when the first AN-28 aircraft was flown at WSK PZL Mielec. Over time, after heavy modernization, the M28B Bryza airplanes were developed, currently M28B 1R (reconnaissance version) equipped with the ARS-400 maritime patrol radar and the PIT-made ŁS-10 Łeba tactical communications system. These airplanes are still used by Naval Air Force for patrolling the Polish sea border.