Honeywell auxiliary power unit

Honeywell auxiliary power units are a series of gas turbine Auxiliary power units (APU) made by Honeywell Aerospace. Honeywell started manufacturing APUs in the early 1950s and since then they can be found on many aircraft.[1] Over the years Honeywell have produced more than 95,000 APUs and more than 36,000 are still in service.[2] In 2018 Honeywell had a 65% share of the airliner APU market and is the sole supplier for the Airbus A350, the Boeing 777 and single-aisle airliners: the Boeing 737 MAX, Airbus A220 (formerly Bombardier CSeries), Comac C919, Irkut MC-21 and Airbus A320neo after Airbus removed the Hamilton Sundstrand APS3200 option. Pratt & Whitney Canada (P&WC) claims the remaining 35% of the APU market with the Airbus A380, Boeing 787 and Boeing 747-8.[3]

A Honeywell GTCP36-150(CX) auxiliary power unit mounted in the tail of a Cessna Model 750 Citation X.

Variants

131 Series

The 131-9D initially was designed for the McDonnell Douglas MD-90 series; the 131-9B became standard equipment on Boeing 737NG; the 131-9A on the Airbus A320 family and Airbus A220 (formerly Bombardier C-Series).[4] The 131 Series uses a two-stage axial turbine and a single generator which starts the APU.[5]

331 Series

The 331 series are found on many wide-body Boeing and Airbus aircraft and the Honeywell 331-200 introduced several new technologies such as digital electronic control and the eductor for oil cooling, which eliminated the need for cooling fans.. The development of a turboprop derivative also reduced development time and production costs.[6][7] Its applications include Airbus A220 -100 and -300 series, A300, A330, A340, Boeing 767 and 777, Bombardier CRJ700/900/100, Comac C919 and Irkut MC-21.

See also

Footnotes

    References
    1. "Honeywell Auxiliary Power Units Make Aviation History With New Production Milestones". www.honeywell.com. Retrieved 2020-11-29.
    2. "Auxiliary Power Units". aerospace.honeywell.com. Retrieved 2020-11-29.
    3. Stephen Trimble (June 5, 2018). "How will Boeing-Safran venture shake up APUs?". Flightglobal.
    4. "Honeywell 131-9A APU Becomes Standard on the Airbus A320 family". Aviation Today. 2017-03-22. Retrieved 2020-11-29.
    5. "131 Series Auxiliary Power Units". aerospace.honeywell.com. Retrieved 2020-11-29.
    6. "Case Study: HONEYWELL Air Cooling Device – Ace Clearwater Enterprises". Retrieved 2020-11-29.
    7. "331 Series Auxiliary Power Units". aerospace.honeywell.com. Retrieved 2020-11-29.
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