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APU | |
 By eliminating reliance on ground-based power units (to start main engines), the aircraft-mounted APU revolutionized the commercial airline industry; enabling aircraft to fly to remote locations around the world.
Click here for the APU Shipping Checklist. |
APUs Provide:  | | Starting power for main engines | | | Pneumatic power for environmental control systems | | | Drive power for other pneumatic and hydraulic systems | | | Backup electrical and pneumatic power for in-flight | | | operations | | | Electric and pneumatic power for ground operations |
| With 20 basic models and 41 variants, Honeywell APUs are found on the majority of aircraft worldwide. Since 1952 we've delivered more than 64,800 APUs, used in more than 150 applications. |
131-9 Series
The original 131-9D was designed specifically for the Boeing MD-90 airplane. The 131-9A was introduced in January, 1998 for Airbus’ A320 series aircraft. The 131-9A is already ‘taking off’ to equip hundreds of aircraft from the dozens of airlines & aircraft leasing companies around the world. The 131-9 series brought many technical improvements to Honeywell’s APUs. These included a two-stage axial turbine for increased engine life and a single starter/generator that uses electrical power to start the APU, but then becomes a generator once the APU is running. |
331-200 Series
The 331-200 series represented a breakthrough in engine development and manufacturing. Through the use of the same internal design as an existing turboprop engine, engine development time and manufacturing cost were greatly reduced. The in-flight operation of the 331-200 series APU allows two-engine commercial aircraft to fly extended ranges because the APU provides back-up electrical power during flight in the unlikely event of a main engine failure. The 331-200 is also the first electronically controlled APU. |
331-500 Series
The first application of the 331-500 was the Boeing 777 aircraft, where it’s highly reliable in-flight operability allows extended twin engine operations (ETOPS) of that aircraft.The engine is Honeywell’s first to use an eductor to cool oil. It also has both an electrical starter and an air turbine starter for in-flight starting. Earlier APUs used oil coolers that required the installation of oil cooling fans. An oil eductor uses the vacuum created by exhaust air flow to draw air across it, thus cooling the oil. The oil eductor design has since been implemented on other Honeywell APUs including the 131-9B and RE200 series. |
85 Series
The 85 series APU revolutionized commercial air travel as the first APU to be installed in an aircraft. Previously, commercial air crews used a ground based source to provide electrical power and compressed air for engine starting. The 85’s first installation was a Boeing 727, in 1963. An aerospace industry landmark, the 30,000th production unit was delivered in 1996 (of course many product improvements have been made over the years). The 85 series APU was inducted into the Smithsonian Institution for being the world’s most widely used aircraft APU. The 85 is currently being used to test advanced materials that increase engine life. |
RE220
The RE220 demonstrates Honeywell’s advances in aircraft system integration by being the first general aviation APU to communicate with the aircraft’s maintenance data acquisition unit (MDAU). The link to the MDAU allows pilots and aircraft mechanics to monitor APU performance and troubleshoot faults from the aircraft flight deck. |
660 Series
The 660 is the largest Honeywell APU installed on a commercial aircraft. The 660 was specifically designed to start the massive engines used on the Boeing 747 airplane. In addition, this workhorse drives two electrical generators that provide power to the aircraft. |
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