Posted on May 2nd, 2018
An Auxiliary Power Unit (APU) is a compact, self-contained device installed on many aircraft, particularly large jets and long-range aircraft, that provides power for onboard systems when the main engines are not running. The APU is a crucial component of modern aviation, offering electrical and pneumatic power necessary for aircraft functions before takeoff, during boarding, or while parked at a remote stand.
Unlike the main engines, the APU does not provide propulsion. Instead, its role is to support various non-flight operations, such as:
In private aviation, APUs are especially valuable because they allow passengers to enjoy a fully climate-controlled cabin, powered lighting, and operational Wi-Fi while still on the tarmac—all without relying on airport ground services or running the main engines. This creates a more comfortable and seamless experience for JetOptions clients as they board or prepare for departure from a private FBO terminal.
Aircraft APUs typically generate 115-volt AC at 400 Hz, which differs from standard household power (50/60 Hz), and some also supply 28V DC depending on the aircraft’s system requirements. These systems are sophisticated, often built by specialized aerospace manufacturers such as Honeywell and Pratt & Whitney, and are designed to operate autonomously and reliably, even in extreme weather conditions.
Some of the heavy jets and ultra-long-range jets in the JetOptions fleet are equipped with high-performance auxiliary power units (APUs), enabling operations at remote airports, during extended ground times, or on missions that require greater self-sufficiency.
While APUs are also used in military aircraft, naval vessels, and large ground vehicles, their most visible role in business aviation is ensuring a smooth, efficient, and independent operation, especially valuable when operating out of smaller, less-equipped airfields.
What Is an Auxiliary Power Unit (APU)? | JetOptions Private Jets
Explore the role of an Auxiliary Power Unit (APU) in private jets. Learn how APUs power cabin systems, increase comfort, and support independent operations during charter flights with JetOptions.
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