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Aircraft Generators: Everything You Need to Know

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PartsBase is a very useful tool I take advantage of every day. When it comes to sourcing parts I operate on urgent AOG requirements. PartsBase provides me with so many useful tools and diverse vendors to make sure I can satisfy all my requirements.

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Jimmy White
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I understand firsthand why companies use PartsBase.The PartsBase team is exceptional and the system is top notch. I truly appreciated all the support over the years.

At Duncan Aviation Parts & Rotable Sales, we receive thousands of calls from customers wanting to buy parts because they found us in PartsBase.

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Aviation Generator & Aircraft Parts For Sale

In the world of aviation, aircraft generators play a crucial role in powering various electrical systems and ensuring the smooth operation of an aircraft. Understanding how aircraft generators work is essential for aviation professionals, as it enables them to make informed decisions when selecting the most suitable power source for their aircraft.

So in this article we are going to look at the different types of generators, their key features, the pros and cons of these generators, and the use cases for them. But first things first, let’s take a look at what aircraft generators are and how they work. 

What are Aircraft Generators?

Aircraft generators are responsible for converting mechanical energy into electrical energy and serve as the primary power source for a wide range of aircraft systems, including:

  • Lighting systems

  • Communication devices

  • Navigation instruments

  • And more. 

Without a reliable generator, an aircraft would be unable to function properly, potentially compromising the safety and efficiency of flight operations. But let’s take a look at the roles of generators to further understand the topic. 

How Aircraft Generators Work 

Aircraft generators are driven by the aircraft's engine, where mechanical power is converted into electrical power through a set of rotating parts and electromagnetic fields and then distributed and utilized by the electrical systems throughout the aircraft.

They also play a crucial role in emergency situations, where they can provide backup power to essential systems, allowing the pilots to maintain control of the aircraft. So now that we understand what generators are and how they work, let’s look at the key features they offer. 

The 5 Features of Aircraft Generators

When selecting an aircraft generator, several key features should be considered to ensure optimal performance and reliability. Let’s delve deeper into the the main features that make generators possible: 

Feature

How it Works

Power output

It determines the electrical energy the generator can provide to the aircraft's systems, which are required for power-intensive systems, such as commercial aircraft. 

Durability

The generator must be able to withstand the harsh environmental conditions encountered during flight, like extreme temperature variations, intense vibrations, and electromagnetic interference. 

High-quality materials

They can withstand the stress and strain of flight are essential and should be made of sturdy materials that can protect the internal components from external factors such as moisture, dust, and other contaminants.

Reliability 

It should be equipped with reliable components that are designed to last, including the brushes, bearings, and other critical parts that are subject to wear and tear. 

Built-in safety features

These features include features like overload protection and automatic shutdown mechanisms, to prevent damage and ensure the safety of the aircraft and its occupants.


When selecting an aircraft generator, it is important to consider factors such as power output, efficiency, durability, and reliability. But before choosing a generator that meets these criteria, let’s look at the different types of generators available in the market.

The 2 Main Types of Aircraft Generators

There are two main types of aircraft generators, each with its own unique characteristics and applications. So let’s take a look at the different types to further understand this topic. 

Type of Generator

How They Work 

Alternating Current Generators 

They produce alternating current, which can be easily transformed into different voltage levels using transformers and are well-suited for powering larger systems that require high power loads.

Direct Current Generators

They produce direct current, which is used to power smaller systems and electronics like the battery, communication devices, and small lighting systems. It is in charge of storing energy that is used for night flights, ensuring that the communication devices remain operational and the cabin lights continue to work. 


These types of aircraft generators are then broken down into two main categories and then broken down further which help identify the type of generator for the aircraft. So let’s get into further detail on how these categories work. 

The 2 Main Categories for Aircraft Generators

When it comes to aircraft generators, understanding the categories they are divided into, is essential in determining the ideal generator for a specific aircraft. So let’s look at these categories. 

The Primary Aircraft Generator Category

The primary generator category includes three main types of generators, including: 

  • Belt-driven generators, which are driven by engine accessories, making them simple to use. 

  • Shaft-driven generators, which utilize the mechanical energy produced by the engine to generate electrical power.

  • Engine-mounted generators, which provide electrical power and drive engine accessories. 

There is however another category including more types of generators. So let’s take a closer look into which types of generators are included in the specialized aircraft generator category. 

The Specialized Aircraft Generator Category

There is also a specialized generator category that caters to specific aircraft and operational needs. The types of generators that this category includes:

  • Emergency generators, which provide electrical power during critical situations and can be activated manually or automatically.

  • Auxiliary power units (APUs), which are self-contained power units that serve as an additional power source for various aircraft systems.

  • Wind-driven generators, which utilize the airflow created during flight to generate electrical power and harness the kinetic energy of the wind to produce electricity. 

By understanding these categories, aircraft owners and operators can make informed decisions when selecting the right generator for their specific aircraft. But to fully understand this topic, let’s compare the types of generators to determine which works best for your needs. 

Comparing The Types of Aircraft Generators

Understanding the pros and cons of each aircraft generator and their use is crucial in determining which type is most suitable for specific aircraft applications. So let’s take a closer look at the differences between each type: 

Type 

Pros

Cons

Uses

Belt-driven generators

It’s simple and easily installed and  maintained

They may not offer the same power as shaft-driven generators. 

Smaller aircraft, such as personal planes and general aviation aircraft.

Shaft-driven generators

They excel in terms of power output and efficiency.

They can be complex to install and maintain.

Larger aircraft, such as commercial airliners and military aircraft.

Engine-mounted generators

They offer convenience and are easily installed. 

They may have limited power output. 

From small business jets to large commercial airliners. 

Emergency generators

They play a crucial role in providing backup power.

They are designed for short-duration usage.

They are used in all types of aircraft to ensure safety. 

APUs 

They offer versatile power capabilities to power onboard systems.

They require additional space and are harder to install.

Commercial aircraft and larger business jets.

Wind-driven generators

They offer renewable energy and are environmentally friendly. 

They may have limited power output. 

They are used in gliders or aircraft with extended loiter times. 


Understanding the different aircraft generator categories and their respective pros and cons is essential in selecting the most suitable option for specific aircraft applications. But now that we have covered what aircraft generators are and their types, let’s look at where generators are heading. 

The 7 Future Advancements of Aircraft Generators

The advancements in generators not only aimed at enhancing power output, efficiency, and overall performance but also at addressing the ever-increasing demand for sustainable and environmentally friendly power solutions in the aviation industry. So let’s take a look at some examples: 

  1. The development of lightweight and durable alloys, which allow for the construction of more efficient generators, reducing weight and improving fuel efficiency. 

  2. The integration of smart electronics and digital control systems which enable real-time monitoring of generator performance, reducing the risk of unexpected failures. 

  3. The development of advanced cooling systems which help dissipate heat generated during the power generation process, expanding the generator’s lifetime.

  4. The use of advanced power electronics and semiconductor devices, which help reduce harmonic distortions and improve voltage regulation.

  5. The use of hybrid power systems in aircraft, which improve overall efficiency and reduce reliance on fossil fuels leading to reduced emissions.

  6. The integration of regenerative power systems, which harness and store energy generated during braking or descent, allows the aircraft to become more energy-efficient. 

  7. The development of more compact and lightweight generators which can be easily integrated into smaller aircraft and unmanned aerial vehicles (UAVs). 

The future of aircraft generators holds great promise. With continuous advancements in technology and an increasing focus on sustainability, the aviation industry can look forward to more efficient, reliable, and environmentally friendly power solutions for their aircraft.

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Last Thoughts on Aircraft Generators 

As the aviation industry evolves, staying informed about the different categories and types of aircraft generators will be paramount for aviation professionals. By understanding the unique characteristics and applications of each generator category, professionals can make informed decisions to ensure the optimal performance and safety of their aircraft.