Ground Power Unit, or GPU for short, is the name given to power supply equipment that provides clean power for both maintenance and engine starting aircraft that are on the ground. A GPU, much unlike your average household power supply, is unique in that it provides a very specific “ripple free” or “clean” voltage, this ensures sensitive avionics and control systems within the Aircraft are protected during powered maintenance and engine starting operations.
START PAC® engineers have developed an extensive range of Aircraft Ground Power Units designed to meet all manner of end use scenarios, from providing reliable mobile ground power for remote airstrips through to powerful hybrid solutions for fully high throughput Aircraft Maintenance, Repair & Overhaul operations. All START PAC® Ground Power Units are made in-house and combine quality components, unparalleled after sales support and a 1 year warranty as standard.
Ground Power Units (GPU)
Perhaps your aircraft is voltage sensitive and equipped with an over voltage protection relay?
Training, maintenance or software downloads require you to start your engine safely and power up numerous systems without running the engine; at the same time, however, you want to be comfortable in your cockpit and enjoy its air conditioning. And why not?
Training, maintenance or software downloads require you to start your engine safely and power up numerous systems without running the engine; at the same time, however, you want to be comfortable in your cockpit and enjoy its air conditioning. And why not?
Maybe you don’t always have easy access to AC power because the fleet you operate is large and aircraft are not always parked close to the hangar?
Frequently Asked Questions
What Is a Ground Power Unit (GPU)?
A ground power unit (GPU) is a device that supplies electrical power to an aircraft while it is on the ground. It is essential for operating systems such as lighting, avionics, and air conditioning without using the aircraft’s onboard power sources. Ground power units for aircraft can be fixed, mobile ground power units, or portable ground power units, catering to various operational needs. If you’re looking for a ground power unit for sale, options vary based on aircraft requirements.
How Does a Ground Power Unit Work (GPU)?
A ground power unit works by converting external energy, such as electrical or fuel-generated power, into a form compatible with aircraft systems. The aircraft ground power unit connects to the aircraft using standardized cables and plugs, delivering regulated power to essential systems like navigation and climate control. Some advanced green GPU models also feature environmentally friendly technology to reduce emissions.
Why Is a GPU Important for Aircraft?
Ground power units are important for reducing an aircraft’s onboard Auxiliary Power Unit (APU) workload. By providing external power, GPUs conserve fuel, reduce engine wear, and support pre-flight activities like system checks and cabin preparation. Whether it’s a fixed system or a mobile ground power unit, these devices streamline operations and lower operational costs.
What Types of GPUs Are Available?
- Diesel-powered GPUs
- Electric GPUs
- Hybrid GPUs (a combination of fuel-driven engines and battery/electric power)
Several types of GPUs cater to different needs:
- Portable ground power units: Compact and easy to handle, perfect for smaller aircraft or temporary setups.
- Mobile ground power units: Mounted on carts or vehicles for easy transportation across airport grounds.
- Fixed GPUs: Installed permanently at airports for regular use.
- Green GPUs: Designed for eco-friendly operations, often powered by renewable energy sources.
What Are the Typical Power Ratings of a GPU?
GPUs typically range in power ratings depending on the application:
- Adjustable voltage settings for 12V, 24V, or 28V aircraft systems.
- Single-phase GPUs for general aviation, typically rated at 110-220V.
- Three-phase GPUs for commercial aviation, suitable for larger pneumatic engines.
- Electric GPUs with built-in power supplies rated to match specific aircraft needs.
These ratings ensure that the aircraft ground power unit provides the necessary energy for various operational systems.
How Does a GPU Connect to an Aircraft?
Modern aircraft have external ports or receptacles that connect to the GPU using a three-pin or aircraft-specific connector. Older aircraft may require direct connections to the battery terminals for engine starting. Once connected, the GPU provides power to the aircraft’s systems.
This connection ensures safe and reliable power transfer. For instance, a ground power unit for aircraft designed for commercial jets will have connectors and voltage settings tailored to meet their specific needs.
What Is the Difference Between a GPU and an APU?
A GPU (Ground Power Unit) is an external device providing electrical or engine-starting power, while an APU (Auxiliary Power Unit) is a smaller turbine engine inside the aircraft. The APU powers onboard systems and assists in starting larger jet or turbine engines, especially in military and commercial aviation.
GPUs are more fuel-efficient than APUs, making them a preferred choice for ground-based operations. Additionally, options like green GPUs and mobile ground power units offer flexibility and environmental benefits.
Are GPUs Environmentally Friendly?
Yes, modern GPUs are increasingly environmentally friendly, particularly those meeting Tier 4 EPA emission standards or electric GPUs, which produce no emissions. Green GPUs are powered by renewable energy sources or designed with low-emission technology, significantly reducing their carbon footprint. Electric GPUs are safe for use indoors, such as in hangars, as they eliminate harmful odors and emissions associated with diesel-powered GPUs.
What Maintenance Is Required for GPUs?
Maintaining a GPU involves regular checks and servicing. This includes inspecting cables and connectors, calibrating power output, cleaning cooling systems, and replacing worn-out parts. Regular maintenance ensures longevity and consistent performance, whether it’s a portable ground power unit or a larger fixed system.
Can GPUs Be Used for All Types of Aircraft?
Most GPUs are versatile and compatible with a wide range of aircraft, from smaller private planes to large commercial jets; there’s a GPU to match the power requirements. Portable ground power units are ideal for smaller aircraft, while larger, more powerful units cater to commercial and military planes.
However, compatibility depends on the aircraft’s power requirements and the GPU’s specifications.
What Safety Measures Should Be Taken When Using a GPU?
Safety is critical when using a GPU. Always check that the output matches the aircraft’s power requirements, inspect cables for damage, and ensure the unit is properly grounded. Secure the placement of mobile ground power units to prevent movement during operation.
Safety measures include:
- Properly securing connectors to prevent accidental disconnection.
- Avoiding the use of diesel-powered GPUs indoors without adequate ventilation.
- Following manufacturer guidelines for operating and maintaining the GPU.
- Ensuring staff are trained in GPU operations.
How Do GPUs Contribute to Cost Savings
Ground Power Units reduce costs by extending the life of aircraft batteries and engines through cleaner, cooler starts. They also provide power for maintenance and training without relying on the aircraft’s onboard systems, reducing wear and tear.
Are GPUs Portable?
Yes, portability is a key feature of many GPUs. Portable ground power units are lightweight and compact, making them easy to move and set up for temporary or remote operations. Portable GPUs often have wheels or compact designs for ease of movement.
How Is GPU Output Monitored?
GPU output is monitored through built-in displays or meters that track voltage, current, and power delivery. Advanced GPUs may include digital interfaces for precise monitoring and adjustments. Advanced aircraft ground power units may also feature remote monitoring capabilities, allowing operators to track performance from a distance.
What Industries Commonly Use GPUs?
While GPUs are primarily used in the aviation industry for powering aircraft, they are also employed in military operations and any industry requiring external power for vehicles, and equipment. The versatility of ground power units for aircraft extends to supporting ground-based equipment and aerospace research.
Are There Standards For GPU Design And Operation?
Yes, GPUs are manufactured to meet stringent industry standards, such as ISO 6858 and SAE AS7974, which ensure safety, compatibility, and efficiency. When looking for a ground power unit for sale, it’s essential to verify that the unit complies with these standards.
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