Leonardo Helicopters: Power Requirements & Ground Support Guide

Helicopters demand reliable electrical power long before the rotors ever turn. During maintenance cycles, avionics checks, and pre-flight preparation, ground crews depend on external power sources to keep aircraft systems active without drawing down onboard batteries. For operators running Leonardo Helicopters, understanding those power requirements is not an afterthought. It is part of keeping the aircraft mission-ready.

Leonardo S.p.A. produces helicopters for some of the most demanding environments in aviation: offshore platforms, emergency medical services, military operations, and law enforcement. The platforms are sophisticated, and so are their electrical systems. Getting ground support means using the right equipment, in the right configuration, every time.

This guide covers:

• Typical power configurations used by Leonardo Helicopters
• How ground power units support these aircraft during ground operations
• Best practices for safe and effective ground power operations

Overview of Leonardo Helicopters

Leonardo S.p.A. is one of the most widely deployed helicopter manufacturers in the world, with platforms in service across civil, government, and defense roles in more than 150 countries. Understanding the scope of that portfolio helps ground support teams appreciate the range of configurations and power requirements they may encounter.

A Global Helicopter Manufacturer

Leonardo is a major aerospace and defense manufacturer headquartered in Rome, Italy. Through its helicopter division, formerly known as AgustaWestland, the company has become one of the world’s leading producers of rotary-wing aircraft. Its platforms serve civil, military, and government operators across more than 150 countries.

The company name carries historical resonance. Long before modern rotorcraft existed, Leonardo da Vinci helicopter sketches from the late 15th century depicted an aerial screw, a concept widely cited as an early precursor to rotary-wing flight. Today’s Leonardo S.p.A. carries that legacy into the modern era with a portfolio spanning lightweight single-engine platforms through large twin-turbine aircraft.

Popular Leonardo Helicopter Models

Leonardo’s current lineup includes several widely operated models:

• AW109 – A light twin-turbine platform used for VIP transport, law enforcement, and EMS
• AW119 – A single-engine turbine helicopter used in utility and EMS roles
• AW139 – A medium twin frequently deployed in offshore transport and search-and-rescue
• AW169 – A newer medium-twin designed for EMS, law enforcement, and public service
• AW189 – A heavy twin used primarily in offshore oil and gas operations

These helicopters operate across virtually every demanding context, such as hospital helipads, offshore platforms, border patrol, military utility missions, and VIP transport. That operational diversity means ground support requirements vary, but the need for stable, clean DC ground power is consistent across the lineup.

Why Helicopters Require Ground Power

External power is not a workaround. For professional helicopter operations, it is standard procedure.

Maintenance and Diagnostics

External ground power handles the electrical load during helicopter maintenance, allowing aircraft systems to remain active without running the engine. Avionics testing, fault code interrogation, software updates, and system functional checks all rely on this capability. Using an external ground power unit (GPU) for these tasks keeps diagnostic systems active while eliminating unnecessary engine hours.

Battery Preservation

A ground power unit preserves onboard battery capacity by taking over the electrical load during ground operations. Onboard aircraft batteries are expensive and sensitive to deep discharge cycles. Running avionics, communication systems, and cockpit displays from an aircraft battery during extended maintenance degrades capacity and shortens service life, which matters especially in operations with tight turnaround schedules.

Safety During Ground Operations

External power also supports safer ground operations. A stable, regulated power source reduces the risk of voltage spikes or fluctuations that could affect sensitive avionics. During servicing, a GPU provides consistent power delivery, something that cannot be guaranteed when drawing from a battery in an unknown state of charge.

Typical Electrical Systems in Modern Helicopters

Understanding the basic electrical architecture of modern helicopters helps maintenance teams and ground crews select the right GPU configuration and apply power correctly.

DC Electrical Architecture

The primary electrical architecture on most light-to-medium helicopter platforms, including many in the Leonardo family, is DC-based. 28V DC is the standard for most turbine-powered helicopters, a specification that traces back to military standardization and remains prevalent across the industry today.

Avionics and Flight System Power

Modern helicopters power a wide range of systems through their electrical buses: flight management systems, navigation equipment, communication radios, autopilot systems, and digital avionics displays. During ground operations, these systems often need to remain active for extended periods, a situation where an external power source is far preferable to battery draw.

The Role of Aircraft Batteries

Aircraft batteries serve two primary functions: engine starting and emergency backup power. They are not designed for extended ground use. Repeatedly discharging a helicopter battery to support maintenance checks accelerates wear and increases the likelihood of a no-start scenario when it matters most. Protecting that battery reserve is a straightforward operational priority.

Ground Power Units for Leonardo Helicopters

Selecting the right ground power unit starts with understanding what the equipment is designed to do and how it fits the specific aircraft and operating environment.

What Is an Aircraft Ground Power Unit?

An aircraft GPU is an external electrical power source used to supply power to an aircraft while it is on the ground. GPUs eliminate the need to run the aircraft’s engine or draw from onboard batteries during maintenance, pre-flight checks, or extended ground operations. 

They come in several configurations: portable units, wheeled mobile units, and larger autonomous systems, depending on the operational environment and power requirements.

Common Voltage Types Used in Helicopter Ground Power

For most helicopter platforms, including the majority operating today, 28V DC ground power is the relevant standard. Some lighter platforms operate on 24V systems, and configuration details vary by aircraft. The practical point is that the GPU must output regulated, clean DC power at the correct voltage for the specific aircraft. A unit that delivers unstable or incorrect voltage is not just ineffective; it creates risk for sensitive avionics systems.

Always confirm the aircraft’s power requirements against the aircraft maintenance manual before selecting or connecting a GPU.

Portable vs. Mobile Ground Power Units

The operating environment usually determines which GPU format is appropriate.

Portable GPUs are battery-powered, self-contained units that can be brought directly to the aircraft. They are well-suited to light helicopter platforms, remote sites, and operations where access to AC power is not guaranteed. Additionally, they are practical for EMS and offshore helicopter operations where aircraft are parked at locations far from fixed electrical infrastructure.

Mobile GPUs are larger, cart-mounted units that typically combine a battery bank with an integrated power supply. When connected to an AC source, the power supply runs aircraft systems continuously with no duty cycle. In battery-only mode, they support engine starting and short-duration ground operations. This combination makes mobile GPUs the more capable option for MRO facilities and high-throughput flight operations.

Best Practices for Supplying Ground Power to Helicopters

How ground power is applied matters as much as which unit is used. These practices apply across helicopter types and operating environments.

Use Aviation-Grade Ground Power Equipment

Not all power sources are appropriate for helicopter ground support. Consumer-grade battery packs, automotive jump starters, and unregulated power supplies can introduce noise, voltage irregularities, or current spikes that damage avionics and flight systems. Aviation-certified GPU equipment is engineered to deliver clean, regulated DC power within the tolerances aircraft systems require.

Follow Aircraft Manufacturer Guidelines

The aircraft maintenance manual is the definitive reference for ground power procedures on any specific platform. This includes correct voltage settings, connector type, connection sequence, and maximum current draw. Deviating from approved procedures, even with high-quality equipment, can create electrical issues that are difficult to trace and expensive to resolve.

Proper Connection and Monitoring

Standard practice before connecting any GPU: confirm the output voltage matches the aircraft’s requirements, verify connector integrity, and ensure the unit is operating within its rated parameters before applying power to the aircraft. Monitor output during use, particularly during engine starts when current demand spikes sharply.

Choosing the Right Ground Power Solution

Not every GPU is the right fit for every helicopter operation. The correct selection depends on the aircraft’s power requirements, the operating environment, and the operator’s fleet composition.

Reliability in Aviation Ground Support

GPU reliability is a non-negotiable requirement in professional helicopter operations. A unit that fails to start an aircraft on a hospital helipad or an offshore platform does not just create delay. It grounds the aircraft. Equipment built for demanding field conditions and consistent duty cycles is the baseline standard that operators should apply to any GPU selection.

Portability for Helicopter Operations

Helicopters routinely operate from locations that have no fixed electrical infrastructure: remote landing zones, offshore platforms, forward operating bases, and emergency response sites. Portable, battery-powered GPUs that can support starts and short-duration maintenance without an AC connection are operationally necessary for these environments, not optional accessories.

Scalability for Mixed Aircraft Fleets

Many operators who run helicopters also maintain mixed fleets, including turboprops, business jets, or additional rotary-wing types. Ground power equipment that covers the full voltage range across those platforms (24V, 26V, 28V DC) reduces the number of units required and simplifies fleet-wide logistics. Selecting equipment that scales across aircraft types is worth evaluating as part of any GPU procurement decision.

Ground Power in Real-World Helicopter Operations

The demands on ground power equipment vary significantly depending on the mission type. These examples illustrate how GPU requirements differ across common helicopter operations roles.

Emergency Medical Service (EMS) Operations

EMS helicopters operate on uncompromising timelines. Between missions, helicopter maintenance checks and avionics updates happen rapidly on hospital helipads and remote landing zones, frequently without access to hangar infrastructure. 

A portable GPU allows ground crews to complete those checks quickly and without drawing on the aircraft battery, keeping the aircraft ready for the next dispatch.

Offshore Oil & Gas Transport

The AW139 and AW189 are both heavily deployed in offshore transport roles, operating from platform decks and remote shore bases where reliable fixed power is rarely available.

Autonomous GPU systems, including battery-powered and diesel-electric hybrid units, are well-suited to these conditions, providing starting capability and maintenance power independent of shore-side infrastructure.

Military and Government Helicopters

Military helicopter maintenance frequently occurs in forward-deployed environments where infrastructure is limited and operational tempo is high. Ground power equipment for these applications needs to perform reliably across a wide temperature range, handle repeated starts without extended recovery time, and operate without creating emissions in enclosed spaces.

Supporting Leonardo Helicopters with Reliable Ground Power

Dependable ground power equipment protects the aircraft’s electrical systems, extends battery service life, and keeps the aircraft available when it needs to be. For operators working with Leonardo Helicopters across EMS, offshore, military, and government roles, the right GPU selection is a direct input into operational availability.

The original Leonardo da Vinci helicopter concept imagined a machine that could rise above the constraints of the ground. The modern platforms that carry that name still depend on reliable, well-matched ground support to stay mission-ready between flights.

START PAC manufactures a full lineup of aviation ground power units purpose-built for helicopter operations. They include: 

• Portable SUPER PAC™ micro GPU units in 24V, 26V
• 28V configurations
• Mobile combination GPU sets with integrated power supplies from 50A to 400A continuous
• Lithium-battery GPU sets for reduced weight and extended cycle life
• Ranger™ diesel-electric autonomous GPU for off-grid operations
• START PAC® GREEN™, the world’s first 100% battery-powered autonomous GPU

All products are made in the USA, carry a 1-year warranty on workmanship and materials, and are backed by over 60 years of combined aviation ground support experience. Custom configurations are available for operators with specific voltage, amperage, or connector requirements.

Conclusion

Leonardo Helicopters operates in some of the most demanding roles in aviation. Keeping those aircraft ready requires maintenance teams and ground crews to have reliable, properly matched ground power at every stage of operations. Understanding the aircraft’s electrical requirements, selecting aviation-certified equipment, and following approved procedures protects the aircraft’s systems and supports continuous operational availability.

For more information on selecting the right ground power unit for your operation, or to understand how external power supports helicopter maintenance procedures, START PAC provides both the equipment and the field expertise to help operators make confident, well-informed decisions.

Whether your operation focuses on offshore transport, EMS, or mixed fleet management, the right ground support equipment is part of what makes helicopter operations reliable at every level.