Eurocopter AS-350 Écureuil (Squirrel) — light single-engine utility helicopter

Characteristics and design

The typical AS-350 configuration features a three-blade main rotor, a conventional tail rotor for anti-torque control and skid-type landing gear. Most single-engine variants use a turboshaft engine that provides a favorable power-to-weight ratio and reliable cruise performance; higher-power derivatives improve hot-and-high capability for mountainous operations. The cabin is adaptable: seating layouts range from multi-passenger transport to dedicated medevac interiors, and the airframe accepts external loads via a cargo hook. Common options include flotation gear for overwater work, wire strike protection, and mission equipment packs for law enforcement and aerial survey. Many operators consult manufacturer pages and technical summaries for equipment lists and certification details company information.

Development and variants

Over its production life the basic AS-350 spawned several subtypes emphasizing engine power, strengthened components or upgraded avionics. A notable twin-engine derivative was produced to satisfy different market and regulatory needs; both single- and twin-engine versions have been adapted for specific commercial and governmental roles. Certain high-performance single-engine models are optimized for extreme-altitude work and have been used in documented high-elevation operations. Incremental improvements to avionics, rotors and engines have allowed the type to remain competitive with contemporaries such as the Bell family of light helicopters, commonly compared with models like the Bell series and the Bell 206.

Operational roles and users

The AS-350 is popular across a wide range of civil applications: emergency medical services, law enforcement, aerial firefighting support, aerial work (photography, surveying and power-line inspection), tourism and offshore logistics. Militaries and security forces also use the type for training, reconnaissance, light transport and liaison duties; its adaptability, availability of mission equipment and global maintenance network make it attractive to many smaller air arms and government agencies on military employment. Civil case studies and operator reports illustrate its use in mountainous regions, remote services and urban operations civil applications.

Maintenance, safety and legacy

Like all widely used rotorcraft, AS-350 fleets require structured maintenance programmes and pilot training matched to the variant and the intended mission. The aircraft's long production run has produced good parts availability and extensive field support, but capability and equipment vary by subtype and operator. The AS-350 remains notable for its broad adoption, adaptability to mission kits, and an operational record that has kept it in service with civil operators, emergency services and armed forces worldwide.

• Key advantages: modular cabin, strong aftermarket support, good hot-and-high performance in suitable variants.
• Common roles: EMS, law enforcement, aerial work, training and light transport.