HS 125 Series 400

The HS 125 Series 400 is a midsize business jet that reflects Hawker Siddeley's transition from military aircraft to the lucrative corporate aviation market in the 1960s. First flown on 24 October 1966 and approved for service in 1968, the Series 400 built on the earlier HS 125-200 model with a longer fuselage, larger cabin, and upgraded engines. Powered by two Garrett TFE731-3 turbofan engines, the aircraft delivers 3,500 pounds of thrust each, providing a cruise speed of Mach 0.78 and a range of roughly 2,300 nautical miles, enough to connect major European and North American hubs nonstop. The pressurised cabin, measuring 7.1 meters in length, features a flexible interior layout that can accommodate 8‑10 passengers with a conference‑style arrangement or a luxurious lounge configuration. Advanced avionics for the era, including an automatic flight control system and a reliable inertial navigation suite, enhanced safety and reduced pilot workload. The HS 125‑400 earned a reputation for reliability, low operating costs, and smooth ride quality, making it a favorite among corporate flight departments and charter operators. Its success paved the way for later Hawker models such as the HS‑125‑700 and the modern Hawker 800 series, cementing Hawker Siddeley's lasting impact on business‑jet development.

Hawker Siddeley

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Design & Classification