1966 Felthorpe Trident crash
On 3 June 1966, a newly built Hawker Siddeley Trident jetliner crashed during a pre-delivery test flight near the village of Felthorpe, Norfolk, England, killing all four crew. The aeroplane had entered a deep stall from which the crew were unable to recover.
Source: Wikipedia — 1966 Felthorpe Trident crash (CC BY-SA 4.0)