1963 BAC One-Eleven test crash
The 1963 BAC One-Eleven test crash was a fatal accident of a British Aircraft Corporation prototype aircraft on 22 October 1963, near Chicklade in Wiltshire, England while it was undertaking a test flight. All seven crew members on board the BAC One-Eleven were killed.
Source: Wikipedia — 1963 BAC One-Eleven test crash (CC BY-SA 4.0)