BAC 111 Prototype elevator control
Surprising that BAC allowed this situation to go so far as it did, when other TP's who had flown the machine had already made adverse comments with regard to elevator authority and its lack of stability on landing. Even after the subsequent machines were modified yet another AC was written off at Wisley when the aircraft developed PIO on landing.
One would have thought the company took notice of what their TP's said !!!!