AAIB investigation to Pitts S-1C (Modified), G-BTOO
Elevator control became disconnected inflight, Popham Airfield, Hampshire, on 27 March 2022.
Summary:
Whilst on a test flight, after an extensive rebuild, the pilot became aware the elevator was no longer connected to the control column. He was able to maintain control, but during the final stages of approach, the aircraft pitched nose down and landed heavily on the forward fuselage; it came to rest inverted. The pilot received a severe laceration to the head and was assisted from the aircraft before being taken to hospital.
The investigation identified that a pivot joint at the end of an elevator pushrod had become disconnected, most probably due to the lack of a split pin to prevent the securing bolt’s castle nut from loosening.
Although not directly linked to this accident, discrepancies were found regarding adherence to LAA guidance for recording work. Inconsistencies were identified within LAA Technical Leaflets regarding who can sign for duplicate inspections. It was also noted that the extent to which the 51% rule for amateur built aircraft needs to be applied in relation to overhaul, repair, and restoration of amateur built aircraft was not clear in regulatory material. The Civil Aviation Authority (CAA) has stated it will be taking two Safety Actions, and the Light Aircraft Association (LAA) has stated it will be taking two Safety Actions to address these issues.
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