Investigation Summary
The accident flight departed Feilding Aerodrome at 10:35 NZDT for a local aerobatic session. After receiving clearance to operate at 3,000 feet and later 3,500 feet, the pilot performed a loop and a stall turn. During a subsequent slow roll at 2,700 feet, the aircraft suddenly entered a 45 to 50 degree nosedive with the engine still producing power. Witnesses at Timona Park observed the aircraft in a high-speed dive, banking slightly right, before it struck the ground at 10:45 NZDT. Post-crash investigation by the Civil Aviation Authority of New Zealand (CAA) discovered a screwdriver 15 metres from the main wreckage. Physical evidence, including gouges on the left elevator attachment fitting and matching abrasions on the screwdriver handle, confirmed the tool had jammed the elevator. The investigation concluded the screwdriver had likely been left in the rear fuselage during maintenance and moved into a position to jam the controls when the aircraft was subjected to inverted flight and negative G-forces during the slow roll.
Final Conclusions
The Civil Aviation Authority of New Zealand concluded that the accident was caused by foreign object debris (FOD) restricting the elevator control system. The presence of a screwdriver in the rear fuselage, which was not detected during pre-flight inspections, led to a control jam during aerobatics. The CAA issued a mandatory Airworthiness Directive (DCA/YAK/8) following the findings to prevent similar occurrences in the Yak-52 fleet.
Photographic Evidence (1)
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Crew Experience
Captain
Dr. Ralph Saxe, aged 51. Facial sculpting surgeon.
Systems & Failure Modes
Elevator Control System
The mechanical linkage used to control the aircraft's pitch. In this event, a screwdriver jammed the elevator quadrant cable end fitting, preventing pitch recovery.
Rear Fuselage Cavity
The internal area of the tail section where the screwdriver was inadvertently left; the lack of a debris barrier allowed the tool to reach critical control components.
Interesting Facts
- 01The screwdriver was found 15 metres from the crash site with fresh abrasions matching the elevator quadrant.
- 02The aircraft had accumulated only 266.5 total flight hours at the time of the accident.
- 03The pilot held a private pilot licence with an aerobatic rating and 2,900 total hours.
- 04The Yak-52TW is a tail-wheel variant of the standard Yak-52 aerobatic trainer.
- 05The investigation determined the screwdriver entered the tail section via the top of the rear fuselage during inverted flight.
Safety Actions & Advisories
Airworthiness Directive DCA/YAK/8
Source ↗Mandated the installation of a debris barrier in the rear fuselage of all Yak-52 models to prevent foreign objects from interfering with control cables.
FOD Inspection Requirement
Required a thorough inspection of the entire fuselage for foreign object debris prior to the installation of the new barrier.
Location
ACCIDENT SITE · Coordinates taken from the wikidata coordinate.