What happened
On April 8, 2001, a Cessna Citation X, registration OH-PPI, operated by Airfix Aviation, performed an emergency landing at Helsinki-Vantaa Airport following a landing gear malfunction. The flight originated from Saint Petersburg, Russia, carrying two crew members and two passengers.
During the initial climb, the crew retracted the landing gear but noticed the "gear unsafe" warning light remained illuminated and heard unusual aerodynamic noises. After attempting to cycle the gear, the crew found that while the main landing gear deployed successfully, the nose gear remained retracted. The gear lever became immobilized in the down position.
Following the manufacturer's emergency checklist, the crew attempted both the free-fall and the hydraulic pressure release methods to extend the nose gear, but neither was successful. The crew decided to proceed to Helsinki, adhering to speed and altitude restrictions necessitated by the gear configuration. Upon arrival, the crew requested a runway foam application as a precaution. The aircraft touched down at approximately 88 knots, and the nose subsequently impacted the runway at 61 knots. The aircraft came to a stop approximately 140 meters after the nose strike. There were no injuries to the occupants, and the aircraft sustained only minor damage.
The investigation
The investigation examined the mechanical failure of the nose gear, the crew's use of emergency procedures, and the effectiveness of the airport's rescue response. Investigators analyzed flight data recorders and cockpit voice recordings, with specialized audio analysis conducted in collaboration with forensic experts.
Technical analysis of the nose gear components was conducted at the Cessna factory in the United States, overseen by the NTSB. The investigation focused on the nose gear up-lock mechanism, the status of the nose gear strut pressure, and the adequacy of the aircraft's emergency checklists and maintenance protocols.