Introduction
The Nigerian Safety Investigation Bureau (NSIB) was notified by the Nigeria Civil Aviation Authority (NCAA) on 26 January 2024 of a serious incident involving a Challenger 601-3R aircraft, registration N580KR, owned and operated by Mattini Airline Services Ltd. The incident occurred at Ibadan Airport, Oyo State, at approximately 11:55 local time. Investigators were dispatched and arrived the same day.
History of the Flight
On 26 January 2024 at 11:05, the aircraft departed Nnamdi Azikiwe International Airport, Abuja, for Ibadan as a private flight under Instrument Flight Rules. On board were 15 persons: two cockpit crew, one cabin crew, and 12 passengers. The captain was the pilot flying, and the first officer was the pilot monitoring.
At 11:30, the crew contacted Ibadan Air Traffic Control (ATC) and provided flight details. The duty controller requested estimates, and the crew gave 11:55 as the expected arrival time. The controller cleared the aircraft for the RNAV approach to runway 22 and passed weather information: wind 050/08 knots, visibility 1,500 meters in haze, no significant cloud, QNH 1016, temperature 27°C.
During approach, the crew reported a flap failure when attempting to lower flaps beyond the 200 setting. The Quick Reference Handbook instructed adding 30 knots to the approach speed, resulting in a target speed of 164 knots (Vref was 134 knots). The crew also noted a quartering tailwind, which became a direct tailwind at the threshold. This caused the aircraft to float and touch down further down the runway than intended.
After landing, the aircraft overran the runway, traveling approximately 236 meters into the clearway beyond the end of runway 22. During the overrun, the mid-section of the left-wing leading edge struck an approach light, causing a dent (2x1.5x0.25 inches) and breaking the light. The aircraft came to a stop intact.
The crew did not report the flap failure to ATC. All occupants disembarked safely without injuries. The Aerodrome Rescue and Fire Fighting Service responded but found no smoke or fire.
Injuries and Damage
No injuries were reported among the 15 occupants. The aircraft sustained slight damage, limited to the dent on the left-wing leading edge. One approach light on runway 04 was broken.
Flight Recorders
The aircraft was equipped with a 30-minute Fairchild cockpit voice recorder (CVR). The recorder was recovered and downloaded, but the sequence of events was not captured due to the limited recording duration and the recorder not being disengaged after landing.
Medical and Toxicological Information
Toxicological tests conducted on the crew were negative.
Meteorological and Aerodrome Information
Weather at the time of the incident was daylight with visual meteorological conditions. Ibadan Airport has a runway 04/22 of 2,400 x 45 meters, equipped with a precision approach lighting system. The aircraft touched down beyond the touchdown zone, as evidenced by tire marks starting 214 meters from the end of the runway.
Organizational Information
Mattini Airline Services Ltd., based in Abuja, holds a permit for non-commercial flights. The investigation is ongoing under the Nigerian Safety Investigation Bureau.