…Recommends NCAA to inspect all Allied Air airplanes

ABUJA – The Nigerian Safety Investigation Bureau (NSIB), has detailed how a Boeing 737-400 Freighter aircraft with nationality and registration marks 5N-JRT, operated by Allied Air Ltd., skidded of the Nnamdi Azikiwe International Airport on December 11, 2024.

A preliminary report issued by the bureau on Saturday on the cause of the accident explained that the aircraft had valid Certificate of Airworthiness among others.

According to the report, Safety Recommendation 2025-001 says the Nigeria Civil Aviation Authority should inspect all Allied Air aircraft for potential mechanical and structural vulnerabilities, including Flap and Landing Gear Systems.

The preliminary findings, the flight crew members held valid, current licence and were qualified to conduct the flight, the aircraft had a valid Certificate of Airworthiness; the aircraft came in from Doula, Cameroon, on the day of the occurrence and there were no snags logged in the aircraft technical logbook.

“The flight was a cargo revenue flight; the aircraft was scheduled for six sectors: Lagos-Abuja, Abuja-Sokoto, Sokoto to Abuja, Abuja-Yola, Yola-Abuja, and Abuja-Lagos. The same flight crew would operate the flights.

“The incident occurred in the first sector, and there was no cargo on the flight.The flight crew stated that during the Final Approach, flap 30 was selected, but the flaps did not move to the commanded position; they stopped at flap 15.

“The flight crew reported hearing a bang from the aircraft’s right side as the wheels touched down on the runway surface. The aircraft collapsed to the right when the crew attempted to maintain directional control.”

The report said the Right Main Landing Gear Assembly detached from the aircraft, and as the landing roll continued, the Engine number two nacelle dragged on the runway surface until the aircraft veered off to the right of runway 22 center-line and came to a stop on the grass verge.

After landing, debris was observed falling from the rear side of the aircraft’s undercarriage and the Abuja Tower immediately alerted Aerodrome Rescue and Fire Fighting Services (ARFFS) of the occurrence.

“The No.3 and No.4 Main Wheel Tyres busted; the post-occurrence inspection did not reveal evidence of a Hard Landing.

“The FDR data indicated that from 01 November 2024 to the day of occurrence, the aircraft had performed a total of 101 landings out of which 85 were flap 15 landings,” it described.

NSIB also revealed an ongoing test and inspection of the flap drive system components, including the transmission assemblies (transmission gearboxes, universal joints, ball nuts, flap tracks, jackscrew actuators as well as detailed inspection and examination of the Right Main Landing Gear Assembly.