Introduction
On 9 September 2016, a Boeing 737-800 aircraft, registered JU-1015, operated by MIAT (Mongolian Airlines) on scheduled flight OM-502 from Tokyo Narita International Airport (NRT) to Ulaanbaatar, experienced a tire tread loss incident during take-off. The aircraft, serial number 41318, was manufactured in 2014 and powered by two CFM56-7B engines. The investigation was conducted by the Aircraft Accident Investigation Bureau (AAIB) of Mongolia.
Flight History
The aircraft departed Narita at 05:58 UTC. During take-off, the flight controller reported via radio that rubber pieces had separated from a tire. The flight continued to Chinggis Khaan International Airport in Ulaanbaatar, where the crew contacted air traffic control to assess the tire condition before landing. After landing, inspection revealed that the outer tread layer of the #4 main wheel had detached.
Injuries to Persons
On board were 11 crew members and 100 passengers. No injuries were reported among crew or passengers.
Damage to Aircraft
The detachment of tire tread pieces caused impact damage to the aircraft structure. Specific damage included:
- Dents on the right wing inboard flap surface (three locations, 0.4–0.55 mm depth) and outboard flap surface (four locations, 0.35–4.8 mm depth).
- Four dents on the #7 spoiler lower surface (0.88–4.44 mm depth).
- Curled edge of the right landing gear upper door and a crack in the lower door rear section.
- Six dents on the rear lower wing panel (0.25–0.76 mm depth).
The #4 wheel was rendered unserviceable. The flap spars and stiffening ribs were undamaged.
Other Damage
No other damage was reported.
Personnel Information
The captain was a 44-year-old male Mongolian national with an Airline Transport Pilot License (ATPL) and a B737-800/IR type rating valid until 10 May 2017. He held a Class 1 medical certificate valid until 23 February 2017. His total flying experience was approximately 9,000 hours, with over 550 hours on the B737-800. He had previously flown as a co-pilot on An-24/26 and as captain on A310-300, A300-600, and B767-300 aircraft.
Maintenance personnel details were not fully available in the provided source.
Aircraft Information
The aircraft was a Boeing 737-800 with serial number 41318, manufactured in 2014. It was equipped with two CFM56-7B engines. The tire involved was the #4 main wheel.
Conclusion
The incident involved a tire tread loss during take-off. The probable cause was not explicitly stated in the provided source material.