Incident Overview
On 6 August 2013, a Boeing 737-800 aircraft, registration PK-LKH, operated by PT. Lion Mentari Airlines (Lion Air) as flight LNI 892, was on a scheduled passenger service from Sultan Hasanuddin Airport, Makassar, to Djalaluddin Airport, Gorontalo, Indonesia. The aircraft had previously operated from Soekarno-Hatta Airport, Jakarta, to Makassar. The flight crew consisted of a Pilot in Command (PIC) acting as Pilot Flying and a Second in Command (SIC) acting as Pilot Monitoring. There were two pilots, five flight attendants, and 110 passengers (104 adults, 1 child, 5 infants) on board.
Sequence of Events
During the approach to Gorontalo, the weather was clear. At 1313 UTC, the aircraft touched down on runway 27. During the landing roll, the flight crew observed animals crossing the runway ahead. Approximately 550 meters from the runway threshold, at a speed of about 120 knots, the aircraft struck the animals. After the impact, the pilots noted ineffective brake response, and the aircraft veered to the left, coming to rest on the left shoulder of the runway approximately 2,100 meters from the threshold. A smell of burning meat entered the cabin and dissipated after engine shutdown.
The Djalaluddin Tower issued a taxi clearance at 1314 UTC, which was not acknowledged by the pilots. At 1315 UTC, the pilot informed the tower that the aircraft had struck animals and stopped on the left shoulder, requesting confirmation of no fire and assistance from Airport Rescue and Fire Fighting (ARFF). The tower confirmed no fire was visible.
The PIC instructed passengers to remain seated and await further instructions. However, some passengers evacuated via the right over-wing emergency window without authorization. Two passengers sustained sprained ankle muscles as a result of evacuating without crew guidance. After ARFF arrived and confirmed no fire, the PIC ordered disembarkation via the right forward and aft service doors using rescue stairs.
Aircraft and Crew
Both pilots held valid licenses and medical certificates. The aircraft was properly certified, equipped, and maintained in accordance with Indonesian regulations.
Damage
Two dead cows were found on the aircraft's main landing gear. The aircraft sustained damage to the brake system hydraulic lines and the Weight on Wheel sensor.
Passengers and Injuries
Two passengers suffered sprained muscles around the ankle due to the unauthorized emergency window evacuation.
Wildlife Hazard Management Issues
The investigation identified that some perimeter fences along the north and south sides of the runway, extending approximately 500 meters, were broken or missing. Additionally, a previous audit had identified broken perimeter fences, but the corrective action program had not been implemented. This condition was considered to have allowed a high wildlife hazard along the runway.