What happened
On 1 February 2017, a Boeing 737-800, registration PK-GNK, was operating a scheduled passenger service from Jakarta to Yogyakarta. The flight, operated by PT. Garuda Indonesia, was carrying 119 passengers and six crew members.
During the landing phase at Adisutjipto International Airport, the aircraft encountered light rain and wet runway conditions. After touching down on runway 09, the aircraft began to veer to the left while the crew was applying reverse thrust. The aircraft eventually came to a stop on the left shoulder of the runway, approximately 20 meters from the runway edge and 1,600 meters from the threshold. While the aircraft sustained no damage and there were no injuries, the incident required an emergency evacuation of all passengers.
The investigation
The KNKT examined the flight data recorder (FDR) and cockpit voice recorder (CVR) to reconstruct the landing roll. The investigation focused on the aircraft's technical status, the meteorological conditions, and the maintenance of the aerodrome. Investigators reviewed the aircraft's airworthiness, finding no technical abnormalities prior to the event. The investigation also scrutinized the airport's maintenance records, specifically regarding rubber deposit removal and runway friction testing, as well as the clarity of runway markings.
Findings
- The aircraft was airworthy and no technical malfunctions were recorded.
- The runway surface was wet due to light rain at the time of the incident.
- FDR data indicated variations in wind speed and direction, as well as asymmetric braking pressures and rudder deflections during the landing roll.
- Unclear runway centerline markings were identified in the touchdown zone of runway 09.
- There was a discrepancy between the airport's Aerodrome Manual and Standard Operating Procedures regarding the frequency of daily runway inspections.
- The last recorded runway friction test had been conducted several months prior to the event.
Safety action
Following the incident, Garuda Indonesia issued a notice to flight crews reminding them to maintain safety protocols during the rainy season. Additionally, an announcement was made to cabin crew regarding the implementation of evacuation procedures during aircraft incidents.