What happened
On 27 October 2015, a Cessna 208B Grand Caravan, registration PK-RSE, was conducting a charter flight from Wamena to Sinak Airport in Papua, Indonesia. The aircraft was transporting 1,178 kg of cargo with two pilots on board.
While descending through 9,000 feet, approximately 12 nautical miles from the destination, the pilot experienced a sudden loss of engine power. In an attempt to restore thrust, the pilot moved the power lever three times, but the engine failed to respond. The crew maintained a speed of 95 knots and continued a descent at 800 feet per minute.
During the final approach to runway 26, the aircraft encountered shifting winds, transitioning from a 13-knot headwind to a 13-knot tailwind. This wind shift made the aircraft difficult to control, prompting the pilot to execute an emergency landing procedure. Shortly before touchdown, the fuel shutoff valve was closed. The aircraft struck the ground roughly 75 meters before the start of the runway, veered to the left, and came to a stop 10 meters from the runway threshold. While all occupants evacuated without injury, the aircraft sustained substantial damage, including a bent wing, damaged landing gear, and a broken nose cowling.
The investigation
The KNKT investigation examined the aircraft's mechanical state and the flight conditions. Investigators noted that the engine compressor air intake screen contained debris, including grass, mud, and small wood stalks. The investigation also reviewed the aircraft's maintenance records, noting a valid certificate of airworthiness, and examined the pilot's experience, noting that this was only the second flight to Sinak for both crew members.
Findings
- The engine failed to respond to power lever inputs during the descent.
- Debris such as grass, mud, and wood stalks were found on the engine compressor air intake screen.
- Shifting wind conditions during final approach contributed to the difficulty in controlling the aircraft.
- The aircraft landed significantly short of the runway threshold.
Safety action
The KNKT has issued a safety recommendation to the operator, PT. Enggang Air Services, to enhance pilot emergency training specifically regarding engine malfunctions.