What happened
On September 9, 2024, at approximately 17:10 local time, a Cessna 182P, registration HK-1937, was conducting a commercial air taxi flight from Belén de Inambú to Mitú, Colombia. While on final approach to the Mitú airport, approximately 1 km from runway 02, the pilot declared a "Mayday" after experiencing a total loss of engine power.
The pilot executed a controlled emergency landing (water landing) on the Vaup ands River, located in the final approach path of the runway. The pilot, the sole occupant of the aircraft, successfully evacuated the aircraft via the door before it sank. The pilot was subsequently assisted by a military vessel and transported to a medical center in Mitú, where they were treated for minor contusions.
The investigation
The GRIAA investigation focused on the mechanical condition of the Continental O-470-R engine and the aircraft's fuel system. Technical inquiries were made to the manufacturers, Cessna and Continental, to verify the aircraft's configuration and maintenance standards.
Investigators discovered that the aircraft was equipped with integral fuel tanks, whereas the manufacturer's specifications for this specific serial number required bladder-type tanks. Furthermore, the inspection of the engine revealed significant irregularities, including severe corrosion and cracks in the exhaust manifold, and evidence of unprofessional repairs. The inspection of the cylinders showed highly inconsistent combustion patterns, with some cylinders exhibiting heavy carbon deposits and others showing signs of oil burning and potential overheating. Additionally, investigators found that PRC sealant had been applied in a manner that obstructed the fuel finger strainers.
Findings
- Total loss of engine power caused by a fuel system obstruction and systemic engine failure.
- The aircraft was equipped with unauthorized integral fuel tanks instead of the required bladder-type tanks.
- Improper maintenance practices, including the use of excessive PRC sealant that obstructed fuel filters.
- Severe engine component degradation, including corrosion in the exhaust system and inconsistent cylinder performance.
- Presence of corrosion and mold within the fuel tanks without adequate cleaning or control measures.
- Inadequate maintenance program regarding the inspection and repair of the intake and exhaust systems.