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Fri, Jun 07, 2024

NTSB Final Report: Powrachute Pegasus

Large Heavy-Duty Deer Feed Bag Obstructed The Radiator Inlet And Restricted Its Designed Cooling Capability

Location: Manhattan, Kansas Accident Number: CEN24LA031
Date & Time: October 21, 2023, 08:28 Local Registration: N52631
Aircraft: Powrachute Pegasus Aircraft Damage: Substantial
Defining Event: Miscellaneous/other Injuries: 2 Serious
Flight Conducted Under: Part 91: General aviation - Personal

Analysis: Before departing on the local area flight in the experimental powered parachute, the pilot installed a large heavy-duty deer feed bag that partially covered the radiator. He was concerned that the experimental engine would run “too cold” during the flight unless the radiator was partially covered.The powered parachute was flying about 400 ft above ground level when the pilot noticed that the engine overheat light illuminated. The pilot decided to continue flying. 

Shortly after, the engine sustained a total loss of engine power. The pilot performed a forced landing to a road and the powered parachute came to rest upright on a 
grass embankment near the road. The powered parachute sustained substantial damage to the fuselage and engine mount. Postaccident examination revealed no mechanical anomalies with the engine. The large heavy duty deer feed bag was found covering about 3/4 of the radiator surface area and was secured with two bungee cords. According to the airframe and engine manufacturers, neither company has published any guidance on covering up the radiator for flight operations.

The large heavy-duty deer feed bag obstructed the radiator inlet and restricted its designed cooling capability. The engine then did not have a source of adequate cooling, which likely resulted in the engine overheating and a total loss of engine power. The pilot noticed the engine overheat light was illuminated and continued with normal flight operations when guidance from the engine manufacturer states to perform a precautionary landing.

Probable Cause and Findings: The National Transportation Safety Board determines the probable cause(s) of this accident to be -- The pilot’s improper modification of the engine cooling system that resulted in an engine overheat and total loss of power. Contributing to the accident was the pilot’s decision to continue the flight after the engine overheat light illuminated instead of performing a precautionary landing.

FMI: www.ntsb.gov

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