Sunday, September 27, 2020

Zenith STOL CH 750, N210WP: Accident occurred September 20, 2020 in Montrose, Henry County, Missouri

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity: 
Federal Aviation Administration / Flight Standards District Office; Kansas City, Missouri 

Aviation Accident Preliminary Report - National Transportation Safety Board:  https://app.ntsb.gov/pdf


Location: Montrose, MO
Accident Number: CEN20LA412
Date & Time: 09/20/2020, 1145 CDT
Registration: N210WP
Aircraft: ZENITH CH 750
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Personal 

On September 20, 2020, about 1145 central daylight time, a William Prosch Zenith 750 airplane, N210WP, was substantially damaged when it was involved in an accident near Montrose, Missouri. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.

According to the pilot, while en route to his destination airport, the engine momentarily lost power. He immediately selected the alternate fuel pump and engine control unit (ECU), and the engine regained power. About 5 minutes later, the engine lost total power, and the pilot attempted to restart the engine. The engine restart was unsuccessful, and the pilot initiated a forced landing to a field. During the forced landing, the airplane's landing gear contacted the high vegetation, and the nose impacted terrain. The airplane nosed over and came to rest inverted. The airplane's left wing leading edge was crushed, and the rudder was bent.

Postaccident examination of the airplane revealed the main fuse block, located behind and under the instrument panel, was discolored and exhibited internal thermal damage. An automotive blade-type fuse, that connected to both primary and secondary fuel pumps and primary and back up ECUs, displayed arching signatures and had failed. According to the engine manufacturer, who responded to the accident site, the primary and secondary ECUs should have been wired directly to the main buss and should not have contained a fuse. After bypassing the failed electrical system, an engine test run was performed. The engine started and operated normally with no mechanical issues noted.

The engine manufacturer has a service bulletin that recommends an ECU wiring upgrade. The upgrade removes the ECU select switch in order to operate on a single computer only. The service bulletin had not been completed on the accident experimental airplane, nor was it required to be completed. 

Aircraft and Owner/Operator Information

Aircraft Make: ZENITH
Registration: N210WP
Model/Series: CH 750
Aircraft Category: Airplane
Amateur Built: Yes
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation:
Observation Time:
Distance from Accident Site:
Temperature/Dew Point: 18°C
Lowest Cloud Condition: Clear
Wind Speed/Gusts, Direction: 8 knots / , 140°
Lowest Ceiling: None
Visibility:  10 Miles
Altimeter Setting:
Type of Flight Plan Filed: None
Departure Point: Clinton, MO (GLY)
Destination: Parsons, MO (0KS8)

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 38.250000, -93.890000 (est)

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