Pilot Debrief

ALONSO CH 701 near Dexter, MI — 2016-07-10

Final reportCEN16LA264
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Date
2016-07-10
Location
Dexter, MI, USA
Aircraft
ALONSO CH 701
Registration
N701ZG
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Cruise

Probable cause

The total loss of engine power for reasons that could not be determined because postaccident examination of the engine revealed no mechanical malfunctions or failures that would have precluded normal operation.

NTSB narrative

The sport pilot was conducting a personal cross-country flight in the experimental, amateur-built airplane. He reported that, during cruise flight, the engine began running roughly and that he then landed at a nearby airport to examine the engine. The pilot was not able to determine what caused the roughness. He started the engine and performed a run-up, which was normal, so he departed to continue the flight. While en route, the engine again started running roughly and subsequently experienced a total loss of power. The pilot chose to conduct a forced landing in a soybean field, during which he had to lower the pitch altitude to fly under power lines, which resulted in an increase in airspeed and subsequent hard impact in the field. A postaccident examination of the engine revealed no mechanical malfunctions or failures that would have precluded normal operation. The weather conditions at the time of the accident were not conducive for the accumulation of carburetor ice at cruise power.

Analysis

Primary failure mode
Engine power loss
First missed decision gate
Pilot could have chosen to land after first engine roughness at OZW.

NTSB coding

Evidence available

  • 3 docket documents
View NTSB final reportView NTSB docket

Docket documents3

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