Zenith 601XL N601YP

Summary

On 3 June 2023 at about 18:20 local time, a Zenith 601XL registered N601YP was involved in an accident near Albertville, Alabama, United States. One person was on board and one died. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

3 June 2023 at 18:20

Classification

Accident

Location

Albertville, Alabama, United States

Nearest airport

Albertville Rgnl-Thomas J Brum (8A0)

Coordinates

34.2760, -86.3003

Aircraft

Zenith 601XL

Registration

N601YP

Category

Airplane

Year built

2023

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Flight Test

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

ERA23FA254

1 person died.

A descent and impact with terrain for reasons that could not be determined.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

After troubleshooting oil pressure and airspeed indications issues with his electronic flight instrumentation and engine monitoring system, the pilot departed in the experimental amateur-built airplane on its third test flight. Data recovered from the airplane’s onboard electronic instruments showed that the airplane departed the airport traffic pattern and flew for about 30 minutes, performing several heading changes and climbing to 4,000 ft mean sea level (msl) before descending to level off at 2,050 ft msl. There was nothing unusual about the airplane’s flight profile and the maneuvers up to that point appeared to be normal. Witnesses to the final moments of the flight reported the airplane was flying slow at a low power setting. One witness reported the airplane stalled or pitched up and down, then stalled again before it rolled to the left and right and then descended behind the trees. Another witness reported the engine power increased to full power before the nose of the airplane pitched down. The pilot did not recover from the descent and the airplane impacted trees and terrain about 3 miles away from the airport. The recorded data for the final moments of the flight revealed a sequence of events that was generally consistent with the witness observations, and there were no apparent anomalies with the airplane’s engine preceding or during the final descent. Postaccident examination of the airframe, systems, and engine did not reveal evidence of any preimpact mechanical malfunctions or failures that would have precluded normal operation. Discrepancies observed in the recorded data, such as recorded changes to the roll angle and a relative lack of change of the airplane’s heading and ground track, as well as differences between the airplane’s indicated/true airspeeds and the recorded GPS groundspeeds suggested that the troubleshooting efforts the pilot was performing to the airplane’s electronic instruments may not have resulted in the system being fully functional and able to record reliable parametric data. Medical examination revealed the pilot was at increased risk of cardiovascular disease. No significant cardiovascular disease was identified during the pilot’s autopsy; however, the autopsy was limited by injuries that prevented examination of the pilot’s coronary arteries. Toxicology testing of specimens from the pilot was consistent with medication-treated diabetes, without severe high blood sugar at the time of the accident. While this condition was associated with some increased risk of impairment or incapacitation, there was no specific forensic evidence that a medical event contributed to the accident. Based on the available evidence, the reason for the airplane’s descent and impact with terrain could not be determined.

Quoted verbatim from the NTSB record.