The Left Engine Decreased From 2,400 RPM To 1,000 RPM Briefly And Increased Back To 2,400 RPM

Location: Nephi, UT Accident Number: WPR23LA220
Date & Time: June 8, 2023, 12:19 Local Registration: N7318Y
Aircraft: Piper PA-30 Injuries: 1 None
Flight Conducted Under: Part 91: General aviation - Personal

On June 8, 2023, about 1219 Mountain daylight time, a Piper PA-30, N7318Y, was substantially damaged when it was involved in an accident near Nephi, Utah. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.

The pilot reported that he departed Cedar City Regional Airport (CDC), Cedar City, Utah, to relocate the airplane to Skypark Airport (BTF), Bountiful, Utah, for an annual inspection. While in cruise flight, about 9,500 msl, the left engine decreased from 2,400 rpm to 1,000 rpm briefly and increased back to 2,400 rpm. The pilot attempted to troubleshoot the left engine, however, it continued to cycle sporadically between 1,000 and 2,400 rpm. The pilot diverted to the Nephi Regional Airport (U14), Nephi, and initiated a straight in approach to runway 17.

During the landing flare, about 5 feet above the runway, the left engine lost all power. The pilot immediately applied right rudder to counteract the lowered left wing, however, the airplane touched down and exited the left side of the runway. Subsequently, the airplane impacted a dirt mound and came to a rest in an open field, which resulted in substantial damage to the right wing.

The airplane was recovered to a secure facility for further examination.

FMI: www.ntsb.gov