Casualties unknown

Engine power loss due to faulty primer lock leads to nose-over accident (N2906Z)

Mankato, MN, US

On May 21, 1991, a Piper PA-22-160 (registration N2906Z) operated by Steve/chris Napier was involved in an aviation accident near Mankato, MN. Investigators recorded the probable cause as: A faulty engine primer lock that caused a partial loss of engine power shortly after takeoff. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

A pilot experienced a partial loss of engine power shortly after takeoff and attempted an emergency landing in a field, resulting in a nose-over. Investigation revealed a faulty engine primer lock.

What happened

The pilot reported that shortly after takeoff, the aircraft experienced a partial loss of engine power. In response to this mechanical issue, the pilot attempted an emergency landing in a nearby farm field. The landing resulted in the aircraft nosing over.

The investigation

Post-accident examination of the aircraft revealed a faulty engine primer lock. During the inspection, when the engine was run up and the primer became unlocked, the engine RPM would drop significantly. This mechanical behavior coincided with the pilot's statement regarding the loss of power during flight.

Probable cause

A faulty engine primer lock that caused a partial loss of engine power shortly after takeoff.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16954. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.