No fatalities

Piper PA-31-350 Navajo Forced Landing in Manitoba (C-GHMK)

Manitoba, CanadaFlight

On August 29, 1999, a Piper PA-31-350 Navajo Chieftain (registration C-GHMK) operated by Sowind Air was involved in an aviation accident near Manitoba, Canada in flight. No fatalities were reported. Investigators recorded the probable cause as: The number three cylinder lower forward through stud was missing its base nut, which allowed the lower rear base nut of the number two cylinder to loosen. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 1 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-11Data APIEditorial standards

A Piper PA-31-350 Navajo, C-GHMK, force-landed in a marsh after left engine failure during a charter flight from St. Andrews to Berens River, Manitoba. All 12 occupants and a dog evacuated; five passengers were injured.

Flight Details and Accident Sequence On a visual flight rules charter flight from St. Andrews, Manitoba, to Berens River, a Piper PA-31-350 Navajo, registration C-GHMK, carried one pilot, ten passengers (including one infant), and a dog stowed in the baggage compartment. At approximately 1530 CDT, while at an altitude of about 2,500 feet and roughly 30 nautical miles south of Berens River, the pilot heard a loud sound from the left engine. He observed deformation of the left engine cowling and smoke, and the aircraft yawed to the left. Part of the cowling separated in flight. The pilot was unable to move the left propeller lever beyond half of its normal travel or into the feather position. Despite setting maximum power on the right engine, the aircraft could not maintain altitude. The pilot notified company dispatch of an intended forced landing and brought the aircraft down in a mossy marsh area. All occupants, including the dog, evacuated; five passengers sustained minor injuries. A subsequent fire destroyed the aircraft except for the empennage aft of the horizontal stabilizers.

Probable cause

The number three cylinder lower forward through stud was missing its base nut, which allowed the lower rear base nut of the number two cylinder to loosen. The d-inch studs and the 2-inch through studs of the number two cylinder failed in fatigue, causing the number two cylinder of the left engine to separate from the crankcase. The left propeller could not be feathered due to interference between the propeller governor control and the separated cylinder. Drag from the unfeathered left propeller and the deformed left engine cowling prevented the aircraft from maintaining altitude.