On August 15, 1983, a Grumman G-164A (registration N7904) operated by Mcbryant Flying Service was involved in an aviation accident near Hatley, GA. Investigators recorded the probable cause as: The exhaust stack worked loose in flight, directing excessive heat toward the #2, 3, and 4 cylinder heads, causing them to melt off. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
While spraying a cotton field at about 60 feet AGL, the engine made a popping sound and lost power. The pilot landed in the field, but the aircraft rolled over and was destroyed by fire. Examination revealed a loose exhaust stack caused excessive heat to #2-4 cylinders.
Incident Description
The pilot reported that while spraying a cotton field at approximately 60 feet above ground level, the engine emitted a popping sound and subsequently lost power. The pilot executed a landing in the cotton field. During the landing, the aircraft rolled over onto its back and was consumed by a post-impact fire, resulting in its destruction.
Engine Examination
Subsequent examination of the engine revealed scoring on the number 5 cylinder. No oil was present in the crankcase, and no evidence of oil residue was found. The exhaust stack exhibited wear, and the number 2 and number 3 cylinders were damaged by excessive heat. The investigation indicated that the exhaust stack likely worked loose during flight, causing excessive heat to be directed toward the number 2, 3, and 4 cylinder heads, leading to their melting.
Probable cause
The exhaust stack worked loose in flight, directing excessive heat toward the #2, 3, and 4 cylinder heads, causing them to melt off.
What happened in the 15 Aug 1983 Grumman G-164A accident near Hatley, GA?
While spraying a cotton field at about 60 feet AGL, the engine made a popping sound and lost power. The pilot landed in the field, but the aircraft rolled over and was destroyed by fire. Examination revealed a loose exhaust stack caused excessive heat to #2-4 cylinders.
What aircraft was involved and where did it happen?
The accident on 15 Aug 1983 involved a Grumman G-164A, registration N7904, operated by Mcbryant Flying Service, at Hatley, GA.
What was the probable cause of the accident?
The exhaust stack worked loose in flight, directing excessive heat toward the #2, 3, and 4 cylinder heads, causing them to melt off.
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