On April 11, 1992, a Maule M-5-210 (registration N51590) operated by Air Ads, Inc. was involved in an aviation accident near Atlanta, GA. Investigators recorded the probable cause as: Number three cylinder failed as a result of fatigue due to heat stress. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.
A pilot performing a banner towing operation experienced a total engine power loss after hearing a loud bang, leading to a successful off-airport landing in a parking lot. Investigation revealed the number three cylinder failed due to fatigue from heat stress, with the engine having been modified with an additional oil cooler.
Incident Details
During a banner towing operation, the pilot heard a loud bang followed by a complete loss of engine power. The pilot executed an off-airport landing in a parking lot, which was successful.
Examination Findings
Post-incident examination of the aircraft revealed that the number three cylinder had failed. The failure was attributed to fatigue resulting from heat stress.
Engine Modification
The engine was found to have been modified with an additional oil cooler. This modification was intended to help maintain oil temperature within the operating range during banner towing operations.
Probable cause
Number three cylinder failed as a result of fatigue due to heat stress.