On August 21, 1983, a Champion 7GCAA (registration N100ES) was involved in an aviation accident near LA Jolla, CA. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced engine sputtering and backfiring, had spark plugs changed, then resumed flight. Offshore, the engine sputtered again, the banner was released, and the aircraft stalled and struck the water. Post-accident examination revealed multiple mechanical failures.
Pre-Departure Engine Issues
Before departure, the aircraft was observed during an engine run-up with the engine sputtering and backfiring quite badly. The aircraft returned to the hangar, where three lower spark plugs were changed. The flight was then resumed.
In-Flight Events
The aircraft was next observed offshore with the engine sputtering and missing, and the banner having been released. The aircraft then pitched up, stalled, and struck the water.
