Casualties unknown

2007-06-17: American Aviation Corp. (aac) AA-1 (N5651L) — Lansing, IL

Lansing, IL, US

On June 17, 2007, an American Aviation Corp. (aac) AA-1 (registration N5651L) was involved in an aviation accident near Lansing, IL. Investigators recorded the probable cause as: Loss of engine power likely due to fouled #1 and #3 cylinder spark plugs and a bent #3 exhaust valve. 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 1781061362Data APIEditorial standards

A pilot experienced a loss of engine power during climb after takeoff, leading to a forced landing on a golf course fairway. The airplane struck trees and sustained substantial damage. Postaccident inspection revealed fouled spark plugs and a bent exhaust valve.

Accident Sequence

The airplane sustained substantial damage when it impacted trees and terrain following a loss of engine power after takeoff. The incident occurred on the third takeoff, approximately 900 feet above ground level, when the engine rpm began to drop and the stall warning horn activated. The pilot held the throttle full in, but engine speed decreased to less than 1,000 rpm.

Pilot Report

As the airplane lost altitude, it passed just above power lines. The pilot observed a golf course and a road, and the airplane began to buffet. He decided to land on the golf course fairway. During the approach, the left wing stalled, causing the airplane to roll left. The pilot pushed the nose over and recovered just before the right wing struck a tree. The airplane subsequently crashed on the fairway.

Postaccident Inspection

Examination of the engine revealed that the #1 and #3 cylinder spark plugs were fouled, and the #3 exhaust valve was bent. These conditions likely resulted in the loss of engine power. No other anomalies were noted. The engine had accumulated 1,749 service hours since new and had not undergone an overhaul.

Probable cause

Loss of engine power likely due to fouled #1 and #3 cylinder spark plugs and a bent #3 exhaust valve.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20070711X00908. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.