On May 11, 1991, a Piper J3 (registration N88441) operated by Mki Incorporated was involved in an aviation accident near Creston, IA. Investigators recorded the probable cause as: ICING IN THE INDUCTION AIR CONTROL SYSTEM. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An experimental exhibition-certificated airplane was substantially damaged after colliding with rough terrain during a forced landing following a partial loss of engine power. The aircraft had been modified with shortened wings and a fuel-injected engine without induction heating or alternate air.
Accident Details
An experimental exhibition-certificated airplane experienced a partial loss of engine power while on a personal flight. The pilot initiated a forced landing, but the airplane subsequently collided with rough, uneven terrain. The impact resulted in substantial damage to the aircraft. No defects were discovered in the airframe or powerplant during post-accident examination.
Aircraft Modifications
The accident airplane had been extensively modified prior to the flight. The modifications included a reduction in wingspan and the installation of an engine that had been modified for fuel-injected operation. Notably, the modification did not include any provisions for induction system heating or a means of providing an alternate air source.
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