ASN Wikibase Occurrence # 39130
Last updated: 21 August 2014
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Date:06-OCT-1992
Time:1100
Type:Swich II
Owner/operator:private
Registration: N4663A
C/n / msn: 2
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:El Mirage, CA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Private
Departure airport:
Destination airport:
Narrative:
THE PILOT WAS CONDUCTING A LOCAL PERSONAL FLIGHT OVER A DRY LAKE TO TEST A MODIFICATION ON THE MOTORIZED GLIDER. THE PILOT TOLD FRIENDS THAT HE INTENDED TO 'DO SOME STALLS.' AFTER EXECUTING SOME BASIC TURNS AND TAKEOFFS AND LANDING, THE PILOT DEPARTED THE AREA. A WITNESS OBSERVED THE AIRCRAFT IN A SPIN AND SAW IT CRASH. THE PILOT/OWNER RECENTLY INSTALLED A VERTICAL STABILIZER BETWEEN THE EXISTING RUDDERVATORS FOR BETTER LATERAL STABILITY IN THE MOTORIZED GLIDER. EXAMINATION OF THE WRECKAGE DISCLOSED NO EVIDENCE OF ANY PREEXISTING CONTROL MALFUNCTIONS OR FAILURES. A HOME BUILT DESIGN ENGINEER REPORTED THAT THE INCLUSION OF THE VERTICAL STABILIZER WOULD ADVERSELY EFFECT THE SPIN RECOVERY CHARACTERISTICS OF THE AIRCRAFT BY BLANKING OUT THE SIDE OF THE RUDDERVATOR OPPOSITE TO THE SPIN. CAUSE: THE PILOT/OWNER'S IMPROPER INSTALLATION OF THE VERTICAL STABILIZER. CONTRIBUTING TO THIS ACCIDENT WAS THE PILOT'S INTENTIONAL STALL, INADVERTENT SPIN, AND INABILITY TO RECOVER FROM THE SPIN DUE TO THE INADEQUATE EQUIPMENT (VERTICAL STABILIZER) DESIGN.

Sources:
NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X15896


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
Number of views: 595

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