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ASN Wikibase Occurrence # 217247
Last updated: 26 March 2019
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Date:26-AUG-1993
Time:14:30
Type:Silhouette image of generic AC90 model; specific model in this crash may look slightly different
Aero Commander 690A
Owner/operator:Medic Air Inc.
Registration: N706KC
C/n / msn: 11343
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Bishop, CA -   United States of America
Phase: En route
Nature:Unknown
Departure airport:Reno, NV (RNO)
Destination airport:
Investigating agency: NTSB
Narrative:
A TWIN ENGINE TURBOPROP AIRPLANE WAS DESCENDING THROUGH 16,500 FEET AT 205 KNOTS WHEN THE AIRPLANE BEGAN AN UNCOMMANDED 360- DEGREE RIGHT ROLL. THE PILOT REGAINED CONTROL OF THE AIRPLANE AND CONTINUED HIS DESCENT AND LANDED. AFTER LANDING, THE PILOT FOUND THAT THE OUTBOARD HALF OF THE RIGHT HORIZONTAL STABILIZER HAD BROKEN, FOLDING UP AND AFT 180 DEGREES OVER THE UPPER SURFACE OF THE STABILIZER. THE FAILURE OF THE STABILIZER WAS ATTRIBUTED TO OVERLOAD. METEOROLOGICAL CONDITIONS WERE DESCRIBED AS A LIGHT-TO-MODERATE CHOP. EXAMINATION OF THE AIRPLANE REVEALED OVERTRAVEL OF THE ELEVATORS AND AILERONS. NO OTHER STRUCTURAL DAMAGE WAS FOUND. THE AILERONS AND AILERON TRIM TAB WERE OUT OF ADJUSTMENT.

Probable Cause: a loss of control and upset due to an inadequate adjustment of the ailerons and aileron trim tab by company maintenance personnel that resulted in a partial failure of the right horizontal stabilizer.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001211X13166&key=1

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
04-Nov-2018 08:43 ASN Update Bot Added

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