Loss of control Accident Beechcraft A100 King Air N15L,

ASN Wikibase Occurrence # 321105

Date:	Wednesday 15 June 2011
Time:	14:05
Type:	Beechcraft A100 King Air
Owner/operator:	Dynamic Avlease
Registration:	N15L
MSN:	B-212
Year of manufacture:	1974
Total airframe hrs:	16170 hours
Engine model:	Pratt & Whitney Canada PT6A-34
Fatalities:	Fatalities: 0 / Occupants: 2
Aircraft damage:	Substantial, written off
Category:	Accident
Location:	near Gray, TN - United States of America
Phase:	En route
Nature:	Ferry/positioning
Departure airport:	Bridgewater Air Park, VA (KVBW)
Destination airport:	Wichita-Mid-Continent Airport, KS (ICT/KICT)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
A Beechcraft A100, N15L, operated by Dynamic Avlease Inc., was substantially damaged when it experienced an in-flight upset, while in cruise flight near Gray, Tennessee. The two certificated commercial pilots were not injured. Instrument meteorological conditions (IMC) prevailed and an instrument flight rules flight plan had been filed for the flight that departed Bridgewater Air Park, VA, destined for Wichita-Mid-Continent Airport, KS (ICT).
According to the flight crew, the airplane was flying in smooth IMC conditions at FL200, with an area of "moderate to heavy to extreme" precipitation located about 30 miles to the northwest. As the airplane approached 20 miles from the weather, it began to experience moderate turbulence and rime ice on the windscreen. The pilot flying deviated course 40-degrees to the south. Turbulence increased further for about 10 seconds, and the airplane then entered an uncommanded left roll and dive. The autopilot disengaged and the pilot's electrically driven attitude indicator tumbled. The flight crew reduced the engine power levers to idle and were able to recover utilizing the copilot's vacuum driven attitude indicator. The airplane was returned to straight and level flight at an altitude of 8,000 feet; however, flight control instability persisted. The flight crew subsequently diverted to Tri-Cities Regional Airport (TRI), Blountville, Tennessee, where the airplane landed without further incident.

Subsequent examination of the airplane by a Federal Aviation Administration (FAA) inspector revealed that the outboard one-third of the left elevator separated in flight, and the outboard right elevator was deformed downward. In addition, the horizontal stabilizer bulkhead frame was fractured and the aft portion of the airframe sustained several areas of deformation.

PROBABLE CAUSE: "An encounter with convectively-induced turbulence and icing, which resulted in an in-flight upset and a loss of airplane control."

Accident investigation: