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Difference between revisions of "AT73, en-route, Roselawn IN USA, 1994"

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Loss of Control - Airframe Icing
 
Loss of Control - Airframe Icing

Revision as of 08:22, 21 October 2011

Summary
On 31 October 1994, an ATR 72 operated by Simmons Airlines, crashed near Roselawn, Indiana, USA, following loss of control due to airframe icing.
Event Details
When October 1994
Actual or Potential
Event Type 		Loss of Control, Weather
Day/Night Day
Flight Conditions IMC
Flight Details
Aircraft ATR ATR-72-201
Operator Simmons Airlines
Domicile United States
Type of Flight
Origin Indianapolis International Airport
Intended Destination Chicago/O'Hare International Airport
Take off Commenced Yes
Flight Airborne Yes
Flight Completed No
Flight Phase Descent
ENR / APR
Location En-Route
Origin Indianapolis International Airport
Destination Chicago/O'Hare International Airport
Location
Approx. Roselawn, Newton County, IN
Loading map...


General
Tag(s) Inadequate Airworthiness Procedures
LOC
Tag(s) Airframe Structural Failure,
Environmental Factors,
Extreme Bank,
Extreme Pitch
WX
Tag(s) In Flight Airframe Icing
Safety Net Mitigations
Malfunction of Relevant Safety Net No
GPWS Available but ineffective
Outcome
Damage or injury Yes
Aircraft damage Hull loss
Non-aircraft damage Yes
Fatalities Most or all occupants ()
Causal Factor Group(s)
Group(s) Aircraft Technical
Safety Recommendation(s)
Group(s) Aircraft Operation,
Aircraft Airworthiness,
Air Traffic Management
Investigation Type
Type Independent

Loss of Control - Airframe Icing

Description

On 31 October 1994, an ATR 72 operated by Simmons Airlines, crashed near Roselawn, Indiana, USA, following loss of control due to airframe icing.

Synopsis

This is an extract from the Executive Summary of the official report into the accident published by the National Transportation Safety Board (NTSB) (USA)

“On October 31, 1994, at 1559 Central Standard Time, an Avions de Transport Regional, model 72-212 (ATR 72), registration number N401AM, leased to and operated by Simmons Airlines, Incorporated, and doing business as American Eagle flight 4184, crashed during a rapid descent after an uncommanded roll excursion. The airplane was in a holding pattern and was descending to a newly assigned altitude of 8,000 feet when the initial roll excursion occurred. The airplane was destroyed by impact forces; and the captain, first officer, 2 flight attendants and 64 passengers received fatal injuries. “

The probable cause of the accident was given as:

“The National Transportation Safety Board determines that the probable cause of this accident was the loss of control, attributed to a sudden and unexpected aileron hinge moment reversal, that occurred after a ridge of ice accreted beyond the deice boots while the airplane was in a holding pattern during which it intermittently encountered supercooled cloud and drizzle/rain drops, the size and water content of which exceeded those described in the icing certification envelope. The airplane was susceptible to this loss of control, and the crew was unable to recover.”

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