AOPA Turbine Pilot Magazine - November 2012 - 90

P&E

WX WATCH

TOTAL AIR TEMPERATURE VERSUS PERCENT OF REPORTS
54% 34%

5% 0° to +7°

–24° to –17° –16° to –9° –8° to –1°

Celsius
Illustration from John P. Dow Sr.’s “Unusual Icing” poll

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corrected for this. Then came another, more violent rolling moment, with the ship rolling back to the right and the angle of attack increasing. The roll rate reached 50 degrees per second, the airplane’s G-load hit plus 3.6 Gs, and airspeed shot up to 375 KIAS as the pilots applied nose-up elevator forces. A total of 68 people were killed by the subsequent impact.
PROBABLE CAUSE. The NTSB determined that the probable cause of the accident was a loss of control caused by an unexpected aileron hinge moment reversal that occurred after a ridge of ice accreted aft of the wing deice boots. This reversal happened because ATR failed to adequately educate pilots about the effects of flying this type of airplane in icing conditions. More blame went to the Direction Générale de L’Aviation Civile (DGAC)—the French counterpart to the FAA—for inadequate oversight of the ATR 72, and its failure to provide the FAA with airworthiness information developed from previous ATR incidents and accidents in icing conditions. It seems that there were several prior icing incidents, known by their locations: the Mosinee, Newark, and Burlington incidents in the United States, and the Ryanair and Air Mauritius incidents overseas. Contributing factors included the FAA’s failure to ensure that flight into known icing (FIKI) certification accounted for flight into freezing rain and “other icing conditions not specified in the Code of Federal Regulations (CFR) Part 25, Appendix C.” In order to earn FIKI certification, an airplane must prove it can fly in the droplet sizes, liquid water contents, and temperatures set out in Appendix C.

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*Not all coverages or products may be available in all jurisdictions. The description of coverage in these pages is for information purposes only. Actual coverages will vary based on local law requirements and the terms and conditions of the policy issued. The information described herein does not amend, or otherwise affect, the terms and conditions of any insurance policy issued by Avemco ® In the event that a policy is inconsistent with the information described herein, the . language of the policy will take precedence. 93% customer retention based on average 2011 monthly renewal data for the Direct Approach Aircraft Insurance Policy. Free hat offer not available in New Mexico. A subsidiary of HCC Insurance Holdings, Inc.
ADS0103 (08/12)

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90 | AOPA PILOT November 2012

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AOPA Turbine Pilot Magazine - November 2012

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