American Eagle Flight 4184 News Reports | 31 October 1994 Roselawn, Indiana

Описание: Air Traffic Control (ATC) Recording:
   • American Eagle Flight 4184 ATC Recording |...  

Accident Description:
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Photos Archive:
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𝗔𝗺𝗲𝗿𝗶𝗰𝗮𝗻 𝗘𝗮𝗴𝗹𝗲 𝗙𝗹𝗶𝗴𝗵𝘁 𝟰𝟭𝟴𝟰 was a scheduled domestic passenger flight from Indianapolis to Chicago, operated by an ATR 72 (Reg. N401AM) on 𝗢𝗰𝘁𝗼𝗯𝗲𝗿 𝟯𝟭, 𝟭𝟵𝟵𝟰.

The plane departed Indianapolis at 14:55. The plane climbed to an enroute altitude of 16,300 feet. At 15:13, the flight began the descent to 10,000 feet. At 15:18, shortly after the plane leveled off at 10,000 feet, the crew received a clearance to enter a holding pattern near the LUCIT intersection and they were told to expect further clearance at 15:45, which was revised to 16:00 at 15:38. At 15:56, the controller contacted the flight and instructed the flight crew to descend to 8,000 feet. At 15:57:33, as the plane was descending through 9,130 feet, the AOA increased through 5°, and the ailerons began deflecting to a right-wing-down position.

About ½ second later, the ailerons rapidly deflected to 13.43° right-wing-down, the autopilot disconnected. The plane rolled rapidly to the right, and the pitch attitude and AOA began to decrease. At 15:57:45 the plane rolled through the wings-level attitude (completion of first full roll). At 15:57:48, as the plane began rolling left, back towards wings level, the airspeed increased through 260 knots, the pitch attitude decreased through 60° nose down, normal acceleration fluctuated between 2.0 and 2.5 G, and the altitude decreased through 6,000 feet. At 15:57:55, the normal acceleration increased to over 3.0 G. At 15:59 the plane impacted a wet soybean field partially inverted, in a nose down, left-wing-low attitude. All 68 occupants were killed.

𝗣𝗿𝗼𝗯𝗮𝗯𝗹𝗲 𝗖𝗮𝘂𝘀𝗲:
"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. Contributing to the accident were 1) the French Directorate General for Civil Aviation's (DGAC's) inadequate oversight of the ATR 42 and 72, and its failure to take the necessary corrective action to ensure continued airworthiness in icing conditions; 2) the DGAC's failure to provide the FAA with timely airworthiness information developed from previous ATR incidents and accidents in icing conditions, 3) the Federal Aviation Administration's (FAA's) failure to ensure that aircraft icing certification requirements, operational requirements for flight into icing conditions, and FAA published aircraft icing information adequately accounted for the hazards that can result from flight in freezing rain, 4) the FAA's inadequate oversight of the ATR 42 and 72 to ensure continued airworthiness in icing conditions; and 5) ATR's inadequate response to the continued occurrence of ATR 42 icing/roll upsets which, in conjunction with information learned about aileron control difficulties during the certification and development of the ATR 42 and 72, should have prompted additional research, and the creation of updated airplane flight manuals, flightcrew operating manuals and training programs related to operation of the ATR 42 and 72 in such icing conditions."

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