A University of North Dakota (UND) Cessna Citation II icing research aircraft made a successful deadstick landing near Beaver, Alaska, about 70 miles north of Fairbanks, after both engines lost power on September 30. In IMC at 9,200 feet, the Citation accumulated about seven-eighths of an inch of ice on the wing’s leading edge.
Mitsubishi MU-2B-36, Pittsfield, Mass., March 25, 2004–The NTSB determined the cause of the accident was “the pilot’s loss of aircraft control for undetermined reasons, which resulted in an inadvertent stall/spin and subsequent impact with the ground.”
Eleven years after the October 1994 crash of American Eagle Flight 4184 in Roselawn, Ind., the FAA proposed a revision to Part 25 certification regulations that aims to prevent such icing accidents. The comment period for the notice of proposed rulemaking (NPRM) closed on February 2. Now the new rules will begin to wend their way through the FAA rulemaking process.
Concerned about the growing number of Cessna 208 Caravan icing accidents, aviation authorities in the U.S. and Canada have issued a bevy of new recommendations, airworthiness directives and restrictions. Caravans continue to be plagued by icing accidents–more than 34 to date– and the number of lawsuits against the manufacturer is mounting.
The FAA last month issued AD 2006-06-06, the result of further icing accidents and incidents involving the Cessna Caravan, flight manual revisions that contain erroneous data and the outcome of recent flight tests. The directive supersedes AD 2005-07-01, issued in March last year. The FAA said that flight manual revisions issued on Dec.
Cessna 208B Caravan, Parks, Ariz., Nov. 8, 2002–The NTSB attributed the Caravan accident to the pilot’s improper in-flight planning/decision making, his flight into known icing conditions and his failure to maintain adequate airspeed. Factors were the pilot’s improper preflight planning/preparation, the icing conditions and an inadvertent stall and spin.
The Falcon 7X flight-test program is progressing on schedule, with four of the trijets logging more than 850 hours during 275 test flights. Certification flights with the EASA have begun and will be completed by year-end, to be followed by final certification and first deliveries early in the new year. As a further mark of progress, Falcon 7X S/N 04 joined the test fleet in late July.
Several Beechjet flameouts have led the NTSB to make recommendations to prevent recurrences. The final recommendation, if adopted, would have wide implications: require the FAA and industry to pursue research to develop an ice detector that would alert pilots to internal engine icing and require that it be installed on new production turbofan engines and retrofitted to existing turbofan engines.
The NTSB wants the FAA to attend immediately to “deficiencies” in the cold-weather operating procedures for Saab 340s, as well as the aircraft’s performance in icing conditions. Specifically, the Board recommends that Saab 340 pilots maintain a minimum operating airspeed of 1.45 Vs before known or forecast icing conditions and during icing encounters.