NOTAR

April 16, 2007 - 7:02am

MD Helicopters completed a restructuring last month in which Patriarch Partners, a New York financial firm, acquired a controlling interest in the Mesa, Ariz. helicopter manufacturer. RDM, a Netherlands-based group that purchased the company from Boeing in 1999, retains a minority interest.

December 19, 2006 - 3:51am

Charles Vehlow, newly appointed president of MD Helicopters, hopes to become the strong link in a broken supply chain that has plagued the Mesa, Ariz.-based manufacturer.

November 22, 2006 - 6:50am

The NTSB has asked the FAA to require MD Helicopters to conduct tests to “enable the full analysis” of all critical loads for tension-torsion (T-T) straps installed in the notar anti-torque fan of MD 500N, 600N and 900 rotorcraft. The recommendations stem from the Safety Board’s ongoing investigations into two nonfatal accidents involving MD 900s in 2004.

October 16, 2006 - 9:11am

Bell says its new anti-torque system will offer directional control, reductions in main rotor speed and noise and higher cruise speeds–up to 170 knots. Bell will evaluate the Propulsive Anti-Torque System (PATS) next year using a full-size gas turbine engine, inlet fan, bifurcated ducting and a series of test thrusters.

September 18, 2006 - 10:16am

The NTSB has asked the FAA to require MD Helicopters to conduct tests to “enable the full analysis” of all critical loads for tension-torsion (T-T) straps installed in the Notar anti-torque fan of MD 500Ns, 600Ns and 900s. The recommendations stem from the Safety Board’s ongoing investigations into two nonfatal accidents involving MD 900s in 2004.

September 15, 2006 - 11:19am

MD Helicopters MD 900, Mesa, Ariz., Sept. 8, 2004–The NTSB attributes the accident during the test flight to the fracture of a tension-torsion strap in the fan because of progressive fiber failure of the composite material from compression and/or transverse shear stresses with repeated manipulation of the antitorque control pedals without the fan operating at full rpm.

 
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