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Wed, May 02, 2007

AD: MD Helicopters

AD NUMBER: PL2007-09-51
MANUFACTURER: MDHI
SUBJECT: Airworthiness Directive PL2007-09-51
SUMMARY: This Emergency Airworthiness Directive (AD) is prompted by a report of an accident after the loss of a tail rotor blade. This condition, if not corrected, could result in the failure of a tail rotor blade and subsequent loss of control of the helicopter.

The FAA has reviewed MD Helicopters ServiceBulletin No. SB369H-247, SB369D-204, SB369E-099, and SB369F-084, dated April 26, 2007 (SB), which describes procedures for inspecting the tail rotor blade assembly. The SB states that reports from the field have shown that there are tail rotor blades in operation with a machining defect.

The SB further states that these blades have a sharp transition in the tapered end of the root fitting bore that can cause the tail rotor blade root fitting to fail.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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