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Mon, Apr 09, 2012

AD: Bombardier Challenger 300

AD NUMBER: 2012-06-03

PRODUCT: All Bombardier, Inc. Model BD-100-1A10 (Challenger 300) airplanes
SUBJECT: Airworthiness Directive 2012-06-03
ACTION: Final Rule

SUMMARY: This AD was prompted by reports that the horizontal stabilizer trim actuator (HSTA) no-back and the number 1 motor brake assembly (MBA) can both fail dormant. This AD requires revising the airplane maintenance schedule to include new functional tests of the HSTA no-back and HSTA brake system.

The FAA is issuing this AD to prevent dormant failure of the HSTA no-back and the number 1 MBA, which along with additional component failure could result in an uncontrollable horizontal stabilizer surface runaway without the ability to retrim, and consequent loss of the airplane.

DATES: This AD becomes effective May 10, 2012.

FMI: AD

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