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Wed, Jul 24, 2013

AD: Bombardier, Inc. Airplanes

AD NUMBER: 2013-13-17

PRODUCT: Certain Bombardier, Inc. Model DHC-8-400 series airplanes.
SUBJECT: Airworthiness Directive 2013-13-17
ACTION: Final Rule

SUMMARY: The FAA is superseding airworthiness directive (AD) 2011-13-08 for the product listed above. AD 2011-13-08 required a free-play check for excessive free-play of the shaft swaged bearing installed in the tailstock end of each elevator power control unit (PCU), and replacing any PCU on which the bearing exceeds allowable limits with a serviceable PCU.

This new AD adds airplanes to the applicability from that of AD 2011-13-08. This AD was prompted by a determination that additional airplanes are affected by the identified unsafe condition.

The FAA is issuing this AD to detect and correct excessive free-play of the swaged bearings, which could lead to excessive airframe vibrations and difficulties in pitch control, and consequent loss of controllability of the airplane.

DATES: This AD becomes effective August 26, 2013.

FMI: AD

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