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Notice of proposed rulemaking (NPRM).

We propose to supersede Airworthiness Directive (AD) 2014-16- 02, for certain Bombardier, Inc. Model CL-600-1A11 (CL-600) airplanes. AD 2014-16-02 currently requires revising the airplane flight manual to prohibit thrust reverser operation, doing repetitive detailed inspections of both engine thrust reversers for cracks, and modifying the thrust reversers if necessary. The modification of the thrust reversers is also an optional terminating action for the repetitive inspections. Since we issued AD 2014-16-02, we have determined that it is necessary to add a requirement to repair or modify the thrust reversers, which would terminate the requirements of AD 2014-16-02. We are proposing this AD to detect and correct cracks of the translating sleeve at the thrust reverser actuator attachment points, which could result in deployment or dislodgement of an engine thrust reverser in flight and subsequent reduced control of the airplane.

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