AD NUMBER: 2018-19-12

PRODUCT: Certain Bombardier, Inc., Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), Model CL-600-2D15 (Regional Jet Series 705), and Model CL-600-2D24 (Regional Jet Series 900) airplanes.

ACTION: Final Rule.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2015-17-04, which applied to the aircraft listed above.

AD 2015-17-04 required replacement of left and right fixed control rods and lever assemblies of the elevator control system. This AD adds a detailed visual inspection of the key washers and self- locking nuts of the elevator control linkages and corrective actions if necessary.

This AD was prompted by reports of a disconnect between the elevator lever and control rod and a report indicating that certain revisions of the service information were missing instructions for proper installation of certain key washers.

DATES: This AD is effective October 31, 2018.

COST: The FAA estimates that this AD affects 549 airplanes of U.S. registry. The cost of compliance is estimated as follows:

• Replacement of fixed control rods and lever assemblies (retained actions from AD 2015-17-04) - 14 work-hours × $85 per hour = $1,190. Parts cost - $6,712. Total cost per aircraft - $7,902.
• Detailed visual inspection of the key washers and self-locking nuts (new action) - 3 work-hours × $85 per hour = $255 per aircraft.

FMI: AD