AD NUMBER: 2019-19-08

PRODUCT: Certain Bombardier, Inc., Model CL-600-2B19 (Regional Jet Series 100 & 440), CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600- 2E25 (Regional Jet Series 1000) airplanes.

ACTION: Final rule

SUMMARY:  This AD was prompted by reports of power control unit (PCU) rod end fractures due to pitting corrosion.

This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new maintenance tasks.

This AD also requires detailed inspections of the elevator PCU rod ends and applicable corrective actions.

This AD also prohibits using certain aircraft maintenance manual tasks.

DATES: This AD is effective December 17, 2019.

COST: The FAA estimates that this AD affects 1,008 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

The FAA has determined that revising the existing maintenance or inspection program takes an average of 90 work-hours per operator, although the FAA recognizes that this number may vary from operator to operator.

In the past, the FAA has estimated that this action takes 1 work-hour per airplane. Since operators incorporate maintenance or inspection program changes for their affected fleet(s), the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate.

Therefore, the FAA estimates the total cost per operator to be $7,650 (90 work-hours x $85 per work-hour).

The FAA has received no definitive data that would enable the agency to provide cost estimates for the on-condition actions specified in this AD.

FMI: AD