AD NUMBER: 2018-22-12

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

ACTION: Final Rule.

SUMMARY: This AD was prompted by reports of damage to the protective coating and corrosion on the piston/axle of the main landing gear (MLG), caused by friction between the inboard axle sleeve and the axle thrust face.

This AD requires revising the maintenance or inspection program, as applicable, to incorporate a detailed inspection of the MLG piston/axle for damage to the protective coating and for corrosion.

DATES: This AD is effective December 12, 2018.

COST: The FAA estimates  that this AD affects 530 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD: Revising the maintenance or inspection program takes an average of 90 work-hours per operator, although 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 estimated total cost per operator to be $7,650 (90 work-hours x $85 per work-hour).

FMI: AD