AD NUMBER: 2018-09-15

PRODUCT: Certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes.

ACTION: Final Rule.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2016-25-18, which applied to the aircraft listed above.

AD 2016-25-18 required an inspection for discrepancies of the attachment points of the links between the engine rear mount assemblies, and corrective actions if necessary. This AD requires an inspection of certain attachment points, corrective action if necessary, and replacement of certain bolts and nuts in the engine rear mount assemblies.

This AD also adds airplanes to the applicability. This AD was prompted by the determination that replacement of certain nuts and bolts in the engine rear mount assemblies is necessary.

DATES: This AD is effective June 15, 2018.

COST: The FAA estimates that this AD affects 97 airplanes of U.S. registry.

The actions required by AD 2016-25-18, and retained in this AD take about 1 work-hour per product, at an average labor rate of $85 per work-hour. Based on these figures, the estimated cost of the actions that are required by AD 2016-25-18 is $85 per product.

The retained on-condition costs in this AD take about 2 work-hours per product, at an average labor rate of $85 per work-hour. Required parts cost about $730 per product. Based on these figures, the estimated cost of the on-condition actions that are required by AD 2016-25-18 is $900 per product.

The FAA has received no definitive data that would enable us to provide cost estimates for other retained on-condition actions specified in AD 2016-25-18. It will take about 4 work-hours per product to comply with the basic requirements of this AD. The average labor rate is $85 per work-hour. Required parts will cost up to $14,940 per product. Based on these figures, the estimated cost of this AD on U.S. operators to be up to $1,482,160, or up to $15,280 per product. No definitive data has been received that would enable the FAA to provide cost estimates for the oncondition actions specified in this AD.

FMI: AD