AD NUMBER: 2017-14-16

PRODUCT: Certain Bombardier, Inc., Model BD-100-1A10 airplanes.

ACTION: Final Rule; request for comments.

SUMMARY: This AD requires removing the fasteners attaching the machined center fitting to the rear spar frame lower flange splice, inspecting the fasteners and fastener holes for damage, reworking and repairing the fastener holes, as applicable, and replacing the fasteners.

This AD was prompted by a report indicating that certain fasteners attaching the machined rear spar center fitting to the frame were installed with a gap between the fastener head and the structure, or were installed tilted.

This AD is estimated to affect 187 aircraft of U.S. registry. The FAA estimates that it will take about 37 work-hours per product to comply with the basic requirements of this AD and 1 work-hour per product for reporting. The average labor rate is $85 per work-hour. Required parts will cost about $15,150 per product. Based on these figures, we estimate the cost of this AD on U.S. operators to be $3,437,060, or $18,380 per product.

According to the manufacturer, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals. The FAA does not control warranty coverage for affected individuals. As a result, all costs have included in the cost estimate.

DATES: This AD becomes effective August 1, 2017. Comments must be received by August 31, 2017.

FMI: AD