AD NUMBER: 2017-19-17

PRODUCT: Certain Dassault Aviation Model FALCON 900EX and FALCON 2000EX airplanes.

ACTION: Final Rule.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2016-17-02, which applied to the aircraft listed above.

AD 2016-17-02 required revising the airplane flight manual (AFM) to include procedures to follow when an airplane is operating in icing conditions. AD 2016-17-02 also provided optional actions after which the AFM revision may be removed from the AFM.

Since AD 2016-17-02 was issued, the FAA has determined additional actions are necessary to address the identified unsafe condition.

This new AD retains the requirement of AD 2016-17-02, and also requires a detailed inspection of the wing anti-ice system ducting (anti-ice pipes) for the presence of a diaphragm, and replacement of ducting or reidentification of the ducting part marking.

COST: The FAA estimates this AD affects 52 airplanes of U.S. registry.

The action required by AD 2016-17-02, and retained in this AD, takes 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 action that is required by AD 2016-17-02 is $85 per product.

The FAA also estimates that 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. Based on these figures, the estimated cost of this AD on U.S. operators to be $17,680, or $340 per product. In addition, the agency estimates that any necessary follow-on actions will take about 19 work-hours and require parts costing $24,000, for a cost of $25,615 per product. The FAA has no way of determining the number of aircraft that might need these actions.

DATES: This AD is effective October 27, 2017.

FMI: AD