AD NUMBER: 2019-17-01

PRODUCT: Certain Learjet, Inc. (Learjet), Model 60 airplanes.

ACTION: Final Rule.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2017-11-09 for the aircraft listed above.

AD 2017-11-09 required a one-time fluorescent dye penetrant inspection of the fuselage skin for corrosion, additional related inspections and corrective actions as necessary, and reporting the inspection results to the FAA.

This AD clarifies the compliance time for the inspection and corrects an error in the inspection area of the fuselage skin.

This AD was prompted by the identification of an error in the fluorescent dye penetrant inspection of the fuselage skin and an ambiguity in the compliance time for the fluorescent dye penetrant inspection.

DATES: This AD is effective October 2, 2019.

COST: The FAA estimates that this AD affects 284 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• Inspection (retained action from AD 2017-11-09): 46 work-hours × $85 per hour = $3,910. Parts: $265. Cost per airplane: $4,175
• Reporting (retained action from AD 2017-11-09): 1 work-hour × $85 per hour = $85 per airplane.

This AD adds no additional economic burden. The FAA has not received definitive data that would enable us to provide cost estimates for the on-condition actions specified in this AD. 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, it has included all known costs in the cost estimate.

FMI: AD