AD NUMBER: 2019-08-51

PRODUCT: All Cirrus Design Corporation (Cirrus) Model SF50 (Vision Jet) airplanes.

ACTION: Final Rule; request for comments.

SUMMARY: This AD was sent previously as an emergency AD to all known U.S. owners and operators of these airplanes.

This AD requires replacing the angle of attack (AOA) sensors with improved AOA sensors.

This AD was prompted by three incidents on Cirrus Model SF50 airplanes of the stall warning and protection system (SWPS) or Electronic Stability & Protection (ESP) System engaging when not appropriate.

DATES: This AD is effective June 17, 2019 to all persons except those persons to whom it was made immediately effective by Emergency AD 2019-08-51, issued on April 18, 2019, which contained the requirements of this amendment. Comments must be received by August 1, 2019.

COST: The FAA estimates that this AD affects 99 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• Replace the AOA sensor: 1.25 work-hours × $85 per hour = $106.25. Parts: $16,250. Cost per airplane: $16,356.25.

FMI: AD