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Tue, Nov 08, 2016

AD: Saab AB, Saab Aeronautics Airplanes

AD NUMBER: 2016-22-15

PRODUCT: Certain Saab AB, Saab Aeronautics Model 340A (SAAB/SF340A) and SAAB 340B airplanes.

ACTION: Final Rule

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2012-24-06 for the aircraft listed above.

AD 2012-24-06 required replacing the stall warning computer (SWC) with a new SWC that provides an artificial stall warning in icing conditions, and modifying the airplane for the replacement of the SWC.

This new AD adds airplanes to the applicability, and adds requirements to replace the existing SWCs with new, improved SWCs, and to modify the airplane for the new replacement of the SWC.

This new AD also reduces the compliance time for replacing the SWCs. This AD was prompted by a determination that airplanes with certain modifications were excluded from the applicability in AD 2012-24-06, and are affected by the identified unsafe condition; and that the SWC required by AD 2012-24-06 contained erroneous logic.

The FAA is issuing this AD to prevent natural stall events during operation in icing conditions, which could result in loss of control of the airplane.

DATES: This AD is effective December 9, 2016.

FMI: AD

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