AD NUMBER: 2018-20-08

PRODUCT: Certain Airbus SAS Model A318, A319, and A320 series airplanes and Model A321-111, -112, -131, -211, -212, -213, -231, and -232 airplanes.

ACTION: Final Rule; request for comments

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2018-02-18, which applied to the aircraft listed above.

AD 2018-02-18 required revising the airplane flight manual (AFM) to provide guidance to the flightcrew for certain emergency procedures.

This new AD requires revising the AFM, and for certain airplanes, removing a certain AFM revision. This AD also adds airplanes to the applicability. This AD was prompted by a determination that, when two angle of attack (AoA) sensors are adversely affected by icing conditions at the same time, data displayed on the back up speed scale (BUSS) could be erroneous.

This AD was also prompted by a determination that the AFM needs to be revised for certain additional airplanes, and that the AFM may have been erroneously revised on certain airplanes not equipped with a BUSS function.

DATES: This AD is effective October 17, 2018. Comments must be received by November 16, 2018.

COST: The FAA estimates that this AD affects 1,250 airplanes of U.S. registry. The cost of compliance is estimated as follows:

• Labor - 1 work-hour × $85 per hour = $85. Cost per aircraft = $85

FMI: AD