Airworthiness Directives; Airbus Model A330 Series Airplanes and Model A340-200 and -300 Series Airplanes

الملخص

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Model A330 series airplanes and Model A340-200 and - 300 series airplanes. This proposed AD would require revising the airplane flight manual (AFM) to prohibit the flightcrew from performing CAT 2 and CAT 3 automatic landings and roll-outs at certain airports. This AD also provides an optional terminating action for the AFM revision. This proposed AD results from data showing that the magnetic variation table installed in certain Honeywell and Northrop Grumman air data inertial reference units (ADIRUs) is obsolete at certain airports. We are proposing this AD to prevent the airplane from departing the runway during a CAT 2 or CAT 3 automatic landing or roll-out, due to differences between actual magnetic variation and the values in the ADIRU magnetic variation tables.