Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Model A300 B4-600, B4-600R, and F4-600R series airplanes; and C4-605R Variant F airplanes (collectively called A300-600), and Model A310 series airplanes, equipped with certain Honeywell inertial reference units (IRUs). This proposed AD would require revising the Limitations section of the Airplane Flight Manual to prohibit the use of CAT 2 and CAT 3 automatic landing and rollout procedures at certain airports. This proposed AD is prompted by a report that some magnetic deviation tables in the IRU database are obsolete and contain significant differences with the real magnetic deviations. We are proposing this AD to prevent an airplane from deviating from the runway centerline, and possibly departing the runway.