Airworthiness Directives; General Aviation Aircraft Equipped With Certain UPS Aviation Technologies, Inc., Model Apollo SL30 Very-High-Frequency Navigation/Communication (VHF NAV/COMM) Radios

This document publishes in the Federal Register an amendment adopting airworthiness directive (AD) AD 2001-14-51 that was made available previously to all known U.S. owners and operators of General Aviation aircraft equipped with certain UPS Aviation Technologies, Inc., Model Apollo SL30 VHF NAV/COMM radios. This AD requires determination of the version of software being used by the UPS Aviation Technologies, Inc., Model Apollo SL30 VHF NAV/COMM radio, and installation of a placard to prohibit use of the radio's very-high- frequency omnirange (VOR) function for navigation, if necessary. This action is prompted by a report that, during installation of a subject radio, an installer noted that the radio was providing incorrect radial bearing information. The actions specified by this AD are intended to prevent use of incorrect bearing information by the pilot, which could result in inaccurate navigation information.