According to the Aircraft Electronics Association and the Aircraft Owners and Pilots Association, the Federal Aviation Administrations Advisory Circular (90-100A), released in March, seemed to say that except for specified GPS units, some 26,000 other IFR-approved GPSes were no long eligible to be used in lieu of ADF and DME equipment. That now appears to be a tempest in a teapot. According to a statement by the AEA, the core issue was that wording in the Airmans Information Manual was deleted that specifically allowed the use of IFR- and TSO-approved GPS to substitute for ADF and DME in the IFR system. The FAA has pledged to fix the error and has told the AEA that currently approved IFR GPSes remain viable.
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