Document ID: chunk:federal_register_of_legislation:F2006B06537:body:0:p2
Version: federal_register_of_legislation:F2006B06537
Segment Type: other
Provision Reference: 
Character Range: 3999–5476

GPS navigation unit by accomplishing all of the actions specified in paragraphs 3.B. and 3.C. of Service Bulletin (SB) 561-4002-001, dated 19 April 2002.

              2. Reidentify the modified Apollo GX50/55/60/65 TSO-C129a GPS navigation unit, according to paragraph 3.D. of SB 561-4002-001.

            Note 2: FAA AD 2004-13-20 Amdt 39-13702 refers.

 Compliance: For Requirement 1 - Within six months after the effective date of this Directive.

            For Requirement 2 - Immediately following completion of Requirement 1. This Airworthiness Directive becomes effective on 2 September 2004.
            Background: The United States Federal Aviation Administration (FAA) has advised that, under certain conditions, Garmin AT, Apollo GX series GPS navigation units with software versions 3.0 to 3.4 may provide erroneous cross-deviation information, which could result in the aircraft deviating from its intended course for a brief period of time. This erroneous information may place an excessive workload on the flightcrew while they monitor other available navigation data to avoid deviating off course.

            To prevent the GPS unit from providing erroneous information, this Directive requires modification and testing of the software for the GPS navigation units.

 Bernard Malcolm Hole
 Delegate of the Civil Aviation Safety Authority 20 July 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 11 August 2004.