Document ID: chunk:federal_register_of_legislation:F2008L02601:body:0:p2
Version: federal_register_of_legislation:F2008L02601
Segment Type: other
Provision Reference: 
Character Range: 4064–6662

in accordance with the original issue of this Directive, field-load the TAWS/RMI with updated software having revision 3.07 (for units having serial numbers (S/N) under 2000) or revision A3.06 (for units having S/Ns 2000 and subsequent) in accordance with Sandel ST3400 Service Bulletin SB3400-01, Revision B.
              Revisions of software later than revision 3.07 or A3.06, as applicable, are considered acceptable for compliance with this Requirement.
              The placard and AFM limitations revision installed as required by Requirements 1 and 2 of this Directive may be removed after the software upgrade has been accomplished.
                 4. ST3400 TAWS/RMI units, unless it has been modified in accordance with Sandel ST3400 Service Bulletin SB3400-01, Revision B, may not be installed on any aeroplane either as an initial installation or a replacement spare.
              Later revisions of the above SB, approved by the FAA as an Alternate Method of Compliance (AMOC) to FAA AD 2006-16-18, are considered acceptable for compliance with the equivalent Requirements of this Directive.
              Note 2:  FAA AD 2006-16-18 R1 Amdt 39-15557 refers.
Compliance:   For Requirements 1 and 2 - Within 14 days after the effective date of this Amendment.
              For Requirement 3 - Within 90 days after the effective date of this Amendment.
              For Requirement 4 - Remains unchanged as 'As of 25 December 2006 (the effective date of the original issue of this Directive)'.
              This Amendment becomes effective on 31 July 2008.

Background:  The United States Federal Aviation Administration (FAA) has received a report that an in-flight bearing error occurred in a Model ST3400 TAWS/RMI unit configured to receive bearing information from a very high frequency omnidirectional range (VOR) receiver interface via a composite video signal.  Investigation determined that the error was due to a combination of input signal fault and software error.
             The original issue of this Directive was issued to prevent a bearing error, which could lead to an aeroplane departing from its scheduled flight path, which could in turn result in a reduction in separation from, and a possible collision with, other aircraft or terrain.
             This Amendment continues the requirements of the original issue of this Directive but allows later revisions of software to be installed.
             The original issue of this Directive became effective on 25 September 2006.

James Coyne
Delegate of the Civil Aviation Safety Authority

20 June 2008