AD NUMBER: 2006-16-18R1
MANUFACTURER: Terrain Awareness Warning System (TAWS)
SUBJECT: Airworthiness Directive 2006-16-18 R1 SUMMARY: The FAA is
revising an existing airworthiness directive (AD) that applies to
Sandel Avionics Incorporated Model ST3400 TAWS/RMI units as
described above. The existing AD currently requires installing a
warning placard on the TAWS/RMI and revising the Limitations
section of theairplane flight manual (AFM). The existing AD also
requires installing upgraded software in the TAWS/RMI.
This new AD allows installing later revisions of the software
described in the existing AD. This AD results from a report that an
in-flight bearing error occurred in a Model ST3400TAWS/ RMI
configured to receive bearing information from a very high
frequency omnidirectional range (VOR) receiver interface via a
composite video signal, due to a combination of input signal fault
and software error.
We are issuing this AD to prevent a bearing error, which could
lead to an airplane departing from its scheduled flight path, which
could result in a reduction in separationfrom, and a possible
collision with, other aircraft or terrain.