AD NUMBER: 2009-05-05
MANUFACTURER: Primary Flight Displays
SUBJECT: Airworthiness Directive 2009-05-05 SUMMARY: We are adopting a
new airworthiness directive (AD) to supersede AD 2008-06-28 R1,
which applies to certain Avidyne Corporation (Avidyne) Primary
Flight Displays (PFDs) (part numbers(P/Ns) 700-00006-000, -001,
-002, -003, and -100) that are installed on airplanes. AD
2008-06-28R1 currently requires you to do a check of the
maintenance records and inspection of the PFD (if necessary) to
determine if an affected serial number PFD is installed and
incorporate (if necessary) operational limitations. Since we issued
AD 2008-06-28 R1, Avidyne developed a factory modification that
will correct the problems on these Avidyne PFDs and also factory
modified certain serial number PFDs. To terminate the operational
limitations of AD 2008-06-28R1, this AD adds actions to assure any
affected serial number PFD complies with one of the following:
Passes the air data system performance verification test, receives
the factory modification, or is replaced with a PFD that has
complied with one of the previous two conditions or is not one of
the affected serial number PFDs. Consequently, this AD will retain
the actions from the previous AD until the added terminating action
has been complied with. We are issuing this AD to prevent certain
conditions from existing when PFDs display incorrect attitude,
altitude,and airspeed information. This could result in
airspeed/altitude mismanagement or spatial disorientation of the
pilot with consequent loss of airplane control, inadequate traffic
separation,or controlled flight into terrain
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