Document ID: chunk:federal_register_of_legislation:F2009L01074:body:0:p4
Version: federal_register_of_legislation:F2009L01074
Segment Type: other
Provision Reference: 
Character Range: 8764–12066

of this Directive required a check of the maintenance records and inspection of the PFD (if necessary) to determine if an affected serial number PFD is installed.  If an affected serial number PFD was installed, the Directive required the incorporation of information that limits operation when certain conditions for the PFD or backup instruments exist.  The Directive resulted from the FAA receiving several field reports of PFDs displaying incorrect altitude and airspeed information.
             The Directive was issued 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 aeroplane control, inadequate traffic separation or controlled flight into terrain.
             Amendment 1 corrected a typographical error in the FAA AD number.
             The Amendment introduces a terminating action to the operating limitations introduced by the earlier versions of this Directive.

   The original issue of this Directive became effective on 10 April 2008.

James Coyne
Delegate of the Civil Aviation Safety Authority

10 March 2009

   Appendix - Limitations Regarding Avidyne Primary Flight Displays (PFDs)
   Before conducting flight operations, pilots must review and be familiar with the Crosscheck Monitor section of the Avidyne Primary Flight Display Pilot's Guide and all limitations contained in the aircraft operating handbook.

   As a normal practice, all pilots should be vigilant in conducting proper preflight and in-flight checks of instrument accuracy, including:

          * Preflight check of the accuracy of both the primary and backup altimeter against known airfield elevation and against each other.

          * Verification of airspeed indications consistent with prevailing conditions at startup, during taxi, and prior to takeoff.

          * "Airspeed alive'' check and reasonable indications during takeoff roll.

          * Maintenance of current altimeter setting in both primary and backup altimeters.

          * Cross-check of primary and backup altimeters at each change of altimeter setting and prior to entering instrument meteorological conditions (IMC).

          * Cross-check of primary and backup altimeters and validation against other available data, such as glideslope intercept altitude, prior to conducting any instrument approach.

          * Periodic cross-checks of primary and backup airspeed indicators, preferably in combination with altimeter cross-checks.

   For flight operations under instrument flight rules (IFR) or in conditions in which visual reference to the horizon cannot be reliably maintained (that is IMC, night operations, flight operations over water, in haze or smoke) and the pilot has reasons to suspect that any source (PFD or back-up instruments) of attitude, airspeed, or altitude is not functioning properly, flight under IFR or in these conditions must not be initiated (when condition is determined on the ground) and further flight under IFR or in these conditions is prohibited until equipment is serviced and functioning properly.

   Operation of aircraft not