Document ID: chunk:federal_register_of_legislation:F2008L04487:body:0:p3
Version: federal_register_of_legislation:F2008L04487
Segment Type: other
Provision Reference: 
Character Range: 5876–6826

within the pitot/AOA system from freezing condensation.  The Directive is issued to detect and correct improperly performing pitot/AOA probe heaters.

             This condition, if not corrected, could result in a blockage within the pitot/AOA system from condensation freezing with consequent incorrect indication of impact air pressure (airspeed/AOA).  This blockage could lead to the stall warning becoming unreliable and the stick pusher, overspeed warning, autopilot, and yaw damper to malfunction.

             The requires the incorporation of information into the Limitations Section of the AFM that will allow operation only under day visual flight rules (VFR) and allow only a VFR flight plan.  The Directive also requires the test the pitot/AOA probes for heater performance and replacement of the pitot/AOA probe if it fails the heater performance test.

James Coyne
Delegate of the Civil Aviation Safety Authority

6 November 2008