AIN Staff

<p>The FAA has adopted and/or proposed a series of Airworthiness Directives (ADs) that will affect operators of Honeywell ALF502/507 and TFE731 engines and Sundstrand APUs. ALF502L-2 and L-2C engine compressor discs may have had too much disc balance material removed, which could cause premature fracturing of the disc. The FAA has already issued this AD as a final rule (<a href="http://edocket.access.gpo.gov/2009/E9-8264.htm" target="_blank">AD2009-08-07</a>) effective May 18. ALF502/507s would be subject to a <a href="http://edocket.access.gpo.gov/2009/E9-8308.htm" target="_blank">proposed AD</a> offering replacement of affected cracked fuel manifolds as a terminating action to replace repetitive inspection intervals. Honeywell TFE731 turbofans with certain low-pressure compressor rotor discs may be subject to an AD. The <a href="http://edocket.access.gpo.gov/2009/E9-8309.htm" target="_blank">proposed AD</a> stems from reports of cracked disc bores, “which could result in an uncontained failure.” Sundstrand Power Systems T62T-46C12 APUs would require updated Fadec software under a <a href="http://edocket.access.gpo.gov/2009/E9-8311.htm" target="_blank">proposed AD</a> resulting from two APU-compartment explosions. These occurred during the start sequence and were caused by over-fueling of the APU at low rpm. Comments on all three proposed ADs are due by June 12. </p>


ADs Seek To Tame Engine, APU Problems

The FAA has adopted and/or proposed a series of Airworthiness Directives (ADs) that will affect operators of Honeywell ALF502/507 and TFE731 engines and Su

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