Two instances of bearing failure in GE CT7-8A turboshaft engines prompted the FAA to issue an emergency AD (2006-06-51) on March 17. The directive requires Sikorsky S-92 operators to inspect the chip detector for debris at intervals of 25 hours. The FAA says aluminum oxide contamination caused the first failure and damage from improper use of a tool caused the bearing to fail in the second case.
S-92 Engine Subject of Emergency AD
- September 20, 2006, 10:02 AM