SDR DSC4331DL6292

Service difficulty report · Retainer Seal

Difficulty date: January 10, 2008
Submitted: January 11, 2008
Operation: General aviation
Engine: Garrtt TPE33110R
Engine time: 18,889 hours, 20,903 cycles
System (JASC): 7210 · Turbine Engine Reduction Gear
Part: Retainer Seal
Part number: 31022811
Condition: Cracked
Location: Engine
Stage of operation: IN
How discovered: C
Nature of condition: L
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

NO GEARCASE NEGATIVE PRESSURE INDICATED DURING ENGINE TEST STAND FUNCTIONAL TESTING. TROUBLESHOOTING FOUND CRACKS IN SEAL RETAINER. SUBJECT RETAINER IS MADE WITH ALUMINUM. OLDER PN 693905-10 IS MADE WITH STEEL. SB 72-0224 AUTHORIZED INSTALLATION OF ALUMINUM RETAINER.