# SDR 95ZZZX2446

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [National Flight Services Inc, repair station DSCR311D](https://openairdocs.org/faa-repair-station/DSCR311D/national-flight-services-inc.md) (OpenAirDocs)
- Engine: Garrtt TPE33112UAR
- System (JASC): [7250 · Turbine Section](https://openairdocs.org/jasc/7250)
- Part: Seal
- Part number: 31038391
- Condition: Cracked
- Location: Turbine
- Part time: 8,568 hours
- Component: 31070852
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX2446

## Discrepancy

DURING INSPECTION FOR COMPRESSOR DAMAGE, FOUND PART CRACKED 11 PLACES.  SB 72-0840 AUTHORIZES INSTALLATION OF PN 3107085-2 TO PROVIDE INCREASED SEAL PLATE TENSION AGAINST FIRST ROTOR ASSY.  THIS PART WAS MODIFIED TO PN 3107085-2 BY INCORPORATING A SHIM BETWEEN THE AIR SEAL AND CURVIC COUPLING (NOTE:  LIFE LIMITED PART LOG IDENTIFICATION WAS NOT UPDATED UPON MODIFICATION).  INCREASED TENSION ON SEAL FLANGE RESULTS IN CRACKING AT FLANGE EDGE.  SUGGEST ALLIED SIGNAL ENGINEERING REVIEW CAUSE/RESULT OF THIS DISCREPANCY.  TIME SINCE MOD:  2130 HOURS, 2132 CYCLES.  NOTE:  THIS IS THE FIFTH ASSEMBLY FOUND CRACKED.  CYCLES:  8915.

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