# SDR 95ZZZX4607

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 21, 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 Plate
- Part number: 31038939
- Condition: Cracked
- Location: Turb 1st Stage
- Part time: 6,135 hours
- Component: 31033155
- 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/95ZZZX4607

## Discrepancy

DURING INSPECTION/REPAIR FOR LOW POWER, FOUND SEAL PLATE CRACKED.  SB 72-0840 AUTHORIZES INSTALLATION OF THIS PART TO INCREASE SEAL PLATE TENSION AGAINST FIRST STAGE ROTOR ASSEMBLY.  INCREASED TENSION ON THE SEAL FLANGE RESULTS IN CRACKING AT THE EDGE PROPOGATING RADIALLY INWARD.  SUBMITTER SUGGESTS ALLIED SIGNAL ENGINEERING REVIEW CAUSE/EFFECT.  NOTE:  THIS IS A CRITICAL LIFE-LIMITED COMPONENT.  LIMIT IS 20,000 CYCLES.  THIS IS THE 9TH SEAL PLATE FOUND CRACKED.   TOTAL CYCLES, 7,427.

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