# SDR AU990420021

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 5, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Boeing 747*
- Engine: Pwa JT9D7AH
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Spacer
- Part number: 712360
- Condition: Unapproved Part
- Location: Compressor
- Component: Pwa, JT9D7AH
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU990420021

## Discrepancy

(AU) DURING INSPECTION A SPACER SUSPECTED OF BEING AN UNAPPROVED PART, WAS FOUND ON A JT9D ENGINE BELLCRANK.  THE ENGINE HAD BEEN INDUCTED INTO THE SHOP FOR REFURBISHMENT.  THIS PART IS CRITICAL TO ENGINE OPERATION BECAUSE IT IS HOLDING A ROD ATTACHED TO THE INLET GUIDE VANES.  FAILURE OF THIS PART COULD CAUSE A SURGE WHICH COULD RESULT IN AN ENGINE IN-FLIGHT SHUTDOWN.  THE SUSPECTED PART HAD FAILED A HARDNESS PER THE MAINTENANCE MANUAL.

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