# SDR 99ZZZX1850

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Aero Controls, LLC, repair station IU6R626N](https://openairdocs.org/faa-repair-station/IU6R626N/aero-controls-llc.md) (OpenAirDocs)
- System (JASC): [2752 · Trailing Edge Flap Actuator](https://openairdocs.org/jasc/2752)
- Part: Screw
- Part number: 580867
- Condition: Failed
- Location: Flap Actuator
- Component: Sperryvicrs
- 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/99ZZZX1850

## Discrepancy

SHAFT SEAL RETAINING SCREWS, 6 EACH, WERE FOUND BACKED OUT OF THEIR RESPECTIVE SCREW HOLES IN BEARING SLEEVE PN 79092 CAUSING EXCESSIVE LEAKAGE PAST THE SHAFT SEAL O-RING PN 271202.  THIS HAS BEEN NOTED TO HAVE OCCURRED ON ANOTHER MOTOR ASSY.  STAKE SCREW UPON INSTALLATION OR USE OF LOCKTITE ON SCREW THREADS.  INSTALLING A LONGER SCREW FOR BETTER THREAD ENGAGEMENT OR REPLACE THE SCREW WITH A DIFFERENT TYPE/DESIGN.  COMPONENT P/N MS9391130ZE4C.

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