# SDR AT9900220

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 17, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N464AT
- Make and model: Boeing 737-2L9
- Registry model: [Boeing 737-2L9](https://openairdocs.org/model/boeing-737-2l9) (OpenAirDocs)
- Aircraft serial: 21278
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: O Ring
- Part number: NAS16126
- Condition: Deteriorated
- Location: Tr Press Switch
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AT9900220

## Discrepancy

JUST AFTER TAKEOFF, HYDRAULIC FLUID LEVEL WENT FROM FULL INDICATION TO ONE GALLON.  AIR RETURN.  REMOVED AND REPLACED FAULTY O-RING AT THRUST REVERSER PRESSURE SWITCH IAW MM 20-10-131.  LEAK CHECK GOOD.

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