# SDR UIEA2019111425896

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 12, 2019
- Submitted: November 20, 2019
- Operation: Air carrier
- Aircraft: [N477MC](https://openairdocs.org/aircraft/N477MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29255
- Aircraft time: 85,133 hours, 15,096 cycles
- System (JASC): [7830 · Engine Thrust Reverser](https://openairdocs.org/jasc/7830)
- Part: Pressure Switch
- Part number: 32052215
- Part serial: GRTM5167
- Condition: Failed
- Location: Thrust Reverser
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2019111425896

## Discrepancy

#4 T/R INDICATION AT 70 KNOTS, RTO.(<P>HIGH ENERGY STOP INSPECTION CARRIED OUT, SATISFACTORY PER AMM 05-51-10.</P><P>ITEM M2 - #4 T/R DEACTIVATED IAW DDG 78-31-01A, MDDR 120539 OPENED, CAT 'C'. </P><P>LP 1104030 - M2: REMOVED AND REPLACED #4 ENG THRUST REVERSER DIRECTIONAL PILOT PRESSURE SWITCH VALVE (DPV) IAW AMM 78-34-01, OPS CHECK GOOD. THIS ACTION CLEARS DMI 120539. PLACARDS REMOVED. </P>)

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