# SDR UPS05444912

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 17, 2005
- Submitted: July 18, 2005
- Operation: Air carrier
- Aircraft: [N675UP](https://openairdocs.org/aircraft/N675UP), registered now
- Make and model: Boeing 747123F
- Aircraft serial: 20390
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Indication Sys
- Condition: Malfunctioned
- Location: N2
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: E, J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS05444912

## Discrepancy

NR 3 ENG N2 REACH 112 PERCENT DURING DEPARTURE.  THRUST REVERSE LEVERS IDLE AND N2 WAS 10 PERCENT OR HIGHER THAN OTHER ENGS. NR 3 ENG SHUTDOWN AND RETURNED TO FIELD. DUMPED FUEL AND DECLARED EMERGENCY.  ATB, INTERCHANGED ENG NR 2 AND 3 N2 INDS. ENG GRND RUN UP PERFORMED BY FLT CREW.  AT IDLE PWR ENG NR 2 N2 IND WAS READING APPROX 1.5 PERCENT HIGHER THAN ENG NR 3 WITH AN INCREASE OF RPM. ENG NR 2 INDICATION DIFFERENCE BECAME GREATER 10 PERCENT TLA DIFFERENCE BECAME GREATER. 10 PERCENT TLA DIFFERENCE APPROX 4 PERCENT BOTH N1 MATCHED INDICATION ENG NR 2 HIGHER ENG NR 3 N2 INDS RETURNED TO POS M306224.

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