# SDR UIEA2024020700072

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 7, 2024
- Submitted: February 7, 2024
- Operation: Air carrier
- Aircraft: [N473MC](https://openairdocs.org/aircraft/N473MC), registered now
- Make and model: Boeing 747-45E
- Registry model: [Boeing 747-45E](https://openairdocs.org/model/boeing-747-45e) (OpenAirDocs)
- Aircraft serial: 27174
- Aircraft time: 116,445 hours, 20,984 cycles
- System (JASC): [8012 · Engine Start Valves/Controls](https://openairdocs.org/jasc/8012)
- Part: Start Valve
- Part number: 32911723
- Part serial: 1349C
- Condition: Faulted
- Location: Nr 2
- Stage of operation: TO
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2024020700072

## Discrepancy

ENG 2 LAGGING BEHIND OTHER 3 ON APPLICATION OF TAKEOFF POWER. AIRCRAFT YAWED SLIGHTLY TO THE LEFT, SPEED IN THE 20 TO 30 KNOT RANGE WHEN TAKEOFF REJECTED. #2 START VALVE FOUND NOT CLOSED AND WOULD NOT CLOSE.(<P>START VALVE AND STARTER BOTH REPLACED IAW AMM 80-11-02/401. OPS CHK GOOD.</P>)

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