# SDR S04472025

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 20, 2004
- Submitted: April 8, 2004
- Operation: Air carrier
- Make and model: Boeing 747-400
- Registry model: [Boeing 747-400](https://openairdocs.org/model/boeing-747-400) (OpenAirDocs)
- Aircraft serial: 24311
- Engine: Pwa PW4056
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Part serial: 724363
- Condition: Surges
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/S04472025

## Discrepancy

744 B18273, DURING FINAL APPROACH, AT ALT 4000 FT, AUTO THROTTLE WAS ENGAGED. WHEN THROTTLE ADVANCE FROM IDLE, ENG 1 SURGE AND SPOOL DOWN.C/A:  REPLACE ENG 1 VSV ACT. PERFORM MAINT ACTION IAW FIM 71-00-00. CHECK NML.

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