# SDR SWAA2019012328819

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 18, 2019
- Submitted: January 23, 2019
- Operation: Air carrier
- Aircraft: [N210WN](https://openairdocs.org/aircraft/N210WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 34162
- Aircraft time: 48,595 hours, 28,667 cycles
- System (JASC): [7321 · Fuel Control/Turbine Engines](https://openairdocs.org/jasc/7321)
- Part: Hmu
- Part number: 442653
- Part serial: BECU4327
- Condition: Faulty
- Location: Nr 2 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2019012328819

## Discrepancy

DIVERSION/DECLARED EMERGENCY, DURING CRUISE DESCENT 40,000 TO 38,000FT. NR 2 ENGINE SURGED 5 TO 6 TIMES. CROSSFEED WAS OPEN & FWD & AFT NR 2 MAIN TANK PUMPS OFF. FUEL IMBALANCE 4300LBS (L) 4000LBS. DURING SURGES NR 1 N1 71% NR 2 N1 56% AND VARYING 51% TO 56% WHEN BOOST PUMPS TURNED ON -SURGING STOPPED.  R&R HYDRO MECHANICAL UNIT PER MT.

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