# SDR ASAA2022021037416

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2022
- Submitted: February 15, 2022
- Operation: Air carrier
- Aircraft: [N594AS](https://openairdocs.org/aircraft/N594AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35191
- Aircraft time: 49,566 hours, 14,716 cycles
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: 442653
- Part serial: BECW5052
- Condition: Faulty
- Location: #2 Engine
- Part time: 50,406 hours, 16,318 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022021037416

## Discrepancy

#2 ENGINE FAILED TO START. N1 ROSE TO ABOUT 12% AND THEN DECREASED. THE ALERT BOX AROUND EGT GAUGE FLASHED AND WE ABORTED THE START. GROUNDED - YES. PERFORMED B737-800 FIM 80-05 TASK 806 - FOLLOWS FIM FAULT ISOLATED DOWN TO " REPLACE HMU". FUEL PUMP & HMU REPLACED ON W/O 1901043 REF LP 60285718. ALT DEACTIVATIN PROC REVERSED. (5 MIG 51A'S REMOVED).

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