# SDR ASAA2016053116881

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2016
- Submitted: May 31, 2016
- Operation: Air carrier
- Aircraft: [N585AS](https://openairdocs.org/aircraft/N585AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35683
- Aircraft time: 33,340 hours, 9,990 cycles
- Engine: Cfmint CFM567B27B3
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: 442597
- Part serial: BECW4939
- Condition: Failed
- Location: Nr 1 Engine
- Part time: 31,536 hours, 10,475 cycles
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016053116881

## Discrepancy

WHILE ACCOMPLISHING TASK CARD 78273000, NR 1 ENGINE HAS FAULT 73-31161, MECHANICAL OVERSPEED PROTECTION SIGNAL IS OUT OF RANGE,  FAULT IS A LONG TIME FAULT. ACFT GROUNDED.  ACCOMPLISHED HMU REMOVAL REF T/C N8473000,  ACCOMPLISHED HMU INSTALL AT  NR 1 ENGINE, REF N8473001. LEAK/OPS CHECK OK.

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