# SDR ASAA2020042132656

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 17, 2020
- Submitted: April 21, 2020
- Operation: Air carrier
- Aircraft: [N428AS](https://openairdocs.org/aircraft/N428AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36353
- Aircraft time: 16,484 hours, 5,224 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [7530 · Compressor Bleed Control](https://openairdocs.org/jasc/7530)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: IN
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020042132656

## Discrepancy

DURING ENGINE FAULT CHECK ON FMC CDU ON T/C 78273000, FOUND SHORT TIME FAULT 75-30451 VBV POSITION SIGNAL DISAGREE ON #1 ENGINE. GROUNDED - YES. ON DEFERRAL.

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