# SDR 9JLA2021080425175

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2021
- Submitted: August 4, 2021
- Operation: Air carrier
- Aircraft: N989BJ
- Make and model: Piagio P180
- Aircraft serial: 1152
- Aircraft time: 3,195 hours, 2,687 cycles
- System (JASC): [6120 · Propeller Controlling System](https://openairdocs.org/jasc/6120)
- Part: Sensor
- Part number: AA213181
- Condition: Defective
- Location: Speed
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2021080425175

## Discrepancy

THE FLIGHT CREW REPORTED THAT PROPELLER SYNC FAULTED, THE CREW ADVISED, WHEN ENGAGED THE LEFT PROP WOULD SPEED-UP 25 TO 30 RPM. THE DISCREPANCY WAS DEFERRED FOR CONTINUED OPERATIONS. THE MAINTENANCE TEAM TROUBLESHOT AND DETERMINED THE LEFT PROP SYNCHRO PHASER PICK UP WAS DEFECTIVE AND WAS REPORT WAS REPLACED WITH A NEW UNIT. OPS CHECKS WERE SATISFACTORY. THE AIRCRAFT WAS RETURNED TO SERVICE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.