# SDR A9JA202106160001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2021
- Submitted: June 16, 2021
- Operation: Air carrier
- Make and model: Lear 31
- Registry model: [Lear 31](https://openairdocs.org/model/learjet-31) (OpenAirDocs)
- Aircraft serial: 018
- Aircraft time: 10,294 hours, 10,382 cycles
- System (JASC): [3414 · Airspeed/Mach Indicator](https://openairdocs.org/jasc/3414)
- Part: Indicator
- Part number: 57535900512
- Part serial: 859
- Condition: Erratic
- Location: Airspeed
- Part time: 2,752 hours, 2,923 cycles
- Stage of operation: CR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/A9JA202106160001

## Discrepancy

AIR SPEED INDICATION DRIFTED BETWEEN #1 AND #2 INDICATORS AND CONFUSED PILOTS ON WHAT INDICATION WAS CORRECT. ISSUE ONLY DEVELOPED ABOVE 29,000 FT. INDICATING THE ISSUE IS WITHIN THE MACH AIRSPEED ANEROID.

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