# SDR 2011F00067

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2011
- Submitted: March 31, 2011
- Operation: Air carrier
- Aircraft: N137SL
- Make and model: Piagio P180
- Aircraft serial: 1102
- Aircraft time: 6,118 hours, 4,542 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- Part: Indication Sys
- Condition: Multiple Fail
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: G
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2011F00067

## Discrepancy

AT FL 350 , BOTH AIRSPEED INDICATORS SLOWLY ROLLED TO ZERO, THE FOLLOWING INSTRUMENTS THEN FAILED: PILOTS ALT, EIFIS MASTER CAUTION (HDG), FLT DIRECTOR , FMS NAV DATA, VIS, COPILOTS ALT FROZE THEN BECAME ERRATIC.  ALT STATIC SOURSE HAD NO EFFECT.  ALL INSTRUMENTS BECAME ERRATIC AFTER 5 MINUTES ABOVE FREEZING.  ALL INSTRUMENTS CAME BACK WHEN NEARING AIRPORT ALTITUDE.

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