# SDR R3WA 22.02

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2022
- Submitted: May 2, 2022
- Operation: Air carrier
- Aircraft: [N676TX](https://openairdocs.org/aircraft/N676TX), registered now
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605367
- Aircraft time: 13,449 hours, 10,636 cycles
- System (JASC): [3410 · Flight Environment Data](https://openairdocs.org/jasc/3410)
- Part: Data Box
- Part number: 7014700914
- Part serial: 02076458
- Condition: Dirty
- Location: Zone 100
- Stage of operation: DE
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/R3WA%2022.02

## Discrepancy

CREW WAS DESCENDING TO KMDW WHEN ADC #2 ALTITUDE TAPE FAILED ON FO SCREEN. CREW DECLARED AN EMERGENCY AS THEY WERE APPROACHING CLASS B AIRSPACE. CREW RAN CHECKLIST AND PERFORMED A REVERSION TO THE #1 ADC. LANDED WITHOUT INCIDENT. MAINTENANCE WENT TO AIRCRAFT POWERED UP ALL SYSTEMS AND COULD NOT DUPLICATE AN ERROR. CLEANED ELECTRICAL CONNECTORS.

---
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.