# SDR C2XA01CL211

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2001
- Submitted: October 8, 2001
- Operation: Air carrier
- Aircraft: [N15509](https://openairdocs.org/aircraft/N15509), registered now
- Make and model: Emb EMB-135ER
- Registry model: [EMB EMB-135ER](https://openairdocs.org/model/embraer-emb-135er) (OpenAirDocs)
- Aircraft serial: 145238
- System (JASC): [3452 · ATC Transponder System](https://openairdocs.org/jasc/3452)
- Part: Transponder
- Part number: 7510700726
- Part serial: 99043880
- Condition: Failed
- Location: Cockpit
- Part time: 3,498 hours, 3,259 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/C2XA01CL211

## Discrepancy

CLE FLIGHT NR 3899  CREW REPORTED THAT THE NUMBER 1 TRANSPONDER NO MODE "C". NUMBER 2 TRANSPONDER ALREADY ON MEL.  RETURNED TO CLE AND LANDED WITHOUT INCIDENT.  MAINTENANCE INSPECTED, AND REMOVED AND REPLACED THE NUMBER 1 TRANSPONDER. SYSTEM OPERATIONAL CHECKS GOOD. AIRCRAFT WAS RELEASED 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.