# SDR CALA2021033000399

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2021
- Submitted: March 30, 2021
- Operation: Air carrier
- Aircraft: [N465UA](https://openairdocs.org/aircraft/N465UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 1341
- Aircraft time: 63,119 hours, 26,974 cycles
- System (JASC): [3445 · Air Collision Avoidance System](https://openairdocs.org/jasc/3445)
- Part: Transceiver
- Part number: 6228971322
- Condition: Failed
- Location: Tcas
- Stage of operation: CR
- 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/CALA2021033000399

## Discrepancy

BOTH XPDR SYS FAILED AIR RETURN TO DENDUE TO INTL FLT TCAS FAULT DISPLAYED AT ENGINE START. REF TSM TASKS 34-43-00-810-820 AND 34-43-00-810-821-A, REF LMC LP 6055083 FOR GUIDANCE TO REPLACE TCAS COMPUTER. ACCOMPLISHED BITE TEST OF INSTALLED TCAS COMPUTER IAW AMM 34-43-00-740-001-A. TESTED GOOD. ALSO ACCOMPLISHED BITE TEST & OPERATIONAL TEST OF BOTH ATC ''S SYSTEMS , IAW AMM 34-52-00-740-004-A & AMM 34-52-00-710-003-A. BOTH ATC 1 & 2 TESTED GOOD . TCAS TRANSCEIVER RPL AS PER  LP 6055083

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