# SDR CALA2019092301626

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 2019
- Submitted: September 23, 2019
- Operation: Air carrier
- Aircraft: [N77535](https://openairdocs.org/aircraft/N77535), registered now
- Make and model: Boeing 737824
- Aircraft serial: 62751
- Aircraft time: 11,183 hours, 3,971 cycles
- System (JASC): [3445 · Air Collision Avoidance System](https://openairdocs.org/jasc/3445)
- Part: Computer
- Part number: 8222911002
- Condition: Inoperative
- Location: Tcas
- Stage of operation: UK
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2019092301626

## Discrepancy

TCAS FAIL FLAG ON NAVIGATION DISPLAY SHOWS WITH ATC TRANSPONDER SELECTOR AT TA AND SHOWS WITH SELECTOR AT TA/RA FLAG DISPLAYED IN POSITION 1 AND POSITION 2 REPLACED TCAS COMPUTER OPS OK. PARTS UPDATE. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1079731  SN OFF 2483 COMPUTER, TRAFF OFF 23-3445-9-9001 2483 ON 23-3445-9-9001 0824.

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