# SDR CALA2026062517341

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 24, 2026
- Submitted: June 25, 2026
- Operation: Air carrier
- Aircraft: [N12221](https://openairdocs.org/aircraft/N12221), registered now
- Make and model: Boeing 737824
- Aircraft serial: 28930
- Aircraft time: 82,242 hours, 30,969 cycles
- System (JASC): [5300 · Fuselage Structure (General)](https://openairdocs.org/jasc/5300)
- Part: Adapter
- Part number: 143A3181U26
- Condition: Damaged
- Location: Tcas Antenna
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026062517341

## Discrepancy

UPPER FUSELAGE STA 385, NR 2 TCAS ANTENNA MOUNTING SURFACE HAS MULTIPLE TOOLING MARKS. REQUIRES EVALUATION.  REMOVED AND REPLACED TCAS ANTENNA ADAPTER AT UPPER FUSELAGE IAW DWG: 143A3180 REV V, PL:143A3180 REV J, SRM 51-40-02-0G -0 STEP 4, 51-40-05--0G-0, AMM 51-21-41-370-802, 51-21-72-370-80 4, AND 51-21-99-300-801.

---
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.