# SDR CALA2026032014714

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 18, 2026
- Submitted: March 20, 2026
- Operation: Air carrier
- Aircraft: [N851UA](https://openairdocs.org/aircraft/N851UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 1664
- Aircraft time: 72,560 hours, 32,710 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: Seal
- Part number: NSA80543208
- Condition: Worn
- Location: Lt Wing
- 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/CALA2026032014714

## Discrepancy

AIR BLEED MSG - DUE TO HISTORY OF AIR BLEED MSG, AVIATAR IS SHOWING L WING LOOP A 36-22-16 DURING CRUISE FLT DO THE FAULT ISOLATION PER TSM 36-22-00-810-825-A TO CHK L-WING LOOP A FOR DISCREPANCIES. VERIFY NO BLEED LEAKS ARE PRESENT. CHK LOOP RESISTANCE AND IMPEDANCE READINGS ARE WITHIN LIMITS. THE CWR SHOULD BE 15-25 OHMS REF AMM 36-22-00-760-803-A. LOOP IMPEDA NCE SHOULD BE >10K OHMS AMM 36-22-00-760-804-A. CORRECT DISCREPA NCIES FOUND. REPORT ALL FINDINGS, SFOLM LEE 650-874-5101.CARRIED BY ELB PER TSM TASK 36-22-00-810-825-A. BMC 1 BITE TEST OK, WILL NEED TO OPEN ACCESS PANELS TO PERFORM DUCT LK INSPECTION REF AMM 36-11-00-720-809. PROFORMED LEAK CHECK FOUND LEAK AT DUCT NR 2 & 28 CONNATION IAW AMM 30-11-42.  ALSO REMOVE ANTI-ICE VALVE AND DUCT NR 2 TO INSPECT FOR DAMAGE AND WEAR. REPLACED WORN SEALS INSIDE DUCTS 2, 28, AND 78 IAW AMM 30-11-42/401 CONFIG 00 ILLUSTRATIONS. TORQUED CLAMP 44 INSULATION SLEEVE STILL NEEDS TO BE INSTALLED OVER CLAMP ALL WORK REF AMM 30-11-42. TESTED OVER HEAT LOOPS FROM BMC 1 FOR LEFT WING, CHANNEL A, NO FAULTS FOUND REF TSM 36-22-00-810-807-A AND WDM 36-22-01. REINSTALLED DUCT #2 IAW TASK 30-11-42-400-001-A UP TO AND INCLUDING PARA 4 STEP 13. ANTI ICE CONTROL VALL CBS HAVE BEEN CLOSED AND OPPS CHECKS AND LEAK CHECK GOOD REF AMM TASK 30-11-42-400-001-A PARAGRAPH C TO  AND THUR SUBTASK 30-11-42-410-050-A PARAGRAPH A COMPLETED.

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