# SDR CALA2026021013645

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 7, 2026
- Submitted: February 10, 2026
- Operation: Air carrier
- Aircraft: [N77014](https://openairdocs.org/aircraft/N77014), registered now
- Make and model: Boeing 777224
- Aircraft serial: 29862
- Aircraft time: 121,358 hours, 12,380 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Converter
- Condition: Odor
- Location: Zone 100
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026021013645

## Discrepancy

BURNING ODOR,  FL250,  SMOKE ODOR IN ACFT,  VERY FAINT ODOR BRIEFLY THEN DISAPPEARS,  OCASIONALLY REAPPEARS.  IAW MM 05-51-58-800, RAN BOTH PACKS INDIVIDUALLY & TOGETHER WITH BOTH ENGINES & APU,  REMOVED BOTH OZONE CONVERTERS,  INSPECTED INSIDE & REINSTALLED,  CONFIRMED NO BREAKERS OPEN IN E & E, PUT ACFT IN AIR MODE TO RULE OUT SUPPLEMENTAL HEATER FOOT & SHOULDER HEATERS. NO DEFECTS NOTED,  LEAK CHECKED OZONE CONVERTERS.   R & R FOUR LOWER RECIRC FILTERS IN FWD CARGO.  R & R FOUR RECIRCULATION FILTERS IN UPPER CABIN,  RAN LT & R PACK UNITS, LT 10 MINUTES, RT 10 MINUTES & BOTH FOR 10 MINUTES,  THE SLATE ODOR IS STILL PRESENT BUT VERY FAINT. R & R LT OZONE CONVERTER. RAN APU WITH BOTH PACKS ON, THEN RAN PACKS INDIVIDUALLY. NO BURN ODOR.  ACCOMP EXTENDED ENG RUN BOTH LT & RT ENGS, CYCLED PACKS & BLEEDS WITH DIFFERENT TEMP SETTINGS TO INDUCE AN ODOR. SHUTOFF APU ENTIRELY & RAN SYS THE SAME WAY WITH NO ODORS NOTED. R & R RIGHT OZONE CONVERTER,  NO BURN ODOR NOTED IAW LP 7865739 AND 7854182.

---
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.