# SDR K4DA2026092401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 20, 2026
- Submitted: September 25, 2026
- Operation: Air carrier
- Aircraft: [N5689T](https://openairdocs.org/aircraft/N5689T), registered now
- Make and model: Gulstm GIV
- Aircraft serial: 1419
- Aircraft time: 10,364 hours, 4,137 cycles
- Engine: Rroyce TAY6118
- Engine time: 10,220 hours, 4,086 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 220470061
- Part serial: 1068
- Condition: Odor
- Location: Zone 100
- Part time: 10,368 hours, 4,140 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K4DA2026092401

## Discrepancy

CREW REPORTED A FAINT HINT OF SMOKE EMANATING FROM THE CABIN AT FL450 ENROUTE FROM KLNK TO KAUS. THEY REPORTED ONLY BEING AT 45,000FT FOR APPROXIMATELY 3 MINS WHEN SMOKE BECAME VISUALLY APPARENT, THEY WERE NOT ABLE TO IDENTIFY THE SMELL OR SOURCE FROM WHICH THE SMOKE ORIGINATED. THE CREW THAN MADE THE DECISION TO DECLARE AND EMERGENCY AND DIVERT TO KICT AS THE NEAREST SUITABLE LANDING AIRPORT. UPON DESCENT THE SMOKE STARTED TO CLEAR AND REMAINED SO IN THE CABIN UPON LANDING. THERE WERE NO CAS MESSAGES, OR ABNORMAL ENGINE OR PRESSURIZATIONS ISSUES / ANOMALIES. THE CREW LANDED THE AIRCRAFT SAFELY AND WITHOUT INCIDENT.

---
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.