N840TW
Registered owner: NEPTUNE AVIATION SERVICES INC, MT (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| CLEARWATER AIR INC (LAMA) | Certificate holder | — | Matched by certificate designator |
| NorCal Aero, LLC. (CFKA) | Certificate holder | — | Matched by certificate designator |
| TRANS WORLD AIRLINES | Operator | on 1979-04-04 | Operator named in NTSB report |
Accident & incident history
Operated by TRANS WORLD AIRLINES INC (per NTSB report)
Maintenance disclosures
Service Difficulty Reports filed with the FAA for this airframe. Filing is largely voluntary — the number of reports is not a measure of reliability. To verify a report, search its control number at the FAA SDRS site.
1 report on file, 2026-06-18.
Part: REGULATOR VALVE — STUCK (RT ENGINE) · airframe 13,872 hrs · 9,391 cycles
DURING FLT, SMOKE IN CABIN, DURING SLOW CRUISE FLT OVER FIRE TRAFFIC AREA, PERFORMED QRH ITEMS, REMOVED SMOKE FROM CABIN. DEPARTED THE FTA TO KCDC LANDED WITHOUT FURTHER PROBLEMS. MX TROUBLESHOT SMOKE IN CABIN TO BE COMING FROM RT ENG. AFTER EXTENSIVE TROUBLESHOOTING OF R/H ENGINE AND AIR CONDITIONING SYSTEM AND COMPONENTS. FOUND REGULATING VALVE NEXT TO ENVIRONMENTAL CONTROL UNIT (ECU) STUCK IN OPEN POSITION. THIS CONDITION ALLOWED FOR UNRESTRICTED P3 AIR TO OVERHEAT ECU AND BURN OFF OIL CAUSING SMOKE AND HIGH DUCT TEMPS.