N240SF
Registered owner: OSF AVIATION LLC, IL (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| OSF AVIATION LLC (O84A) | Certificate holder | — | Matched by certificate designator |
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
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.
12 reports on file, 2015-07-28 – 2026-06-22.
Part: BLOWER MOTOR — BROKEN (ZONE 200) · airframe 9,713 hrs · 26,745 cycles
UNUSUAL NOISE FROM THE PASSENGER BLOWER MOTOR.
Part: BLOWER — FAULTY (ZONE 200) · airframe 9,682 hrs · 26,652 cycles
DURING TAKEOFF IT WAS NOTED AN UNUSUAL NOISE WAS HEARD IN THE CABIN OVERHEAD FOLLOWED BY AN ODOR. ABORTED TAKEOFF AND SHUT DOWN AIRCRAFT.
Part: WIRE — CHAFED (TAIL ROTOR) · airframe 9,235 hrs · 25,440 cycles
PILOT REPORTED TR CHIP CT ON WARNING UNIT DURING STARTUP. FLIGHT WAS THEN ABORTED. MX FOUND A CHAFED WIRE ON THE TAIL SECTION THAT CAUSED CONTINUITY TEST TO FAIL. WIRE WAS REPAIRED AND AIRCRAFT WENT BACK IN SERVICE.
Part: VARTOMS — FAULTED · airframe 9,144 hrs · 25,211 cycles
VARTOMS SYSTEM KICKED INTO MANUAL MODE AS ENGINES COULDN'T HOLD TORQUE MATCHING AT THE SPECIFIC POWER SETTING. SYSTEM WAS TROUBLESHOT AND FOUND TO BE WITHIN ALL PARAMETERS. NO DEFECTS NOTED DURING TEST FLIGHTS.
Part: MOTOR — DISENGAGED (VARTOMS) · airframe 8,620 hrs
ON APPROACH THE VARTOMS SYSTEM DISENGAGED AND TORQUE MATCHING HAD TO BE PERFORMED MANUALLY
Part: ROD END — WORN (UNKNOWN) · airframe 7,882 hrs · 21,934 cycles
VIBRATION FELT IN A HOOVER. FOUND ROD END BEARING WORN ON MAIN ROTOR PITCH LINK.
Part: UNKNOWN — UNKNOWN (UNKNOWN) · airframe 7,838 hrs
PILOT PFD AND ND WENT BLANK WITH AHRS INDICATION. CLEANED CONNECTOR PLUG GOING INTO MODE SELECT PANEL COULD NOT DUPLICATE THE ISSUE.
Part: GAUGE — DEBONDED (ZONE 200) · airframe 7,811 hrs
MAST MOMENT WAS EXCEEDED IN A HOVER. LANDED THE AIRCRAFT WITH NO ISSUES. AFTER TROUBLESHOOTING FOUND THE STRAIN GAUGE IN THE MAST HAD DEBONDED CAUSING A FALSE INDICATION IN THE COCKPIT.
Part: OIL SYSTEM — LEAKING (NR 1 ENGINE)
IN CRUISE FLIGHT #1 ENGINE OIL PRESSURE LIGHT CAME ON ENGINE OIL TEMP STARTED TO RISE FOLLOWED BY DEC4REASING ENGINE TORQUE INDICATION. PILOT SHUTDOWN #1 ENGINE AND PERFORMED A RUNNING LANDING AT KYVS. INVESTIGATION SHOWED LOSS OF OIL IN ENGINE RESERVOIR AND AND BURNT OI AT THE POWER TURBINE WHEEL AT THE BACK OF THE ENGINE. ENGINE WAS REPLACED AND THE SUSPECT ENGINE WILL BE SENT TO THE MANUFACTURER FOR FURTHER INVESTIGATION.
Part: INDICATOR — INOPERATIVE (ROTOR RPM) · airframe 4,591 hrs · 14,211 cycles
AIRCRAFT WAS HOVERING WHEN PILOT NOTICED THERE WAS NO ROTOR RPM INDICATION WITH NO WARNING INDICATION AIRCRAFT WAS LANDED AND FLIGHT WAS ABORTED.
Part: CHIP DETECTOR — CONTAMINATED (MR GEARBOX) · airframe 3,836 hrs · 11,298 cycles
M/R GEARBOX CHIP LIGHT ILLUMINATED DURING HOVER. MECHANIC INSPECTED CHIP PLUGS AND FOUND NORMAL FUZZ PER MM. CLEANED CHIP PLUGS AND PERFORMED 10 MINUTE HOVER CHECK AND FOUND NO DEBRIS ON CHIP PLUGS. RETURNED AIRCRAFT TO SERVICE.
Part: WARNING LIGHT — FALSE ACTIVATION (COCKPIT) · airframe 1,795 hrs · 5,277 cycles
TAIL ROTOR GEARBOX CHIP LIGHT OCCURRED OVER AIRPORT, MADE PRECAUTIONARY LANDING. FINISHED PATIENT TRANSPORT BY GND AMBULANCE.