N440SF
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.
10 reports on file, 2014-08-24 – 2026-05-10.
Part: GCU — FAILED (ZONE 200) · airframe 9,683 hrs · 26,628 cycles
#1 GENERATOR DISCONNECT LIGHT DISPLAYED ON CAD. CONFIRMED LOSS OF GENERATOR. RESET ATTEMPTS FAILED. ABORTED FLIGHT AS MEL ONLY ALLOWED DAY VFR AND COULD NOT COMPLETE THE PATIENT TRANSFER BEFORE SUNSET.
Part: GCU — FAILED (ZONE 200) · airframe 9,683 hrs · 26,628 cycles
NR 1 GENERATOR DISCONNECT ON THE CAD. RESET ATTEMPTED AND STILL DISCONNECTED. PATIENT FLIGHT ABORTED DUE TO MEL RESTRICTION OF DAY VFR ONLY.
Part: GCU — FAILED (ZONE 200) · airframe 9,683 hrs · 26,628 cycles
NR 1 GENERATOR DISCONNECT ON THE CAD. RESET ATTEMPTED AND STILL DISCONNECTED. PATIENT FLIGHT ABORTED DUE TO MEL RESTRICTION OF DAY VFR ONLY.
Part: GCU — FAILED (ZONE 200) · airframe 9,683 hrs · 26,628 cycles
NR 1 GENERATOR DISCONNECT ON THE CAD. RESET ATTEMPTED AND STILL DISCONNECTED. PATIENT FLIGHT ABORTED DUE TO MEL RESTRICTION OF DAY VFR ONLY.
Part: GCU — FAILED (ZONE 200) · airframe 9,685 hrs · 26,628 cycles
NR 1 GENERATOR DISCONNECT DISPLAYED ON THE CAD. RESET GENERATOR TO NO AVIAL. DUE TO MEL RESTRICTIONS OF DAY VFR ONLY FLIGHT WAS ABORTED.
Part: ENGINE — MAKING METAL (#1) · airframe 7,371 hrs
DURING CRUISE FLIGHT THE #1 ENGINE CHIP LIGHT ILLUMINATED. AFTER 2 ATTEMPTS TO BURN THE LIGHT REMAINED ON. THE ENGINE POWER WAS REDUCED AND PLANNING FOR PRECAUTIONARY LANDING BEGAN. THE ENGINE WAS THEN SHUT DOWN AND A RUN-ON LANDING WAS PERFORMED WITH NO FURTHER INCIDENTS. THE CHIP PLUG WAS INSPECTED REF MM AND TECH SUPPORT. PLUGS CLEANED AND GROUND RUNS WERE PERFORMED, THE AIRCRAFT WAS RETURNED TO SERVICE.
Part: INDICATOR — INOPERATIVE (LOW ROTOR) · airframe 4,722 hrs · 13,938 cycles
AIRCRAFT WAS PULLED INTO A HOVER AND THE LOW ROTOR WARNING SOUNDED AND THE ROTOR RPM READ ZERO. AIRCRAFT LANDED AND FLIGHT WAS CANCELLED.
Part: WARNING MESSAGE — ILLUMINATED (FUEL PUMP) · airframe 3,665 hrs · 10,717 cycles
DURING CRUISE FLIGHT F PUMP AFT WARNING APPEARED ON THE CAD. ABORTED FLIGHT AND RETURNED TO BASE AT KPIA.
Part: WIRE — BROKEN (NR 1 GENERATOR) · airframe 1,326 hrs · 3,989 cycles
ON FINAL APPROACH, NR 1 GEN DISCONNECT APPEARED ON CAD. AFTER SEVERAL ATTEMPTS TO RESET GENERATOR, IT REMAINED OFFLINE. THE ACFT LANDED AND MAINTENACE WAS CONTACTED. A MECHANIC WENT TO ACFT AND DEFERRED THE DISCREPANCY AND THE ACFT WAS FLOWN TO THE MAIN MAINTENACE FACILITY. THE NEXT DAY A BROKEN WIRE WAS DISCOVERED AT THE NR 1 GENERATOR.
Part: ENGINE — POWER LOSS · airframe 1,089 hrs · 3,235 cycles
BRIEFLY BEFORE ENTERING CRUISE FLIGHT, BOTH ENGINE CAD DISPLAYS SHOWED ENG PA DIS. ALSO ROTOR RPM DROPPED TO THE POINT OF WP LIGHT AND HORN. PILOT LOWERD POWER AND ATTEMPTED TO BEEP UP RPM. LOWERING POWER BROUGHT UP ROTOR RPM. AFTER CONSULTING CHECKLIST FOR WARNINGS, PILOT DECIDED TO ATTEMPT RUNWAY LANDING IN CASE THERE WAS NOT ENOUGH POWER TP HOVER. AT 5 FEET THERE THERE WAS SUFFICIENT POWER AND ROTOR RPM TO HOVER SO PILOT OPTED TO HOVER OVER TO HANGAR TO LAND. ACFT WAS TAKEN OUT OF SERVICE AND MAINTENANCE CONTACTED.