Individually Owned: 150,657
Corporate Owned: 137,281
Marshall County Airport
Aircraft Accident/Incident Report
Lacon, Illinois 61540
Monday, June 18, 2012 10:45 CDT
NTSB Narrative Summary Released at Completion of Accident
The pilot reported that he was flying the airplane at 4,500 feet mean sea level with 23 inches of manifold pressure and with the engine at 2,350 to 2,400 rpm when the airplane began to abnormally vibrate. He scanned the instruments and observed no other abnormal indications. He executed an emergency landing to an airport without incident. The examination of the airplane revealed that about 6 inches of a propeller blade tip had separated from the propeller. The metallurgical examination of the fracture surface revealed that a fatigue crack had originated about 0.06 inch from the blade’s leading edge. A surface gouge was found at the origin of the fatigue crack, which indicated that the direction of the damage was from the leading to trailing edge consistent with foreign object impact to a rotating propeller. A test of the airplane’s tachometer revealed that it was indicating 50 rpm higher than the actual propeller rpm and that it had a restricted propeller operating range from 2,100 to 2,350 rpm. When the pilot set the propeller to 2,350 or 2,400 rpm using the airplane’s tachometer, the actual rpm would have been operating within the restricted rpm range.
NTSB Probable Cause Narrative
The propeller blade’s failure due to a fatigue crack that originated from a surface gouge that resulted from foreign object damage to the propeller blade that occurred at an unknown time.
Event Information
| Type of Event | Incident |
| Event Date | 6/18/2012 |
| Event Day of the Week | Monday |
| Time of Event | 1045 |
| Event Time Zone | Central Daylight Time |
| Event City | Lacon |
| Event State | ILLINOIS |
| Event Country | -- |
| Zipcode of the event site | 61540 |
| Event Date Year | 2012 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 410108N |
| Event Location Longitude | 0892309W |
| Event Location Airport | Marshall County Airport |
| Event Location Nearest Airport ID | C75 |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | -- |
| Airport Elevation | 568 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1056 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | 144 |
| Weather Observation Facility ID | BMI |
| Elevation of weather observation facility | 871 |
| Distance of event from weather observation facility (units?) | 38 |
| Time Zone of the weather observation | CDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | Clear |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 28 |
| Dew Point at event time (in degress fahrenheit) | 21 |
| Wind Direction (degrees magnetic) | 210 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 17 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | -- |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 29.83 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | KBMI 181556Z 21017KT 10SM CLR 28/21 A2983 RMK AO2 |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 32824 |
| NTSB Notification Source | FAA-Springfield FSDO |
| NTSB Notification Date | -- |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Jun 16 2014 5:16PM |
| User who most recently changed record | silj |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N4350T |
| NTSB Number | CEN12IA377 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | -- |
| Damage | Minor |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | PIPER |
| Aircraft Model | PA-28R-200 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 28R-7235014 |
| Certified Max Gross Weight | 2650 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 4 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Feb 5 2012 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 5697 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | MARSHALL COUNTY FLYING CLUB INC |
| Aircraft Owner Street Address | PO BOX 38 |
| Aircraft Owner City | LACON |
| Aircraft Owner State | IL |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 61540-0038 |
| Operator is an individual? | No |
| Operator Name | MARSHALL COUNTY FLYING CLUB INC |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | PO BOX 38 |
| Operator City | LACON |
| Operator State | IL |
| Operator Country | USA |
| Operator Zip code | 61540-0038 |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | Personal |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | C75 |
| Departure City | Lacon |
| Departure State | IL |
| Departure Country | USA |
| Departure Time | 1008 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | C75 |
| Destination City | Lacon |
| Destination State | IL |
| Destination Country | USA |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jun 17 2014 1:19PM |
| User who most recently changed record | silj |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 31 |
| Runway Length | 3200 |
| Runway Width | 75 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |