Individually Owned: 150,657
Corporate Owned: 137,281
St. Cloud Regional Airport
Aircraft Accident/Incident Report
St. Cloud, Minnesota 56301
Tuesady, December 12, 2000 14:00 CST
NTSB Narrative Summary Released at Completion of Accident
The outer 14 inches of one of the propeller blades separated during takeoff at an altitude of 400 to 500 feet above the runway. The certified flight instructor was able to land the airplane on a parallel taxiway without incident. The propeller had 236 hours total time at the time of the incident. Metallurgical examination revealed that about 60 percent of the fracture surface contained features typical of fatigue cracking which emanated from the flat face of the blade arm, near the trailing edge. The examination also revealed the microstructure was normal with the exception that the grain flow pattern followed the surface of the scallop region and not the surface of the blade. Chromium present in the scalloped region of the fracture and not on the fatigued surface indicated that the chromic anodized solution penetrated the indication during the anodizing process prior to the blade being painted.
NTSB Probable Cause Narrative
the fatigue failure of the propeller blade during the initial takeoff climb. The failure was a result of a material defect, which occurred during the manufacturing process and the manufacturers failure to detect the defect.
Event Information
| Type of Event | Incident |
| Event Date | 12/12/2000 |
| Event Day of the Week | Tuesday |
| Time of Event | 1400 |
| Event Time Zone | Central Standard Time |
| Event City | ST. CLOUD |
| Event State | MINNESOTA |
| Event Country | -- |
| Zipcode of the event site | 56301 |
| Event Date Year | 2000 |
| Event Date Month | 12 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | ST. CLOUD REGIONAL |
| Event Location Nearest Airport ID | STC |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 1024 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1353 Central Standard Time |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | STC |
| Elevation of weather observation facility | 1024 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | CST |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Clear |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | -3 |
| Dew Point at event time (in degress fahrenheit) | 0 |
| Wind Direction (degrees magnetic) | 240 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 9 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 30 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 2 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 10452 |
| NTSB Notification Source | FAA |
| NTSB Notification Date | Dec 13 2000 12:00AM |
| NTSB Notification Time | 1300 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Sep 7 2001 7:37AM |
| User who most recently changed record | NTSB\MONR |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N582SP |
| NTSB Number | CHI01IA047 |
| Missing Aircraft Indicator | N |
| 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 | Cessna |
| Aircraft Model | 172S |
| Aircraft Series Identifier | 172S |
| Aircraft Serial Number | 172S8509 |
| Certified Max Gross Weight | 2550 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| 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 | Nov 13 2000 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | -- |
| ELT Installed | Yes |
| ELT Activated | Yes |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | ARKEN AIR, INC. |
| Aircraft Owner Street Address | 305 STONEBROOKE CT. |
| Aircraft Owner City | SHAKOPEE |
| Aircraft Owner State | MN |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 55379 |
| Operator is an individual? | -- |
| Operator Name | MODERN AERO |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 14801 PIONEER TRAIL |
| Operator City | EDEN PRAIRIE |
| Operator State | MN |
| Operator Country | |
| Operator Zip code | 55347 |
| Operator Code | |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| 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) | Instructional |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | Yes |
| Departure Airport Code | STC |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 1400 |
| Departure Time Zone | CST |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Takeoff |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Aug 12 2001 4:00AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 31 |
| Runway Length | 5200 |
| Runway Width | 100 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |