Individually Owned: 150,657
Corporate Owned: 137,281
Council Bluffs Municipal Airport
Aircraft Accident/Incident Report
Council Bluffs, Iowa 51503
Tuesady, September 24, 2002 15:00 CDT
NTSB Narrative Summary Released at Completion of Accident
The helicopter landed hard despite cyclic being applied during an instructional flight in which a certified flight instructor (CFI) and a dual student, seeking a CFI certificate, were performing autorotations. Inspection of the wreckage revealed a fractured cyclic/mixture support attachment bracket. A major portion of the fracture surface contained a very dark discoloration. The discoloration was heavier on the forward side of the fracture, and there were portions of the fracture without discoloration on the aft side of the fracture. Prolonged ultrasonic cleaning in an acetone failed to remove significant amount of this discoloration. The discoloration covered more than 85 percent of the fracture surface. Examination of the fracture surface with a scanning electron microscope after cleaning revealed that the discolored areas had a rounded globular appearance, typical of casting porosity. Features typical of overstress separation were noted in areas without discoloration. The broken arm also contained a secondary crack that extended aft from near the forward edge.
NTSB Probable Cause Narrative
The premature fracture of the cyclic/mixture bracket resulting in the inability to conduct a landing flare.
Event Information
| Type of Event | Accident |
| Event Date | 9/24/2002 |
| Event Day of the Week | Tuesday |
| Time of Event | 1500 |
| Event Time Zone | Central Daylight Time |
| Event City | Council Bluffs |
| Event State | IOWA |
| Event Country | -- |
| Zipcode of the event site | 51503 |
| Event Date Year | 2002 |
| Event Date Month | 9 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 411534N |
| Event Location Longitude | 0954536W |
| Event Location Airport | Council Bluffs Municipal |
| Event Location Nearest Airport ID | CBF |
| 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 | 1253 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1505 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | CBF |
| Elevation of weather observation facility | 1253 |
| Distance of event from weather observation facility (units?) | 0 |
| 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) | 22 |
| Dew Point at event time (in degress fahrenheit) | 5 |
| Wind Direction (degrees magnetic) | 170 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 12 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Gusting |
| Wind Gust (knots) | 21 |
| Altimeter Setting at event time (in. Hg) | 30.16 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| 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 | 2 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 13917 |
| NTSB Notification Source | FAA |
| NTSB Notification Date | Sep 25 2002 12:00AM |
| NTSB Notification Time | 930 |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Sep 30 2003 9:55AM |
| User who most recently changed record | NTSB\MONR |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Des Moines FSDO |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N1040S |
| NTSB Number | CHI02LA293 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | No |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Hughes |
| Aircraft Model | 269A |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 56-0534 |
| Certified Max Gross Weight | 1600 |
| Aircraft Category | Helicopter |
| 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 | 2 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Aug 27 2002 12:00AM |
| Airframe hours since last inspection | 54.5 |
| Airframe Hours | 10383.7 |
| ELT Installed | Unknown |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | Iowa Western Community College |
| Aircraft Owner Street Address | 2700 College Road Box 4-C |
| Aircraft Owner City | Council Bluffs |
| Aircraft Owner State | IA |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 51502 |
| Operator is an individual? | No |
| Operator Name | -- |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | -- |
| Operator Zip code | -- |
| 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) | Instructional |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | CBF |
| Departure City | Council Bluffs |
| Departure State | IA |
| Departure Country | USA |
| Departure Time | 1345 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | CBF |
| Destination City | -- |
| Destination State | -- |
| Destination Country | -- |
| Specific Phase of Flight | Landing - aborted |
| Report sent to ICAO? | No |
| Evacuation occurred | No |
| Date of most recent change to record | Jan 29 2004 1:43PM |
| User who most recently changed record | JOHB |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | -- |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |