Individually Owned: 150,657
Corporate Owned: 137,281
Atlanta Hartsfield Airport
Aircraft Accident/Incident Report
Atlanta, Georgia 30354
Sunday, June 2, 2002 22:00 EDT
NTSB Narrative Summary Released at Completion of Accident
A Bombardier CL6002B-19, N849AS, operated by Atlantic Southeast Airlines, Inc., as flight 4509, experienced a left main landing gear failure during landing on runway 26R, at the Atlanta Hartsfield International Airport, in Atlanta, Georgia. According to the flight crew, and confirmed by the FDR, the approach to landing was uneventful. Upon landing the pilot deployed the thrust reversers and the left main landing gear collapsed. Fracture of the main fitting for the left main landing gear was caused by a fatigue crack that emanated from multiple origins at the external surface of the wall at the shock strut radius run out area. No evidence of material anomalies, such as corrosion or gouge damage, was found at the fatigue origin area. Because the stresses leading to the fatigue crack of the main fitting have not clearly been identified, the root cause of the fatigue cracking has not been determined. During the investigation, Atlantic Southeast Airlines did a Fleet Wide inspection of all their Bombardier Inc., Model CL600-2B19 aircraft landing gear assemblies, which included visual and eddy current inspections. Their inspections found no additional cracked landing gear. Additionally, Transport Canada issued a revised AD, which eliminated the escalation of the eddy current inspection intervals as allowed in their previous AD. Also, the FAA issued an NPRM in response to Transport Canada AD, which requires repetitive detailed visual and eddy current inspection of the main landing gear main fitting. The NPRM if adopted would produce another AD that is applicable to certain Bombardier Model CL600-2B19 (Regional Jet Series 100 & 440) airplanes. The proposal would require repetitive detailed and eddy current inspections on the main fittings of the main landing gears (MLG) to detect discrepancies, and related investigative/corrective actions if necessary. The proposal also requires servicing of the shock strut of the MLGs; inspection the shock strut of the MLGs for nitrogen pressure, visible chrome dimension, and oil leakage; and servicing any discrepant strut. Transport Canada has also accepted Messier-Dowty’s redesign of the main fitting, on condition that the testing of the new design would be completed successfully. The testing is scheduled to commence in July 2004. Once the testing is completed Transport Canada will mandate the installation of the new design of the main fitting as the terminating action for the AD's.
NTSB Probable Cause Narrative
Failure of the left main landing gear fitting due to a fatigue crack that emanated from multiple origins at the external surface of the wall at the shock strut radius run out area for undetermined reasons.
Event Information
| Type of Event | Accident |
| Event Date | 6/2/2002 |
| Event Day of the Week | Sunday |
| Time of Event | 2200 |
| Event Time Zone | Eastern Daylight Time |
| Event City | Atlanta |
| Event State | GEORGIA |
| Event Country | -- |
| Zipcode of the event site | 30354 |
| Event Date Year | 2002 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 333843N |
| Event Location Longitude | 0842559W |
| Event Location Airport | Atlanta Hartsfield |
| Event Location Nearest Airport ID | ATL |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | 0 |
| Airport Elevation | 1012 |
| Weather Briefing Completeness | Full |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 2153 Eastern Daylight Time |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | ATL |
| Elevation of weather observation facility | 1012 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | EDT |
| Lighting Conditions | Night/Dark |
| 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) | 8 |
| Air Temperature at event time (in degrees celsius) | 25 |
| Dew Point at event time (in degress fahrenheit) | 21 |
| Wind Direction (degrees magnetic) | 340 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 7 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 29.02 |
| Density Altitude (feet) | 3269 |
| 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 | 53 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 18676 |
| NTSB Notification Source | FAA Com Center |
| NTSB Notification Date | Jun 2 2002 12:00AM |
| NTSB Notification Time | 2300 |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Oct 27 2005 6:51AM |
| User who most recently changed record | NTSB\JOHB |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Atlanta FSDO |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N849AS |
| NTSB Number | ATL02FA113 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Bombardier |
| Aircraft Model | CL600-2B19 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 7347 |
| Certified Max Gross Weight | 53250 |
| 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 | 54 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | May 27 2002 12:00AM |
| Airframe hours since last inspection | 17 |
| Airframe Hours | 6831 |
| ELT Installed | No |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | State Street Bank & trust Co of CT |
| Aircraft Owner Street Address | 225 Asylum Street |
| Aircraft Owner City | Hartford |
| Aircraft Owner State | CT |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 06103 |
| Operator is an individual? | No |
| Operator Name | Atlantic Southeast Airlines, Inc. |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 100 Hartsfield Centre Parkway Ste. 800 |
| Operator City | Atlanta |
| Operator State | GA |
| Operator Country | USA |
| Operator Zip code | 30354 |
| Operator Code | ASOA |
| Owner has at least one certificate | -- |
| 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 | Scheduled |
| Indicates Domestic or International Flight | Domestic |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | -- |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | BWI |
| Departure City | Baltimore |
| Departure State | MD |
| Departure Country | USA |
| Departure Time | 1940 |
| Departure Time Zone | EDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | ATL |
| Destination City | Atlanta |
| Destination State | GA |
| Destination Country | USA |
| Specific Phase of Flight | Landing - roll |
| Report sent to ICAO? | Yes |
| Evacuation occurred | Yes |
| Date of most recent change to record | -- |
| User who most recently changed record | -- |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 26R |
| Runway Length | 9000 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |