Individually Owned: 151,845
Corporate Owned: 143,699
Hartsfield Jackson Atl Inter. Airport
Aircraft Accident/Incident Report
Atlanta, Georgia 30337
Thursday, June 11, 2009 18:40 EDT
NTSB Narrative Summary Released at Completion of Accident
While configuring the airplane for landing, the left main landing gear light indicated that it was not down and locked. The flight crew accomplished the landing gear abnormal procedures, including recycling the landing gear once. The left main gear continued to indicate unsafe, and the captain landed the airplane. After touching down on the right main and the nose gear, the captain used right aileron to keep the left wing up as long as possible. The left wing eventually dropped to the runway and the airplane came to a stop at the runway’s left edge. During recovery of the airplane, the left main gear was partially extended, and no physical obstructions were observed that would prevent the gear from extending. Loosening a hydraulic line to the left main gear actuator allowed the gear to fall into the extended and locked position. The airplane was examined and the landing gear was cycled numerous times using the normal and alternate extension methods. The examination failed to duplicate the incident conditions; the gear extended and retracted normally without hesitation or binding. All major components of the main landing gear system, including the left main landing gear, left gear door, hydraulic pumps, valves and actuators were examined at the manufacturers’ facilities. Although some minor anomalies were noted, no evidence was found to explain the failure of the gear to extend. Analysis of fluid from the numbers 2 and 3 hydraulic systems revealed that the fluid exceeded the maximum particle contamination limits. The system 3 sample also contained metallic particles. Hydraulic system 3 powers gear extension and retraction. After the incident, the operator enhanced its maintenance procedures for testing hydraulic fluid to include contamination. The operator also added verbiage to its pilot procedures to further explain that, in certain cases, it is appropriate to make several attempts at normal gear extension and provided more explanation and guidance regarding the use of the back-up (freefall) system.
NTSB Probable Cause Narrative
The failure of the left main landing gear to extend due to high levels of particulate contamination in the hydraulic fluid.
Event Information
| Type of Event | Incident |
| Event Date | 6/11/2009 |
| Event Day of the Week | Thursday |
| Time of Event | 1840 |
| Event Time Zone | Eastern Daylight Time |
| Event City | Atlanta |
| Event State | GEORGIA |
| Event Country | -- |
| Zipcode of the event site | 30337 |
| Event Date Year | 2009 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 333812N |
| Event Location Longitude | 0842541W |
| Event Location Airport | Hartsfield Jackson ATL Inter. |
| 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 | -- |
| Airport Elevation | 1026 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1852 Eastern Daylight Time |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | ATL |
| Elevation of weather observation facility | 1026 |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | EDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 25000 |
| Lowest Non-Ceiling Height | 3500 |
| Sky/Lowest/Cloud Conditions | Few |
| Sky Condition for Lowest Ceiling | Broken |
| 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) | 280 |
| 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) | 29.88 |
| 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 | 22 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 28137 |
| NTSB Notification Source | FAA Southern ROC |
| NTSB Notification Date | -- |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | May 25 2011 3:10PM |
| User who most recently changed record | johb |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N857AS |
| NTSB Number | ERA09IA338 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 121: Air Carrier |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | Minor |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | BOMBARDIER INC |
| Aircraft Model | CL-600-2B1 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 7411 |
| Certified Max Gross Weight | 53250 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | 3 |
| Cabin Crew Seats | 2 |
| Passenger Seats | 50 |
| Total number of seats on the aircraft | 55 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Jun 1 2009 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 22266 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | U S BANK NA TRUSTEE |
| Aircraft Owner Street Address | 1 FEDERAL ST |
| Aircraft Owner City | BOSTON |
| Aircraft Owner State | MA |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 02110 |
| Operator is an individual? | No |
| Operator Name | Atlantic Southeast Airlines |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 990 Toffee Terrace |
| Operator City | Atlanta |
| Operator State | GA |
| Operator Country | USA |
| Operator Zip code | 30354 |
| Operator Code | ASOA |
| Owner has at least one certificate | Yes - certificate holder |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | ASOA029B |
| 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 | CSG |
| Departure City | Columbus |
| Departure State | GA |
| Departure Country | USA |
| Departure Time | 1725 |
| Departure Time Zone | EDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | ATL |
| Destination City | Atlanta |
| Destination State | GA |
| Destination Country | USA |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Mar 28 2011 2:18PM |
| User who most recently changed record | kenj |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 27R |
| Runway Length | 11890 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |