ASN Wikibase Occurrence # 65584
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| Date: | Thursday 11 June 2009 |
| Time: | 17:40 LT |
| Type: |  Bombardier CRJ-200ER |
| Owner/operator: | Atlantic Southeast Airlines, opf Delta Connection |
| Registration: | N857AS |
| MSN: | 7411 |
| Year of manufacture: | 2000 |
| Total airframe hrs: | 22266 hours |
| Engine model: | GE CF34 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 22 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) -
 United States of America
|
| Phase: | Landing |
| Nature: | Passenger - Scheduled |
| Departure airport: | Columbus-Metropolitan Area, GA (CSG/KCSG) |
| Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause: The failure of the left main landing gear to extend due to high levels of particulate contamination in the hydraulic fluid.
Accident investigation:
 |
|
Sources:
NTSB ERA09IA338
http://www.cbs46.com/news/19729929/detail.html
https://flightaware.com/live/flight/ASQ5414/history/20090611/2124Z/KCSG/KATL
https://www.faa.gov/data_research/accident_incident/preliminary_data/events01/media/07_857AC.txt
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Jun-2009 23:39 | harro | Added |
| 11-Jun-2009 23:48 | harro | Updated |
| 11-Jun-2009 23:50 | harro | Updated |
| 12-Jun-2009 23:29 | harro | Updated |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
Corrections or additions? ... Edit this accident description
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