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ASN Wikibase Occurrence # 138341
Last updated: 20 January 2021
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Date:01-SEP-2011
Time:17:25
Type:Silhouette image of generic CRJ2 model; specific model in this crash may look slightly different
Bombardier CRJ-200ER (CL-600-2B19) Regional Jet
Owner/operator:Atlantic Southeast Airlines Inc
Registration: N875AS
C/n / msn: 7559
Fatalities:Fatalities: 0 / Occupants: 53
Aircraft damage: Minor
Category:Incident
Location:Baton Rouge Metropolitan Airport/Ryan Field - KBTR/BTR -   United States of America
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:Atlanta, GA (ATL)
Destination airport:Baton Rouge, LA (BTR)
Investigating agency: NTSB
Narrative:
While configuring the airplane for landing, the flight crew observed a landing gear disagree message and an indication that the left main landing gear was not down and locked. The flight crewmembers followed procedures to address the landing gear disagree message; however, they were unable to get the left landing gear to extend. The captain declared an emergency and chose to land the airplane with only the right main landing gear and nose landing gear extended. The airplane came to rest in an upright, left-wing-low position. Postincident examination of the left main landing gear system revealed that the upper attachment bolt for the left main landing gear uplock assembly, which is designed to be attached to both the uplock mechanism and the structure, was attached only to the airplane structure. The left main landing gear uplock assembly had been removed and reinstalled the day before the incident flight. The mechanic who performed the maintenance did not have training on nor prior experience performing the installation of the uplock assembly, and the maintenance inspector who inspected its installation did not have training on inspecting the uplock assembly. Neither the mechanic nor the maintenance inspector observed any problems during the postinstallation inspection. Thus, it is likely that the uplock assembly was installed incorrectly due to the lack of training in both the installation by the mechanic and the inspection by the inspector.
Probable Cause: The improperly installed upper attachment bolt in the left main landing gear uplock assembly, which led to the failure of the left main landing gear to extend before landing. Contributing to the accident was maintenance personnel's lack of training on the installation and inspection of the uplock assembly.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20110902X54326&key=1


Images:

Photo of N875AS courtesy AirHistory.net


Montréal - Pierre Elliott Trudeau International (CYUL / YUL)
22 March 2008; (c) Pierre Langlois

Revision history:

Date/timeContributorUpdates
02-Sep-2011 06:51 RobertMB Added
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 18:11 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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