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ASN Wikibase Occurrence # 147065
Last updated: 10 November 2020
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Date:21-SEP-2005
Time:18:18
Type:Silhouette image of generic A320 model; specific model in this crash may look slightly different
Airbus A320-232
Owner/operator:JetBlue Airways
Registration: N536JB
C/n / msn: 1784
Fatalities:Fatalities: 0 / Occupants: 146
Other fatalities:0
Aircraft damage: Minor
Category:Incident
Location:Los Angeles International Airport, CA (LAX) -   United States of America
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:Burbank, CA (BUR)
Destination airport:New York, NY (JFK)
Investigating agency: NTSB
Narrative:
JetBlue Airways flight 292, an Airbus A320, N536JB, landed at Los Angeles International Airport, California, with the nose wheels cocked 90 degrees.
The first officer (FO) was the pilot flying. He noted no problems during the initial departure, and observed a positive rate of climb. Shortly after the landing gear handle was positioned to the up position in the initial climb, the flight crew noted an error message on the Electric Centralized Aircraft Monitoring (ECAM) system listing a fault (L/G SHOCK ABSORBER FAULT) message for the nose landing gear (NLG) shock absorber. The gear handle was then moved to the down position and the crew received an error message of a fault for the nose wheel steering (WHEEL N/W STRG FAULT). After determining that the nose landing gear was cocked 90 degrees, the crew landed at an alternate airport, and the NLG tires and both wheels were worn down into the axle. Post incident examination of the nose gear assembly found that two of the four anti-rotation lugs on the NLG upper support assembly fractured and separated due to induced fatigue from the stearing system's programed pre-landing dynamic steering tests that repeatedly cycles pressure to the stearing cylinders. The failed lugs allowed the NLG to deviate from its 0-degree position in the landing gear bay upon gear retraction on takeoff. This resulted in the L/G SHOCK ABSORBER FAULT error message on the ECAM system. When the pilots extended the incident airplane's landing gear, the nose gear achieved the down and locked position 1.5 seconds before the main gear and/or all of the landing gear doors closed. The nose wheel assembly was not centered at this time. The Brake Steering Control Unit (BSCU) detected this off center condition of the NLG and attempted to re-center the nose wheel; however, due to the sequencing of the nose and main landing gear and their respective doors, hydraulic pressure was shut off to the NLG steering valve. This lack of hydraulic power to the servo valve resulted in a lack of position feedback to the BSCU. After a 0.5-second monitoring time period, the BSCU detected this as a fault and deactivated the steering system so that the BSCU could not return the nose wheels to center. Failure of the nosewheels to center initiated a WHEEL N/W STRG FAULT caution message on the ECAM. There were no approved procedures that allowed the flight crew to attempt to reset the BSCU system, which would have re-enabled the hydraulic system and could have resulted in the system recentering the nose wheels.

Probable Cause: The fatigue failure of two anti-rotation lugs due to repeated cyclic pre-landing tests, which allowed the nosewheels to deviate from the 0-degree position on landing gear retraction. A contributing factor was the design of the Brake Steering Control Unit (BSCU) system logic, which prevented the nosewheels from centering. Also contributing was the lack of a procedure to attempt to reset the BSCU system under these conditions.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20050927X01540&key=1

Media:


Images:


Photo (c) Andrewmarino

Revision history:

Date/timeContributorUpdates
26-Jul-2012 07:20 harro Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
06-Dec-2017 15:33 ASN Update Bot Updated [Operator, Departure airport, Destination airport, Source, Narrative]
24-Mar-2018 20:36 harro Updated [Operator, Embed code, Narrative, Photo, ]

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