American Eagle E145 at Chicago on Jun 3rd 2011, brake separated during roll out
Last Update: November 8, 2012 / 12:28:15 GMT/Zulu time
A subsequent inspection of runway 22R found and recovered parts of a brake that had separated just south of the intersection with taxiway U.
The NTSB reported that parts of the number #3 (inboard right) brake had disintegrated and separated. The operator was asked to quarantine the brake and separated parts for further detailed investigation, the new brake was installed on the aircraft.
On Sep 22nd 2012 the NTSB released their factual report without providing an actual reason of why parts of the brake had disintegrated and separated, but focussed on the maintenance procedures to examine the brake's carbon disc for oxidation. The manufacturer had issued a plastic tool to perform a detailed visual inspection (DVI) which involved a sharp plastic stick (or finger nail) to detect oxidation of the carbon disc. The NTSB reported that 5 of 5 mechanics in 5 facilities did not have the plastic tool and were not aware of the DVI procedures. The brakes manufacturer subsequently performed training at the facilities and revised their documentation to clarify the DVI requirements. The operators maintenance facilities have all been equipped with the tool.
On Nov 8th 2012 the NTSB released their final report reporting, that five brakes assemblies including three of other occurrences had been shipped to the manufacturer for examination with all 5 assemblies having been found with oxidation of varying degrees, and concluding the probable cause was:
The overheat and failure the brake during landing due to oxidation of the brake rotors, which went undetected by maintenance personnel. Contributing to the accident was maintenance personnelÂ’s lack of familiarity with detailed brake oxidation inspection procedures.
This article is published under license from Avherald.com. © of text by Avherald.com.
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