How Did American Airlines Not Clean The Air Turbine Filter

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1. American Airlines’ maintenance personnel did not clean the air turbine starter valve-air filter in accordance with its “C” check cleaning procedures and, therefore, missed an opportunity to identify and replace the damaged filter. The filter disintegrated, freeing the end cap, which blocked air-flow, causing the no-start condition. 2. Incorrect focus was placed on the ATSV and engine start wiring because the nature of the condition appeared to be intermittent, as well as the history of electrical issues with the ATSV circuitry and a lack history of ATSV filter failures. 3. American Airlines personnel repeatedly used unauthorized procedures and unapproved tools to push the ATSV manual override button, resulting in damage to the internal pin of the …show more content…

The pilots may not have immediately detected the air turbine starter valve (ATSV) - Open light illumination because of its location, static appearance, and color. Once they detected the light, the pilots did not immediately respond to it because an open ATSV was considered an abnormal situation that did not require immediate action. 5. The pilots failed to properly allocate tasks, including checklist execution and radio communications, and they did not effectively manage their workload; adversely affecting their ability to conduct essential cockpit tasks, such as completing appropriate …show more content…

American Airlines’ maintenance personnel were using maintenance procedures that were not in accordance with written manuals and guidelines, and it’s Continuing Analysis and Surveillance System program did not adequately detect and correct these performance deficiencies before they contributed to an accident. The FAA had also been found negligent in monitoring and inspecting Americans’ CASS program, as required by their own regulations. This finding was the result of an independent audit by the DOT following the accident in response to allegations of reduced reliability of American Airlines systems and

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