The Incident At about 1138 Mountain Standard Time on December 29, 2010, a American Airlines Boeing 757-200 tail number N668AA, flying as flight 2253, rolled …show more content…
During the incident landing the air/ground sensing system had a momentary interruption in the system from “ground” (once the wheels were down), back to “air”, and then back to “ground”. During this interruption, the thrust reversers locked out in transit. Once the crew manually recycled the system, it deployed as expected. However, this recycling of the system cost the airplane 18 seconds. The NTSB concludes that, although the momentary interruption of the air/ground system’s “ground” signal after touchdown would not normally adversely affect the deployment of thrust reversers, in this case it coincided almost precisely with the initial deployment of the thrust reversers and resulted in the thrust reversers locking in transit instead of continuing to deploy (NTSB,