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Pursuant to a congressional request, GAO reviewed the Federal Aviation Administration's (FAA) Traffic Alert/Collision Avoidance System (TCAS), focusing on: (1) pilots' and air traffic controllers' views on TCAS; (2) FAA actions to address TCAS problems; and (3) key aspects of FAA software development and testing for TCAS, including FAA verification and validation plans for the system.

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Recommendations for Executive Action

Agency Affected Recommendation Status
Department of Transportation 1. The Secretary of Transportation should direct the Administrator, FAA, to follow through on current plans to: (1) fully verify and validate all future significant modifications of TCAS; (2) effectively involve TCAS users and other interested parties in testing modifications through commenting on and questioning the test methodology and results; and (3) address all users' concerns.
Closed - Implemented
FAA is verifying and validating TCAS software. Users are participating in the process through various committees and or task forces.

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