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Ac 20 191 2026

The document is an Advisory Circular (AC) from the U.S. Department of Transportation's Federal Aviation Administration (FAA) that outlines airworthiness criteria for airborne systems used in low-visibility conditions during takeoff, precision approach, landing, and rollout. It provides guidance on compliance with performance, integrity, and availability standards for Category II and III weather minima operations using Instrument Landing System (ILS) and Ground Based Augmentation System (GBAS). The AC updates previous guidance documents and includes detailed chapters on takeoff guidance systems, operational approvals, and specific requirements for various aircraft systems. It also contains appendices with definitions, acronyms, wind models for simulation, GBAS performance models, and example provisions for Aircraft Flight Manuals (AFM).

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Click ‘Get Form’ to open AC 20-191 in the editor.
Begin by reviewing the purpose section (Chapter 1) to understand the airworthiness criteria for low visibility operations.
Navigate to Chapter 2, which outlines the scope and applicability of the advisory circular. Fill in any required information regarding your specific aircraft type.
Proceed to Chapter 3, focusing on the takeoff guidance system. Ensure you complete all fields related to airworthiness criteria and equipment used for low visibility takeoff.
Continue through Chapters 4 and 5, providing details on Category II and III operations as applicable. Make sure to address all performance requirements outlined.
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Ac 20 191 2026

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