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20-147 - Turbojet, Turboprop, and Turbofan Engine Induction System Icing and Ice Ingestion (Cancelled)

Cancellation Notes
AC 20-147A
Date Cancelled
October 22, 2014
Date Issued
February 02, 2004
Responsible Office

This advisory circular (AC) provides guidance and acceptable methods, but not the only methods, for demonstrating compliance with the applicable engine induction system icing and engine ice ingestion requirements. These requirements are applicable to the Federal Aviation Regulations, parts 23, 25, and 33 of Title 14 of the Code of Federal Regulations (14 CFR parts 23, 25, and 33). The primary purpose of this AC is to reduce inconsistencies and eventual surprises to both engine manufacturers and engine installers, when installing a part 33 certified engine in a part 23 or 25 aircraft.