Bell YAH-63
1975 prototype attack helicopter model by Bell Helicopter
The Bell YAH-63 (Model 409) was an experimental attack helicopter for the Advanced Attack Helicopter (AAH) competition. The Hughes Model 77/YAH-64, later developed into the AH-64 Apache, was selected over Bell's entry.
Design and development
Background
During the mid-1960s, United States Army initiated the Advanced Aerial Fire Support System (AAFSS) program to develop the Lockheed AH-56 Cheyenne for the anti-tank gunship role. The U.S. Army pursued the AH-1G HueyCobra as an interim type for the "jungle fighting" role. However the Army's broader concern was the task of protecting Western Europe from the numerous Warsaw Pact tanks to the east.
In 1972, the Army conducted an evaluation between the Bell 309 KingCobra, the Lockheed Cheyenne, and the Sikorsky S-67 in a competitive fly-off. The fly-off began in the spring 1972 and was completed in July. In August, somewhat to everyone's shock, the Army rejected all three competitors.
Difficulties delayed the AH-56 Cheyenne development. The Army canceled the Cheyenne program in August 1972.
The public source identifies “Bell YAH-63” as 1975 prototype attack helicopter model by Bell Helicopter. This brief keeps that definition visible, then builds a research path around Bell, YAH-63 and prototype.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 12, 2026. The linked authority identifier is Q815756. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1972.
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This entry incorporates text from “Bell YAH-63” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.