Army Preliminary Evaluation. YAH-1S Helicopter with Modified Flat Plate Canopy Installed.
Final rept. 18 Mar-15 Jun 77,
ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CALIF
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The United States Army Aviation Engineering Flight Activity conducted an Army Preliminary Evaluation of the YAH-1S helicopter to determine the effect of the modified flat plate canopy installation on performance and combined effects of the canopy and the Kaman K-747 rotor on handling qualities. The helicopter was tested from 18 March through 15 June 1977 at Edwards Air Force Base, California. During the test, 28 flights totaling 23.8 productive flight hours were flown. The increase in equivalent flat plate area due to the modified flat plate canopy installation was approximately 3 square feet. Two deficiencies noted during this evaluation were the high intensity of mirror images of both internal and external light sources on the modified flat plate canopy during night flight and the designlocation of the night vision goggle switch, which is conductive to inadvertent deactivation of the visual fault warning system. A total of nine shortcomings were noted. Author