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In page Grumman E-2 Hawkeye:

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The first prototype, acting as an aerodynamic testbed only, flew on 21 October 1960. The first fully equipped aircraft followed it on 19 April 1961, and entered service with the US Navy as the E-2A in January 1964.[2] By 1965, the project had accumulated so many development issues that it was cancelled after 59 aircraft had already been built. In particular, difficulties were being experienced due to inadequate cooling in the closely packed avionics compartment. Early computers and complex avionics systems generated considerable heat and could fail without proper ventilation. These issues continued long after the aircraft entered service. At one point, reliability was so bad that the entire fleet of aircraft was grounded.[citation needed]