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and accelerating to the one-engine inoperative climb-out speed. At any time prior to reaching the decision altitude, the pilot could, of course, return to the heliport in the event of a powerplant failure. (Reference Chart 4.) The engine take-off power contingency rating approved by the Federal Aviation Agency will permit the pilot to achieve a satisfactory climb-out gradient, or a safe and controlled descent to the heliport. Flight altitude can be maintained utilizing enroute cruise power on the remaining engine.
      Both the twin-engine Boeing V-107 and the Sikorsky S-61 have been specifically certificated by the Federal Aviation Agency for vertical rooftop heliport operations. The Boeing V-107 was certificated on 24 May 1962 and the Sikorsky S-61 on 26 April 1964. Both of these helicopters have been utilized extensively in rooftop heliport operations at the New York World's Fair this year. (Reference Chart 5.) Over 20,000 landings and take-offs have been accomplished passing over the heavily congested areas of the major exhibits. Abortive landing and take-off procedures have been repeatedly demonstrated in pilot training and proficiency flights. A number of precautionary landings have clearly demonstrated
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