Sikorsky S-55/H-19
Milestones Associated with the Sikorsky S-55/H-19
November 10, 1949
YH-19 :
First flight of the prototype (YH-19) of the Sikorsky S-55/H-19 type series
July 31, 1952
S-55/HO4S-1/HO4S-2/HRS-2/HRS-3 :
First transatlantic helicopter flight completed (Sikorsky H-19A)
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