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Old 23rd July 2010 | 07:57
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BBadanov
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From: Land of Oz
According to "US Military Aircraft Designations and Serials" by J M Andrade, pg.125.

UH-1B c/n 881/883 ex 63-12953/12955 [became N9-881/883]
UH-1C c/n 3101/3104, ex 64-17621,22,23, and 65-12846 [became N9-3101/3104]

"UH-1C late production UH-1B but modified rotor and increased fuel capacity."

I believe you can visually distinguish between the two by the air vents on the roof around the rotor shaft?
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