A Sikorsky H-37 (S-56) piston-engined heavy-transport helicopter carries a 9200-lb (4173 kg) transmission tower for installation by Appalachian Power Co. in the hills of West Virginia. The aircraft has been acquired by Helicrane Construction Corp (a subsidiary of Keystone Helicopter). of West Chester, PA. 

From Vertiflite, January/February 1974 (page 18).

Keystone Helicopter Corp. H-37 (S-56)

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A Sikorsky H-37 (S-56) piston-engined heavy-transport helicopter carries a 9200-lb (4173 kg) transmission tower for installation by Appalachian Power Co. in the hills of West Virginia. The aircraft has been acquired by Helicrane Construction Corp (a subsidiary of Keystone Helicopter). of West Chester, PA.

From Vertiflite, January/February 1974 (page 18).

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Added to Vertiflite Images and categorized in 2 years ago

 

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