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Sikorsky MH-60 Jayhawk
The Sikorsky MH-60T Jayhawk is a multi-mission, twin-engine, medium-range helicopter operated by the United States Coast Guard for search and rescue, law enforcement, military readiness and marine environmental protection missions. Originally designated HH-60J before being upgraded and redesignated beginning in 2007, the MH-60T is designed to fly a crew of four up to offshore, hoist up to 6 additional people on board while remaining on-scene for up to 45 minutes and return to base while maintaining an adequate fuel reserve. Normal cruising speed of the MH-60T is and the aircraft is capable of reaching for short durations. The MH-60T can fly at for six to seven hours.
Chosen to replace the HH-3F Pelican, the MH-60T is a member of the Sikorsky S-70 family of helicopters and is based on the United States Navy's SH-60 Seahawk helicopter. Development began in September 1986, first flight was achieved on 8 August 1989, and the first HH-60J entered USCG service in June 1990. Production ended in 1996 after 42 helicopters were produced; three retired SH-60F Seahawks were also remanufactured to MH-60T specifications beginning in 2010.〔 A total of 42 MH-60Ts are in service with the Coast Guard.〔(MH-60T: Jayhawk ). U.S. Coast Guard〕
==Development==
Chosen to replace the HH-3F Pelican, the HH-60J was based on the United States Navy's SH-60 Seahawk and a member of the Sikorsky S-70 helicopter family. Compared to its predecessor, the HH-3F, the HH-60J is lighter, faster, and equipped with more sophisticated electronics and more powerful engines.〔 The HH-60J was developed in conjunction with the U.S. Navy's HH-60H Rescue Hawk.〔Leoni, Ray D. ''Black Hawk, The Story of a World Class Helicopter'', pp. 212-213. American Institute of Aeronautics and Astronautics, 2007. ISBN 978-1-56347-918-2.〕
Sikorsky began development in September 1986 and aircraft registration number 6001 achieved first flight on 8 August 1989. The first aircraft was delivered to the USCG for developmental testing in March, 1990 at NAS Patuxent River, Maryland. In March 1991, ATC Mobile, Alabama became the first USCG unit to fly the HH-60J, allowing instructor pilots to prepare for pilot training. Coast Guard Air Station Elizabeth City, North Carolina was the first USCG operational unit to fly the HH-60J.〔 Sikorsky produced 42 HH-60Js with sequential registration numbers from 6001 through 6042. Sikorsky ceased production in 1996 after fulfilling the 42 unit contract. Subsequently, the Coast Guard has converted three ex-Navy SH-60F Seahawks into MH-60T Jayhawks (registration numbers 6043-6045) as attrition replacements.〔(SH-60F to MH-60T Conversion Process ), United States Coast Guard, 4 April 2014〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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