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C-17 Globemaster III

The C-17 is the newest airlift aircraft to enter the Air Force's inventory. The C-17 is capable of rapid strategic delivery of troops and all types of cargo to main operating bases or directly to forward bases in the deployment area. The aircraft is also able to perform theater airlift missions when required.

The C-17's system specifications impose a demanding set of reliability and maintainability requirements. These requirements include an aircraft mission completion success probability of 93 percent, only 18.6 aircraft maintenance manhours per flying hour, and full and partial mission capable rates of 74.7 and 82.5 percent respectively for a mature fleet with 100,000 flying hours.

The C-17 measures approximately 174 feet long with a 170-foot wingspan. The aircraft is powered by four fully reversible Pratt & Whitney F117-PW-100 engines (the commercial version is currently used on the Boeing 757). Each engine is rated at 40,900 pounds of thrust. The thrust reversers direct the flow of air upward and forward to avoid ingestion of dust and debris.

The aircraft is operated by a crew of three (pilot, copilot and loadmaster). Cargo is loaded onto the C-17 through a large aft door that accommodates military vehicles and palletized cargo. The C-17 can carry virtually all of the Army's air-transportable, outsized combat equipment. The C-17 is also able to airdrop paratroopers and cargo.

Maximum payload capacity of the C-17 is 170,900 pounds, and its maximum gross takeoff weight is 585,000 pounds. With a payload of 130,000 pounds and an initial cruise altitude of 28,000 feet, the C-17 has an unrefueled range of approximately 5,200 nautical miles. Its cruise speed is approximately 450 knots (.77 Mach).

The design of this aircraft lets it operate on small, austere airfields. The C-17 can take off and land on runways as short as 3,000 feet and as narrow as 90 feet wide. Even on such narrow runways, the C-17 can turn around by using its backing capability while performing a three-point star turn. Maximum use has been made of off-the-shelf and commercial equipment, including Air Force standardized avionics.

The C-17 made its maiden flight on Sept. 15, 1991. The aircraft is operated by the Air Mobility Command with initial operations at Charleston AFB, S.C., with the 437th Airlift Wing and the 315th Airlift Wing (Air Force Reserve). The C-17 program is managed by the Aeronautical Systems Center, Wright-Patterson AFB, Ohio.

Service Life

Based on a buy of 120 aircraft, the last C-17 delivery will be in November, 2004. The original specification from McDonnell Douglas defined a service life of 30,000 hours. Modification programs will keep the aircraft in line with current and future requirements for threat avoidance, navigation, communications, and enhanced capabilities. These modifications should include global air traffic management (GATM) and automatic dependent surveillance to meet anticipated navigation requirements. Commercially available avionics and mission computer upgrades are being investigated to reduce life-cycle costs and improve performance. Also, upgraded communication systems to enhance worldwide voice and data (including secure) transmission will support command and control.

Specifications

Primary Function Cargo and troop transport
Prime Contractor Boeing [McDonnell Douglas Corp.]
Power Plant Manufacturer Four Pratt & Whitney F117-PW- 100 turbofan engines
Thrust (each engine) 40,900 pounds
Wingspan 170 feet 9 inches (to winglet tips) (51.81 meters)
Length 173 feet 11 inches (53.04 meters)
Height 55 feet 1 inch (16.79 meters)
Cargo Compartment Length - 85 feet 2 inches (26 meters);
width - 18 feet (5.48 meters);
height - 12 feet 4 inches (3.76 meters) forward of the wing
and 13 feet 6 inches (4.11 meters) aft of the wing
Speed 500 mph (Mach .77)
Service Ceiling 45,000 feet at cruising speed (13,716 meters)
Range Unlimited with in-flight refueling
Crew Three (two pilots and one loadmaster)
Maximum Peacetime Takeoff Weight 585,000 pounds (265,306 kilos)
Load 102 troops/paratroops;
48 litter and 54 ambulatory patients and attendants;
170,900 pounds (76,644 kilos) of cargo (18 pallet positions)
Date Deployed June 1993

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