The AH-64 is a two-seat attack helicopter powered by two General Electric T700 turboshaft engines, with high-mounted exhausts on either side of the rotor shaft. The crew sit in tandem, with the pilot sitting behind and above the gunner. The crew compartment is armoured against 20mm gunfire. The helicopter is armed with a 30mm M230 chain gun which is slaved to the gunner's helmet-mounted gunsight. The AH-64 carries a range of external stores on its stub-wing pylons, typically a mixture of AGM-114 Hellfire anti-tank missiles Hydra 70 general-purpose unguided 70mm rockets, and AIM-92 Stinger anti-aircraft missiles for defence. In case of emergency the pylons also have mounting points for personnel transfer.
Two major models of AH-64 Apache are in service in the US Army; AH-64A (USAR and ARNG) and AH-64D (Active). An AH-64B variant was designed for naval operation (Marine Corps), but never manufactured.[citation needed] As of 2007 the Marine Corps still uses the AH-1 Cobra. When development of the D model started, the corresponding radarless version initially had the designation AH-64C. However, since the only difference between the C model and the radar-equipped D model was the radar, which could be moved from one aircraft to another, a decision was made to not distinguish between the two versions, irrespective of the presence or absence of the radar. A number of other models have been derived from both AH-64A and AH-64D for export. The British-built Westland WAH-64 (assembled from kits purchased from Boeing) is based on the AH-64D with several different systems, including newer engines.
Built to endure front-line environments, it can operate during the day or night and in adverse weather using the integrated helmet and display sight system. The Apache is also equipped with some of the latest avionics and electronics, such as the Target Acquisition and Designation System, Pilot Night Vision System (TADS/PNVS), Black Hole passive infrared countermeasures, nap-of-the-earth (sic) navigation, and GPS.
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