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The core of the baseline D model weapon system is a highly integrated digital package, building upon the Mil-Std-1553B bussing technology of established "federated" architectures, but providing significant interlinking of onboard systems via software. Modern commercial 32-bit processors are employed.
Experience from the F-15E crew station design was applied by engineers with prior involvement in that project, to provide a glass cockpit and "HOTAS" control interface in the new digital "MANPRINT" cockpit.
The D model Apache is to other attack helicopters what the F/A-18A was to other fighters in 1978 - a wholly digital system which hides the vehicle and system complexities under a clean, synthetic interface provided by software.
While the crew now see a revised cockpit with HOTAS controls, a pair of colour LCD menu driven displays and keypad, the capabilities hidden within the system run much deeper. All aircraft vital functions are monitored by software with extensive BIT support embedded. A dual RLG INS/GPS navigation system, supplemented by Doppler nav for accurate velocities, provides for extremely accurate navigation. An enhanced autopilot with attitude, altitude and position hold in hover takes the effort out of NOE "masked" hover behind covering terrain.
The Improved Data Modem (IDM) is employed to datalink threat and target information between AH-64D in a unit, or to allow uplinking or downlinking of such data to other aircraft. A JSTARS, satellite, UAV or manned SAR/GMTI recce asset can provide the AH-64D with target sets via the IDM, or upload recce from the Apache.
The datalinking facility is seamlessly integrated into the software, allowing the pilot or gunner to use mouselike screen click and drag operations to "segment" a target set and with a click of a button pass the targets to another AH-64D.
Software provides the ability to fuse data from the aircraft's sensors, and to fuse offboard and onboard sources. Any weapon can be targeted by any sensor, and sensors may be slaved to other sensors.
The weapon system is vastly more flexible than that in the AH-64A via the provision of Mil-Std-1760 "smart" digital station adaptors for all six wing stations. Any 1760 capable munition can be accommodated via a clearance test and software modification.
Two Army ARC-201 FM radios are carried, and a ARC-164 Have Quick II frequency hopper is fitted, together with a ARC-186 VHF-AM radio. All may be accessed through the IDM under software control, to provide transparent digital access to other assets.
This is baseline AH-64D Apache weapon system, common to all aircraft and the configuration for 3/4 of US Army deliveries, and all Netherlands deliveries.
An optional fit to this baseline configuration is the Longbow weapon system, comprising the Northrop-Grumman (previously Westinghouse) AN/APG-78 Longbow mast mounted Fire Control Radar (FCR), and a Lockheed-Martin AN/APR-48 Radar Frequency Interferometer (RFI) package, both designed for all weather operation through precipitation and battlefield obscurants. The Longbow weapon system supports the AGM-114L active radar guided missile, operating in the same millimetric band as the radar.
