The AH-64D Apache Longbow multi-mission helicopter is the next generation version of original AH-64A Apache. With its fire control radar, the aircraft is known as the AH-64D Longbow Apache. Without the radar, fighter aircraft tested is called the AH-64D Apache.
The AH-64D Apache Longbow increases combat effectiveness in the AH-64A, providing a more flexible digital architecture and the integration of electronics on board computer Built-In Test Equipment (BITE), automatic test equipment (ATE), and operator interactive electronic copy or Technical Manual (IETM) troubleshooting / maintenance that easily adapt to changes resulting from system growth.
In addition, improvements to power and cooling systems and the expansion of avionics bays forward to accommodate the installation of the FCR, and provide for future growth. Navigation system accuracy has been improved thanks to the integration of a built-in miniature integrated global positioning system (GPS) / inertial navigation unit (INU) (EGI), and improved speed Doppler speed sensor (DVRs).