During late 2000, it was revealed that an effort to reduce the Comanche's empty weight by approximately or 2.1 per cent in order to conform with its established target weight had been initiated. The first Comanche prototype, serial "94-0327", completed 318 flights over 387 hours before reaching the end of its testing career during January 2002. The second prototype, serial "95-0001", had accumulated 103.5 flight hours and 93 sorties by May 2001. During late 2001 and early 2002, testing with the second RAH-66 was halted while the aircraft underwent extensive modifications, received both mission equipment and more powerful T800-LHT-801 engines. On 23 May 2002, the second prototype re-commenced flight testing with the additional equipment fitted. Accordingly, the expanded test programme involved new aspects such as the testing of the armaments and night vision systems; these test flights continued into 2003. During testing, the Comanche was recorded as having attained a cruise speed of , as well as having achieved a "dash speed" of . It also demonstrated ability to perform a 180° turn in under five seconds.