The test program was broken down into stages as the Bo 105 comprised a new airframe, new rotor system, and a new engine; thus the flying Bo 105 prototype was initially equipped with a main rotor from Westland Helicopter's Scout rotorcraft and a pair of Allison Model 250 turboshaft engines instead of their production counterparts.
O programa de probas divisíuse en etapas xa que o Bo 105 estaba formado por unha nova célula, un novo sistema rotor e un novo motor; así o prototipo para as probas de voo foi inicialmente equipado co rotor principal dun Westland Scout e un par de motores turboeixo Allison Model 250 en lugar dos seus equivalentes de produción.