Assertion: helicopter's rotor | /r/HasProperty | replaced with semi-articulated one
Facets:
value: due to control problems
type: CAUSE
value: on production aircraft
type: LOCATION
Source sentences:
text: The main rotor system was originally based upon the rigid rotor technology developed by Messerschmitt-Bölkow-Blohm for the MBB Bo 105; however, due to control problems experienced while at high speeds upon prototype aircraft, the rigid rotor was replaced with a semi-articulated one on production aircraft.