Pilot/engineer ground runs
The relevant reference in Europe is JAR-Ops 3.210(d) which requires specific rules be layed down as to who may run the helicopter apart from qualified pilots. This is expanded in an AJC OPS 3.210(d). Normally once the rotors are turning the helicopter is capable of flight or toppling over. Therefore as a general rule we allow only qualified pilots but other personnel may be cleared under laid down provisos.