And just to be sure - the RFM (as approved) would overrule all of 91, 135, Ops Spec etc.
It is part of Type Certificate. If the RFM prohibits then the only way around it is an STC and RFM Supplement..
Agreed...if that is how the TCDS reads and/or the limitations section in the manual. I never flew a B3E but I have a lot of time in the AS350 BA and B2---neither of those have any limitation prohibiting the pilot from leaving the aircraft running.
or just operate the aircraft in a manner that means you won't ever need to argue in a court of law or in front of grieving relatives - ie don't take unnecessary risks where there is no absolute NEED to.
Agree to a point---the law is constantly changing. Like chopjock states....one could argue there is never a need to fly a helicopter.