(1) Two independent electrical power generating sources each of which is able to supply all probable combinations of continuous inflight electrical loads for required instruments and equipment; or
(2) In addition to the primary electrical power generating source, a standby battery or an alternate source of electric power that is capable of supplying 150% of the electrical loads of all required instruments and equipment necessary for safe emergency operation of the aircraft for at least one hour;
Appendix B to Part 27â€”Airworthiness Criteria for Helicopter Instrument Flight; and
Appendix B to Part 29â€”Airworthiness Criteria for Helicopter Instrument Flight.
As long as the FAA certificates the aircraft, what's the issue?
I am pretty good with the regulatory requirements...How about you???