first time here :)
I'm part of the team at Flytrex (flytrex.com) and we're working with the Aircraft Certification Office to certify one of the first UAS systems (drones) under new initiative to certify drones for commercial use. We are currently at the stage that we need to define our system critical parts.
From what I understand, a Critical Part is defined as a single point of failure that will lead to a crash of the aircraft.
Since every component in our system includes redundancies, is it reasonable to claim that we don't have any Critical Part?
Single motor loss - the aircraft uses 6 motors and can sustain a single motor loss.
Multiple motor loss - an independent parachute system is deployed, taking the aircraft to the ground safely.
Flight controller loss - again, parachute will deploy.
Parachute system failure - the flight controller will bring the aircraft back to safe landing (abort mission).
I think we need a clearer understanding what is considered a critical part, and then try to define the right parts in our system.