4 ms·

FAR 25.173 says nothing about electrical failure. Indeed at the sizes of aircraft we’re taking about the pilot is just not going to be strong enough without hy

• salawat 7y ago
  The regulation doesn't, no, the technical details of MCAS as a piece of software necessary to maintain airworthyness however, demand the flight control computer be able at all times to work as designed to maintain the regulated condition of airworthyness. Namely, no control stick force inversions on approach to stall. It's kind of hard to do that with a computer if you've lost your electrics. Therefore either the system needs to be bulletproof, or you should have designed out the need for the crutch in the first place. Not gone and made a Frankenstein's monster of a plane.
• bdavis__ 7y ago
  leaving out the discussion of how much force is required and how strong a pilot is, the hand crank for the stab trim has mechanical leverage. the pilot turns a crank that is geared to move a cable. the amount of leverage is determined by mechanical design. it could be geared to move a stabilizer on a plane N times as large...more turns though.
  • salawat 7y ago
    It still runs into problems where in general, the electronic manipulation is what pilots muscle memory develops around, and the more mechanical advantage is utilized, the faster the wheel turns in the cockpit during normal operation. Those wheels are already notorious for the punishment they can subject an errant kneecap to.