Originally Posted by
welliewanger
- Stalling below FL150. "Stop deceleration if stick shaker has not occurred by 3kts below scheduled speed or if pusher has not operated by 2kts below scheduled speed"
What's the big deal about stalling an aircraft like this? People seem to get very shaky about wing drops etc. Maybe I've just got complacent with stalling "benign" aircraft like the C152. My personal favourite in that was to stall with full power and a steep turn! Do big aeroplanes really bite you on the bum that much worse?
Not too much below FL150, please.
Those "stop decel" criteria are (some of) your knockoff criteria. Those tolerances are the largest normally expected variation in shaker and pusher speeds. If you've got 4kts below predicted shaker speed and nothing has happened, it means that something 'strange' is going on. Best to give up, go home, and work out what is not right on the ground, rather than persevering and finding out the hard way.
The big deal is that the aircraft NEEDS the shaker and pusher - it does not have a stall that meets the certification requirements without those added systems. If everything goes according to plan its safe enough, but if someone failed to do the mx properly on the SPC, or something has happened to aletr the wing characteristics, like a misrigged slat or some such, you might be pushing the envelope.
The difference with other types such as the "benign" aircraft you mention is that they are designed to be stalled. The Global isn't. Its designed to stop you stalling it. You're going to deliberately ignore all the stuff put there to deter you and do it anyway.