Originally Posted by
Domi
new OEB says HiBank only if IAS > icing bug + 30kts (30 !) in severe icing condition, otherwise LoBank - AND consider to descend to maintain the required speed.
Not only against you but this whole is hard to believe.
Actually they did a test flight. They managed it to figure out the maximum level in ice =FL130. They stalled the aircraft at KIAS 165!
Manufacturer say >red bug speed< +10- what means 175 KIAS is recommended. That is 10 knots margin above actual stall speed.
The report cite a server ice CL- what demand minimum ice speed +10.. Is that to understand as (red bug speed/165 +10) +10 = 185 KIAS ?!
And dear Domi, never ever accept any >high bank< (what a term). Many flight directors have a small bug, omitting half bank in case pilot selecting >direct to<. You could choose pilot off FD or use a bank mode.
Generally is a lack in understanding the stall subject.
Lift oppose weight. But that is valid only under the premise, continuous unaccelerated flight.
The weight is mass multiplied by G-load. A = Mass x G-load
If you fly, like in this case, exactly at stall speed, any increase of G-load will immediate stall the wing. For that in ice, always fly above stall speed for ice, avoid any turns, avoid accelerations.Those is part of aviate, what comes before CL.
If a stall occur, reduce the actual stall speed. Push gently the yoke forward. That way you fly a ballistic curve, that reducing the G-load, that reduce the stall speed!
If a spontaneous roll occur, avoid big aileron inputs. That will increase the average angle of attack, of the aileron of outer/upper wing. That part will likely stall, aircraft bank to opposite side. (In our case reached 73°).
As you loose altitude/dive; airspeed will increase, so normal airflow should reestablish.
During recovering; likely to divert from given clearance and stall is to report as well as severe ice, if you anticipate over-stress aircraft need to report . But relevant call is PAN. Mayday is movie style as in Sullivan Movie, irl commander did no std distress call.
In conclusion, I would say, this report is to revoke.