Fzra +fzra -fzra?

[B737Dvr]

huh???

What kind of ice protection is on the tail of the 74? A friend mentioned no ice protection on the tail of a 76. How does this work in stuff like freezing rain?

jet transports (at least the ones i have flown) all have no ice protection on the tail. not needed, due to the aerodynamics and negative lift profiles...

learjets, hawkers, falcons, boeing 727, 737 for my experience

 

[Occam's Razor]

jet transports (at least the ones i have flown) all have no ice protection on the tail. not needed, due to the aerodynamics and negative lift profiles...

learjets, hawkers, falcons, boeing 727, 737 for my experience

All DC-9 series aircraft have tail anti-ice systems. It's engine bleed air that also supplies the wing anti-ice.

 

[Flyoa1]

121.629 (a) is pretty subjective. However I think if you take a look at some of the research done by the NASA Icing Research guys after the ATR Roselawn accident, they hit the nail on the head and describe Supercooled Large Droplets (SLD) as water doplets larger than 50 microns, which includes freezing rain and freezing drizzle. I dont know of any airplane certified to fly in SLD. FAR 25 even outlines aircraft icing certification requirements only up to water drops as large as 40 microns. So anything over that = test pilot. Probably not a real good idea to be flying in freezing anything.

Kind of interesting that FAR 25 icing requirements only call for aircraft certification up to 40 microns, but NASA reports freezing rain and freezing drizzle are considered SLD and are 50 microns. hmmm?? Looks like the FAA didnt learn much from Roselawn.