RVgrin wrote:Just watched "The Flight Line" episode (S02E07), which showcased the "nail biter" C-46 return from Holman Island to Yellowknife "running on f**ckin fumes". To save fuel Capt. Devon makes much of the 3-hour journey at 11,000 feet with no oxygen. (legal in USA, not so much in Canada.) Headache, anyone?
Okay, this is not meant to be a smart assed comment, but an honest question regarding this section of the CARS from someone who doesn't know better.
CARs reference:
Entire period of flight exceeding 30 minutes at cabin-pressure-altitudes above 10,000 feet ASL but not exceeding 13,000 feet ASL
I don't have all the data...and I'm just trying to think this through...but Cabin Pressure Altitude would also be density altitude right? If it was cold enough and the air dense enough, would it be permissible for an unpressurized plane to fly at 11,000 feet if the cabin pressure altitude(density altitude) is below 10,000 and thereby still be within the regulations?
Here's a calculation:
Altitude 11,000ft
OAT -30
Altimeter 30.14
Dewpoint -40
Equals a density altitude of about 8,460 feet.
I guess the gist of my question is: Are Cabin Pressure Altitude and Density Altitude in an unpressurized aircraft the same thing and if so, would it be legal for me to fly given the example above?