At 35,000 ft, 250 KIAS is approximately 430 KTAS. And the speed of sound at 35,000 on a standard day is 574 knots vs. 661 knots at sea level.

IAS and TAS both decrease with altitude with IAS decreasing at a higher rate than TAS. So as you climb AOA will increase to provide the same amount of lift in a constant MACH climb. At least that's what I think...

Thanks guys, so the correct answer would be decrease in TAS, decrease in IAS and increase in AOA?

about 2-3 weeks ago for MSP. They have always paid for STL

It's true your AOA increases with altitude, but in the context of this question... May be underthinking this, but would your angle of attack decrease in speed mode so as to maintain the same speed in the climbout? That's why you occasionally need to reduce the speed or go to VS as you near your level-off - to get the nose back up.

I think I may have been underthinking it. I just generalized the terms. Most the time, at least in cruise, higher alt= higher TAS, lower IAS and higher AOA than at lower altitudes (IAS is higher, TAS is lower, AOA may not change noticeably).

But yes, I correct myself. (late night half asleep thinking got me on my response last night)
IAS and CAS decrease, TAS decreases (if temp decreases). FAA Pilots Handbook of Aeronautical Knowledge. See this link, top right paragraph of page 4-41 if it doesnt show it right away.
The question remains in my mind about the AOA. Assuming constant weight (obviously not possible) As TAS and IAS/CAS decrease, AOA would need to decrease to keep speed up as airspeed falls off. However, I dont know how significant fuel burn adds complexity to this. Maybe its near constant


https://books.google.com/books?id=1H...%20aoa&f=false

As speed decreases, AOA will need to increases to maintain the same amount of lift.

If airspeed is constant and all the changes is altitude. A higher altitude will require a higher AOA, due to the density of air changing.

Not sure I quite get what you are asking, but I'll attempt an answer.

The thing that governs climb rate in an aircraft is excess thrust available over that is required for level flight at a given speed.

The reason you may have to reduce speed in a climb up to altitude is that the thrust available is insufficient to maintain your desired climb rate, altitude, and airspeed at the same time.

Anyone got a seniority list? How junior did the award go? Last alternate?

most jr CA is a 10/14 hire

FWIW, nobody will ever, ever, ask you that Mach question outside of the test.

Not on your interview. Not in training. Not on IOE. Not on the line. Not in recurrent. Not ever. :-)

Keep it above green dot, below V/MMO and you'll be fine.