Timed Turns

snOOp

snOOp

Well-Known Member
I was curious when do you do standard rate turns compared to half standard rate in timed turns.

I just can't seem to remember :insane:
 
Matt13C said:
The approach is half standard.
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Approaches are only half standard if it's an ASRor PAR!!! (ATC will tell you if they want a half rate turn, if you're going 400 kts it will require a 60 degree bank, therefore you do a half rate turn!)
Rate of turns really depend on the speed of the aircraft. The rate of turn is directly related to the airspeed. (IAS) The angle of bank required to achieve a standard rate turn is equivelant to a factor of approximately 15% of your IAS. example 100kias=15 degree bank. Now...lets accellerate to 200 kts..standard rate = 30 degrees bank. Consider a flight director and auto pilot on a transport aircraft. it will command you to make a bank angle that will give you a std rate turn. Unless that bank angle is greater than 25 degrees. A flight director will not command a bank greater than 25 degrees. In many cases (transport aircraft) youi have structural limitations, and for the autopilot, there is just too much going on for it to be able to fly a steeper turn than that.

OK...TMI, but standard rate turns are also not regulatory, ther is nothing in the FARS or AIM that says you have to make one. It does however give all involved an expectation of timing. Since IFR flying is really a game of expectations.
 
Ziggyfuzz said:
You too! Merry Christmas!
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Merry Christmas to all!!

Just to clarify though, I was refering to SEL and light twin operations where if you are doing timed turns there is a good chance you're no gyro with a lack of vacuum. Just the way I was taught, obviously not regulatory or required, but in a no gyro environment, I see no reason to go beyond half standard on an approach, especially at 400kts ha!

I cant even think of a situation where it would be required in a transport category aircraft these days. With triple redundant systems and back up MFD on battery power or RAT's. Is it a scenario discussed or practiced in a sim during training at air carriers?
 
It is a 'standard' on a no-gyro ASR or PAR. The controller expects, for spacing and timing, standard rate turns until on final, and then half standard rate on final.
 
nosehair said:
It is a 'standard' on a no-gyro ASR or PAR. The controller expects, for spacing and timing, standard rate turns until on final, and then half standard rate on final.
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Someone ought to teach these controllers about ASSuMEtions. Anyways, Merry Christmas to everyone as well.
 
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