Good question, and I can't give you an answer that applies to all
turboprops. The condition levers have an idle cutoff position, which is
about the only parallel with a mixture control that I can think of. Never
heard of a mixture control with low-idle and high-idle settings. IOW, it is
difficult to make an exact comparison.

This is from a C-90:

Propulsion Systems and Controls
Operated by three sets of controls:

Power Levers: control engine power from idle to take-off power by adjusting
the N1 speed governor in the FCU. Increasing N1 results in increased power.
Propeller Levers: Control the constant speed propellers through the Primary
Governor.
Condition Levers: 3 position lever; CUT-OFF, LOW-IDLE, and HIGH-IDLE.



In any event, almost 100 percent of all turboprop pilots are going to get
formal training (as I did, a long time ago, in a class with astronaut Alan
Shepard) before the insurance company lets them fly. THE COMPLETE
MULTIENGINE PILOT (title chosen by the publisher, not by me) is hardly the
place to look for details on turboprop operation.

I never flew with Garret engines, but I'll bet that there are plenty of
differences between them and PT-6s.



Bob Gardner





"Art Varrassi" wrote in message
news:_zXBd.608139$wV.310377@attbi_s54...

Bob, in your book "The Complete Advanced Pilot" - Third Edition, in the
section on turbine engines on page 13-6 you state:

"The control quadrant will have three sets of knobs, like any other twin,
but one set will be called 'condition levers'. The throttle and mixture
controls perform their usual functions, while the condition levers are
similar but not identical to prop controls."

Shouldn't that last sentence read: "The throttle and prop controls perform
their usual functions, while the condition levers are similar but not
identical to mixture controls."?

I am trying to get a better understanding of the use of the "condition
levers" and the effects of their settings of "High Idle" and "Low Idle".

Thanks,
Art Varrassi
PP-ASEL