'TIs the season for carb ice".........

[TeePeeCreeper]

Regardless, why would you want to use more heat than required?
The mixture only gets richer, fowled plugs and a loss of performance results...

I personally rather use partial carb heat. It also beats scaring passengers when applying full carb heat quickly and having that ice cause a "sputter"...

[7ECA]

Regardless, why would you want to use more heat than required?
The mixture only gets richer, fowled plugs and a loss of performance results...

I personally rather use partial carb heat. It also beats scaring passengers when applying full carb heat quickly and having that ice cause a "sputter"...

In the event you need to use full heat for an extended period of time, lean the mixture out.

[photofly]

You should adjust the throttle (open) and mixture (leaner) after any long term application of any amount of carb heat. Then no power loss, no fouling. Unless you habitually cruise at full throttle.

[goingnowherefast]

This shouldn't be a tough concept.
If you suspect carb ice, use full carb heat until it's gone. Adjust throttle/mixture if you feel it's necessary. Small Lycomings are very simple, dependable engines, they won't detonate in cruise with carb heat. These engines put up with student abuse all day long (forgetting to push the mixture rich during a touch-n-go, running full rich in the circuit for hours).

If you have a carb temp gauge, use partial carb heat to keep it in the safe range. Chances are you are flying a big piston too, and you have the experience and training to know what your doing.

There's a reason it's always "old FAA documents" and the "owners manual for early 172s" that mention partial carb heat. By the time they wrote the newer FAA documents and late model 172 manuals, they had learned from experience. Plus, if it's a boosted engine, then there's probably a carb temp gauge anyway.

[photofly]

I'm not usually with the "if XYZ is too difficult for you then you shouldn't be flying an airplane" club, but in this case, if the need to adjust the throttle and mixture after application of carb heat is considered "a tough concept" ...

[Rookie50]

I read that too, it seems to make sense.

But if you suspect (or are trying to avoid) carburettor icing, why would you not want full carb heat on?

Absolutely, bit of thread drift. In my case I only had it on the ground that day .(and I think only one or 2 other times -- both on the ground as well)

That day due to conditions I was a bit more aggressive with carb heat early in descents with reduced power -- just in case --

[GyvAir]

Just to add to the drift and muddy the waters a little more..
I've been told by a couple owner/instructors that they tell all their students to simply keep the carb heat either fully closed or fully open, on the theory that with the flap held firmly against one side of the box or the other, rather than being steadied purely by the typically wonky cable linkage, it won't tend to flutter/vibrate and cause unnecessary wear to the bushings, box sides and cable.