Carb Heat

Pro Member Trainee
JLaw Trainee
Joined: Nov 24, 2005 Posts: 5 Location: Woodlands, TX
Asked
Sat Dec 16, 2006 2:08 pm

Hello all, thanks for all the great information on this site. Lots of really good info for folks like myself who can't afford the real thing yet and take the "game" WAY to serious!! 😂

I have a question on carb heat and how it's used in real airplanes. I spend most of my time in a C152 and Piper Warrior by justflight.com, their Flying Club cd to be exact. I see that it's said in the checklist to apply carb heat before reducing power for the descent. Is carb heat neccessary all the time when reducing power, or reducing power for descent, or just reducing power for a quick altitude change? What if you're flying at 2000' above Houston, TX in the middle of summer? Forgive my ignorance, just trying to learn a few things here, probably the first question of many!

Thanks in advance, and thank you for a great web site.

JLaw

Answers 3 Answers

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Pro Member Chief Captain
CRJCapt Chief Captain
Joined: Sep 12, 2005 Posts: 3724 Location: Ohio,USA
Answered
Sat Dec 16, 2006 2:18 pm

Carburetor heat is required whenever you reduce power, even in the summer, because of the reduction in the temperature within the carb. This temperature reduction, along with reduced clearance of the throttle plate(when in the idle position), can cause ice to form with a outside temperature of even 70 degrees F. 🙂

Read page 83(book page Chapter 5-6) in this PDF file of The Pilots Handbook of Aeronautical Knowledge from the FAA.

Pro Member Trainee
JLaw Trainee
Joined: Nov 24, 2005 Posts: 5 Location: Woodlands, TX
Answered
Sat Dec 16, 2006 2:56 pm

WOW! 😳

Thats a wealth of information there, thank you for the link!

JLaw

Pro Member First Officer
spitfiresrule First Officer
Joined: May 17, 2005 Posts: 208
Answered
Sun Dec 17, 2006 10:12 pm

Carb heat also aids in keeping the engine warmer when you are decending so that you don't shock cool the engine.

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