SECTION 7
CUB CRAFTERS
AIRCRAFT AND SYSTEMS
CC11-100
REPORT SC10000AFM
Issued: 08/01/06
Page Number: 7-6
Date of Revision: 11/23/18
It is important that the pilot become knowledgeable about
carburetor icing and the use of the carburetor heat. Cub
Crafters recommends the following publication, available
from the FAA website:
Advisory Circular 20-113
-
Pilot
Precautions and Procedures to be taken in
Preventing Aircraft Reciprocating Engine
Induction System and Fuel System Icing
Problems.
WARNING
AS CARBURETOR ICE ACCUMULATES, IT
PRODUCES AN EXCESSIVELY RICH AIR/FUEL
MIXTURE. THE ENGINE MAY START TO LOSE
POWER OR STOP COMPLETELY. AT THIS POINT,
THERE MAY NOT BE SUFFIECIENT HOT AIR IN THE
ENGINE COMPARTMENT TO MELT THE
ACCUMULATION OF CARBURETOR ICE, EVEN
WHEN THE CARBURETOR HEAT CONTROL IS IN
THE FULL "HOT" POSITION.
In general, follow these practices:
When icing conditions exist, apply carburetor heat often
in all flight regimes. The main symptom of icing in the
induction system will be loss of power.
Never use partial carburetor heat. Partial heat could
make matters worse. Remember, full heat or nothing.
Be especially vigilant at lower power settings. It is good
practice to use carburetor heat during any descent where
you have reduced power, especially for landing.
In conditions conducive to icing or if ice was noted during
engine run-up, perform another carburetor heat check
