CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 4-16
Carburetor ice, as evidenced by an unexplained drop in RPM, can be removed by application of full
carburetor heat. Upon regaining the original RPM (with heat off), use the minimum amount of heat (by
trial and error) to prevent ice from forming. Since the heated air causes a richer mixture, readjust the
mixture setting when carburetor heat is to be used continuously in cruise flight.
The use of full carburetor heat is recommended during flight in very heavy rain to avoid the possibility of
engine stoppage due to excessive water ingestion. The mixture setting should be readjusted for
smoothest operation.
FUEL SAVINGS PROCEDURES FOR FLIGHT TRAINING OPERATIONS
For best fuel economy during flight training operations, the following procedures are recommended.
1. Use 55% to 60% power while transitioning to and from the practice area (approximately 2200-
2250 RPM).
2. Lean the mixture for maximum RPM during climbs above 3000 feet. The mixture may be left
leaned for practicing such maneuvers as stalls.
3. Lean the mixture for maximum RPM during all operations at any altitude, including those below
3000 feet, when using 75% or less power.
NOTE
When cruising at 75% or less power, the mixture may be further leaned
until the RPM peaks and drops 25-50 RPM. This is especially applicable
to cross-country training flights, but may also be practiced during
transition flights to and from the practice area.
Using the above recommended procedures can provide fuel savings of up to 13% when compared to
typical training operations at a full rich mixture.
STALLS
The stall characteristics are conventional for the flaps up and flaps down condition. The stall warning
horn produces a steady signal 5 to 10 knots before the actual stall is reached and remains on until the
airplane flight attitude is changed. Stall speeds for various combinations of flap setting and bank angle
are summarized in Section 5.
SPINS
Intentional spins are approved in this airplane (see Section 2). Before attempting to perform spins,
however, several items should be carefully considered to assure a safe flight. No spins should be
attempted without first having received dual instruction in both spin entries and spin recoveries from a
qualified instructor who is familiar with the spin characteristics of the Cessna 152.
The cabin should be clean and all loose equipment (including the microphone) should be stowed. For a
solo flight in which spins will be conducted, the copilot’s seat belt and shoulder harness should be
secured. Spins with baggage loadings or occupied child’s seat are not approved.
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