Cessna 152 Systems Overview Ground Study Guide

Practice flashcards covering the engine, fuel, electrical, and carburetor systems of the Cessna 152 (N89753) for pre-solo ground study.

What specific engine model powers N89753?

The Lycoming O-235-L2C.

What does the term 'normally aspirated' indicate about the aircraft's engine?

It has no turbo or supercharger and only produces the power allowed by the outside air pressure.

In the Cessna 152 direct-drive engine, what is the relationship between engine RPM and propeller RPM?

They are equal because the crankshaft connects straight to the propeller with no gearbox.

What is the rated horsepower and redline RPM of N89753?

$110\,\text{horsepower}$ at $2550\,\text{RPM}$.

What provides the spark for the engine ignition, allowing it to run even with a dead battery?

Two magnetos.

What are the two gauges used to monitor engine health during flight?

Oil pressure and oil temperature.

How is fuel fed from the wing tanks to the engine in the Cessna 152?

Through gravity alone (no fuel pump).

What is the total fuel capacity and the usable fuel capacity for N89753?

Total capacity is $26.0\,\text{gallons}$ and usable fuel is $24.5\,\text{gallons}$.

What amount of fuel is considered 'unusable' and cannot be safely used in any attitude?

$1.5\,\text{gallons}$.

Which fuel types and colors are approved for the Cessna 152?

$100\text{LL}$ (blue) or $100/130$ (green).

Does the Cessna 152 have a left/right fuel tank selector?

No, it has a single fuel shutoff valve (ON/OFF) that draws from both tanks simultaneously.

What are the specifications of the Cessna 152 electrical system?

A $28\text{-volt}$ system with a $60\text{-amp}$ engine-driven alternator and a $24\text{-amp-hour}$ battery.

What are the two functions of the split rocker Master switch?

The BAT side connects the battery to the main bus/starter, and the ALT side controls the alternator.

What does a small positive (charging) value on the ammeter indicate during normal cruise?

It indicates the alternator is keeping the battery charged.

How many reset attempts are allowed if the over-voltage sensor shuts the alternator off the bus?

One reset attempt by cycling the master switch.

What type of carburetor is mounted at the bottom of the N89753 engine?

A float-type, updraft carburetor with a fixed jet.

How much can the air temperature drop inside the carburetor venturi due to fuel vaporization?

$60\text{--}70^{\circ}\text{F}$.

What is the primary symptom of carburetor icing in an aircraft with a fixed-pitch propeller?

A gradual, unexplained drop in $\text{RPM}$.

From where does the carb heat control route its heated air?

From the exhaust shroud.

Why should the use of carb heat be avoided during ground operations except when necessary?

Because it pulls unfiltered air, bypassing the air filter.