Advanced Aircraft Systems - Complex and TAA

Question 1

What does a constant speed propeller do?

Answer 1

It is able to vary the pitch of the propeller to attempt to keep the engine running at a preset/constant speed.

Question 2

On a constant speed normally aspirated single-engine aircraft, where is the governor?

Answer 2

in front of the driveshaft and before the propeller

Question 3

What does the governor do?

Answer 3

attempts to keep engine at constant speed

Question 4

Governor hydraulically maintains the RPM of engine by doing what?

Answer 4

varying oil pressure into the piston in front of the propeller thereby changing the pitch of the propeller

Question 5

In addition to oil pressure, what mechanical object is needed to change the pitch of the propeller

Answer 5

flyweight - uses centrifugal force to open/close pilot valve

Question 6

What is a speeder spring?

Answer 6

Spring above the flyweight that controls amount of pressure on the pilot valve

Question 7

Pilot valve can do what 3 things?

Answer 7

1. add oil to the piston
2. keep oil in place
3. send oil back to engine

Question 8

What happens in constant speed propeller when nose is pushed down?

Answer 8

the flyweights swing out, opening the pilot valve, allowing more oil into the piston and that increases the pitch of the propeller

Question 9

What happens to the propeller in single-engine aircraft with constant speed propeller when oil pressure is lost?

Answer 9

The propeller goes flat / lower pitch (blade pointed up and down, not into the “wind”)

Question 10

In cruise, a constant speed propeller has what AoA?

Answer 10

Coarse pitch / higher pitch (blade pointed more into the “wind”)

Question 11

There is a lower propeller pitch for what type of airspeeds?

Answer 11

lower airspeeds = lower propeller pitch

Question 12

When the propeller lever is full forward, what happens to oil in the prop cylinder and what happens to the pitch of the blade?

Answer 12

Oil comes out of the cylinder with prop lever full forward

Pitch goes to flat / lower pitch

?Releases tension on the speeder spring

Question 13

When moving the propeller lever backward, what happens to the oil in the prop cylinder and what happens to the pitch of the blade?

Answer 13

Oil pushed into cylinder with prop lever full backward

Pitch goes to coarse / higher pitch

Question 14

High Pitch, then ____ airspeed

Low Pitch, then ____ airspeed

Answer 14

high

low

Question 15

What type of pitch creates more drag?

Answer 15

High pitch creates more drag and makes it harder for the engine to turn

Question 16

Flyweight’s force is counteracted by what?

Answer 16

speeder spring tension

Question 17

What happens when force of speeder spring and flyweights equalize?

Answer 17

flow of oil stops flowing to the prop hub/piston

Question 18

RPM lever moved by pilot directly changes what component?

Answer 18

speeder spring tension

Question 19

Pulling propeller lever back decreases tension on the speeder spring and causes what?

Answer 19

Opens pilot valve increasing oil pressure and increasing pitch of the blades causing more drag