The Prop 1-16

Question 1

What type is the prop?

Answer 1

aluminum 97-inch, fourbladed,

constant-speed, variable-pitch, non-reversing, feathering propeller

Question 2

The propeller system is designed to maintain a constant speed of __________ (100% NP) during most flight conditions.

Answer 2

2000 RPM

Question 3

What control the propeller
blade angle (pitch) and propeller speed (NP)?

Answer 3

The engine power management unit (PMU) and the propeller interface unit (PIU)

Question 4

Because the

engine is flat rated, 100% torque is available from sea level to approximately _________________ on a standard day.

Answer 4

12,000 to 16,000 feet MSL

Question 5

At 100% indicated torque, the engine is producing

approximately ________ foot-pounds of torque at the prop shaft

Answer 5

2900 (This equates to approximately 2750 pounds of thrust at sea level, zero airspeed.)

Question 6

Propeller pitch may be defined by what three basic conditions?

Answer 6

1. feathered
2. low pitch (flat or fine)
3. high pitch (coarse)

Question 7

When feathered, the propeller blades are aligned

nearly straight into the wind

Answer 7

True

Question 8

When in low pitch, the propeller blade angle is approximately _____ from the reference plane.

Answer 8

15°

Question 9

How does the PMU controls the propeller RPM?

Answer 9

by varying the propeller blade angle with oil pressure through
the PIU.

Question 10

With the PMU functioning, the mechanical overspeed governor modulates
oil pressure to the propeller pitch change piston to limit NP
below ______,

Answer 10

106%

Question 11

If PMU function is lost or deactivated, the overspeed governor modulates oil pressure to maintain NP at or below _______

Answer 11

100±2%.

Question 12

Manual propellor governing is accomplished by

Answer 12

centrifugal force moving the counterweights outward causing oil pressure to dump.

Question 13

In the event of an engine failure with the power control

lever (PCL) out of the cutoff position, what will happen with the propeller?

Answer 13

It will slowly begin to move toward feather due to the loss of oil pressure, but may not fully feather.

Question 14

What are the two methods to feather the propeller.

Answer 14

1. If the engine is shut down with the PCL and the PMU is in NORM.
2. Placing the PCL to cutoff

Question 15

What happens if the PCL is placed in cutoff with the PMU in OFF and the PROP SYS circuit breaker pulled?

Answer 15

the propeller will not rapidly feather and may not fully feather until after landing

Question 16

If the rate of change of propeller RPM, due to, for example, a rapid feathering of the propeller, exceeds the PMU sensor validity check limit, what will happen?

Answer 16

It will switch the PMU to manual mode, and dashes will be displayed for the RPM and torque values.