The Prop 1-16 Flashcards Preview

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Flashcards in The Prop 1-16 Deck (16)
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1
Q

What type is the prop?

A

aluminum 97-inch, fourbladed,

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

2
Q

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

A

2000 RPM

3
Q
What control the propeller
blade angle (pitch) and propeller speed (NP)?
A

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

4
Q

Because the

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

A

12,000 to 16,000 feet MSL

5
Q

At 100% indicated torque, the engine is producing

approximately ________ foot-pounds of torque at the prop shaft

A

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

6
Q

Propeller pitch may be defined by what three basic conditions?

A
  1. feathered
  2. low pitch (flat or fine)
  3. high pitch (coarse)
7
Q

When feathered, the propeller blades are aligned

nearly straight into the wind

A

True

8
Q

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

A

15°

9
Q

How does the PMU controls the propeller RPM?

A

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

10
Q

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

A

106%

11
Q

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

A

100±2%.

12
Q

Manual propellor governing is accomplished by

A

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

13
Q

In the event of an engine failure with the power control

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

A

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

14
Q

What are the two methods to feather the propeller.

A
  1. If the engine is shut down with the PCL and the PMU is in NORM.
  2. Placing the PCL to cutoff
15
Q

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

A

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

16
Q

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?

A

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