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Terms in this set (21)
Aluminum 97" four bladed, constant speed, variable pitch, non reversing, feathering propeller, through the reduction gear box.
The power turbine drives the?
2000 RPM (100% Np) during most flight conditions.
The propeller system is designed to maintain a constant speed of?
The engine power management unit (PMU) and the propeller interface unit (PIU).
Which systems automatically control the propeller blade angle (pitch) and propeller speed (Np)?
12,000 to 16,000 feet MSL on a standard day.
Because the engine is flat rated, 100% torque is available from sea level to approx?
2900 foot pounds of torque at the prop shaft. This equates to approximately 2750 pounds of thrust at sea level, zero airspeed.
At a 100% indicated torque the engine is producing approximately?
feathered, low pitch (flat or fine), and high pitch (course)
Propeller pitch may be defined by three basic conditions?
angle between the plane of rotation of the propeller and the chord line of the blade.
Each pitch condition is the measure of the?
nearly straight into the wind.
When feathered, the propeller blades are aligned?
15 degrees from the reference plane.
When in low pitch the propeller blade is approximately?
The propeller blades will be at (blank) pitch at low speeds and low throttle settings?
feather and low
High pitch is variable between (blank) and (blank) pitch to maintain Np at a constant 2000 RPM for the given condition?
propeller RPM, PIU.
The PMU controls the (blank) by varying the propeller blade angle with oil pressure through the (blank)
begine to move toward feather due to the loss of oil pressure, but may not fully feather.
In the event of an engine failure with the power control lever out of the cutoff position, the propeller will slowly?
If the engine is shut down with the PCL and the PMU is in NORM, the PMU sends a signal to the prop servo valve to drain propeller oil pressure. Placing the PCL to cutoff, activates microswitches that power the feather dump solenoid valve which also dumps oil pressure from the propeller.
What are the two methods to feather the propeller?
Prop servo valve
If the PMU is in OFF, it will not send a signal to the?
the prop feather dump solenoid will not be powered.
If the PROP SYS circuit breaker is pulled?
The propeller will not rapidly feather and may not fully feather until after landing.
If the PCL is placed in cutoff with the PMU in off and the PROP SYS circuit break pulled..?
the phase shift torque probe in the RGB (monitored by the PMU)
NP is measured by what?
A mechanical over speed governor limits RPM to?
The governor resets to maintain 100 +-2%
If 106% Np is reached what happens?
Above what altitude will a decrease in max torque available be noticed?
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