McCauley Propeller ppt Flashcards
McCauley propeller’s components for pitch change mechanism are lubricated with _____ instead of engine oil.
grease
Some models of McCauley are greased with ____ ____ that is permanently sealed in the hub.
dyed oil
What indicates if the hub or blades has RED OIL appearance on the surface?
CRACK
Both series of MCcauley props are?
Non-feathering and Non-counterweighted
Oil pressure is used to increase propeller blade angle and centrifugal twisting force combines with an _____ _____ to rotate the blades to low pitch.
internal spring
With this type of system when a higher blade pitch is selected _____ _____ oil is routed to the propeller hub to push against the piston.
high pressure
The _____ directs high pressure oil to the propeller hub to increase the propeller blade angle.
governor
Most McCauley governors uses ____ _____ to adjust the speeder spring pressure that acts on the flyweights and pilot valve.
control arm
For safety purposes, the governor control lever is spring-loaded to the _____ ______ setting.
This way if the propeller control cable breaks the propeller blades automatically return to low pitch which permits the engine to develop its maximum power output
high speed
As another safety feature all McCauley governors incorporate a _____-_____ _______ to prevent the engine and propeller from over speeding
high-speed stop
How do you adjust the low speed and high speed stops for McCauley props?
adjust the setscrew on the governor head
Difference of hartzell constant speed propellers and Hamilton standard constant speed propeller?
HARTZELL = pitch change mechanism found inside the prop head.
HAMILTON = pitch change mechanism is exposed.
Hartzell compact propeller uses a combination of _____ _____ and _____ ______ acting on counterweights to increase the angle of the propeller blades and to FEATHER.
air pressure and centrifugal force
Hartzell props has a _____ ______ stored in the propeller hub (cylinder head) and a counterweight is mounted to the base of each propeller.
nitrogen discharge
Hartzell compact feathering propeller uses hi-pressure nitrogen discharge and a _____ _____ to INCREASE the blade angle and FEATHER the blades
mechanical spring
How did the TWO POSITION Hamilton Standard counterweight propeller transformed to Constant speed propeller system?
a FLYWEIGHT GOVERNOR was developed to replace the selector valve
The propeller used with the Hamilton-Standard constant-speed system is essentially the same counterweight propeller used as the two position propeller discussed earlier.
However because a counterweight propeller is used _____ _____ provides the force required to decrease blade angle while _____ ______ acting on the counterweights is used to increase the blade angle.
oil pressure, centrifugal force
______ eliminates the drag of a windmilling propeller by presenting the smallest blade profile to the oncoming airstream.
feathering
The _____ ______ lever in the cockpit typically incorporates an additional position to rotate the propeller blades to a FEATHERED POSITION.
propeller control lever
_______ propellers must be used on multi-engine aircraft to reduce propeller drag to a minimum under one or more engine failure condition
Feathering
Almost all small feathering propellers use ____ _____ to take the propeller to low (fine) pitch and blade ______ ______ and compressed air to take the blades to high (coarse) pitch.
oil pressure, counterweights springs
Since the blades would go to the feather position during shutdown, the _____ lock the propeller in the LOW PITCH position.
latches
What happens with the latches in flight?
prevents the blades from feathering, because they are held off their seat by centrifugal force.
If the blades were in the feathered position during engine start the engine would be placed under an ______ load during a time when the engine is already subject to wear.
inappropriate
On most aircraft, feathering functions are ______ of constant-speed operation.
The operator can override a constant-speed system to feather the propeller at anytime.
The operator can bring the propeller out of feather and back online at anytime.
independent
The ability of the propeller to go into feather relies on the _____ to override the normal operating range
When the pilot selects the propeller to feather the ______ overrides the speeder spring and flyweights
This action lifts the pilot valve to the feather position and allows all of the oil to drain from the hub and into the engine sump.
governor, governor
One method to take the propeller OUT of the feather position the pilot moves the propeller control to ____ _____ (high rpm) and turns the engine over with the _____ until oil pressure builds up enough to take the propeller out of feather and start the engine .
low pitch, starter
For the UNFEATHERING accumulator option, the governor is equipped with an _____ ______ oil port and a _____ ______ ______.
high pressure oil port, control check valve
When the propeller is in _____ flight configuration, high pressure oil flows from the governor boost pump past the check valve to fill the accumulator.
normal
When the pilot moves the propeller control to ______ the check valve control is moved off and the check valve and is seated trapping the oil under pressure in the accumulator.
feather
When the propeller control is moved to the ____ _____ (high rpm) the check valve control is moved onto the check valve and oil under pressure is allowed to flow to the propeller hub to move the propeller blades out of feather and into low pitch to allow the engine to start.
low pitch
