Jeppesen Oral- Chapter 12 (Propellers) Flashcards
Fluid (alcohol) and electrical heat applied to the propeller blade root
Only minor repairs and alterations. MMM outlines the scope of repairs
With a brush or cloth and warm water with mild soap
The MMM
Procedures recommended by manufacturer
The extent of the bend and its blade station location
Fine sand paper
Vertical and horizontal
Measure proper blade angle
Propeller being out of track/balance and incorrect blade angle setting
Procedure that compares the position of propeller blade tips relative to each other.
Throttle
Creates thrust to pull or push aircraft through air
Fixed pitch only has one built in blade-angle and can’t be pilot controlled Variable pitch- Has a blade angle that can be changed by the propeller and is controlled with a governor that maintains constant speed
By metal tripping fastened to the leading edge of and tip
Blade angle increases to prevent overspeed
Boost engine oil pressure before entering propeller hub senses rotational speed of propeller, then adjust oil flow to the hub to change pitch
Centrifugal force acting on the weights causes the blade angle to increase
Governor is not accelerating or decelerating and the speeder spring and flyweight forces are in balance
Releasing oil pressure in the governor, counterweight and feathering spring move the propeller into feather. Happens automatically when governor oil pressure drops to zero (following engine failure) Or it can be manually done by the pilot but must be done quickly to reduce chance of windmilling and destroying the engine
Oil accumulator used to provide oil pressure to unfeather a propeller.
Alpha- normal operating range of propeller in flight ( course and fine pitch) Beta range- propeller operating in minimum, zero and reverse thrust. Used on ground
