EASA Part-66 Module17 propeller foundations flashcards
EASA Part-66 Module17 propeller foundations · Build recall with a focused review session.
20 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Blade angle
- The angle between a stated blade-section chord and the plane of rotation, distinguished from its aerodynamic angle relative to the local airflow.
- Effective pitch
- The actual forward advance per revolution at the stated operating condition, distinguished from the geometric screw-advance model of the blade.
- Slip
- The difference between geometric and effective advance per revolution in the defined comparison, requiring a stated denominator when expressed as a percentage.
- Blade station
- A specified measurement location relative to the propeller reference, used to make geometry and inspection results repeatable under the applicable data.
- Thrust power
- Useful propulsive output calculated from thrust multiplied by forward speed in a consistent model, distinguished from the engine shaft input power.
- On-speed condition
- A state where the actual rotational speed matches the selected governor setting within the system behavior, distinguished from a fixed universal blade angle.
- Overspeed condition
- Actual rotational speed above the selected or specified reference, whose correction and limits depend on the actual governor and installation.
- Speeder spring
- The governor element providing the selected reference force against the speed-sensitive mechanism, rather than a direct measurement of aircraft forward speed.
- Feathering
- Moving blades toward the defined low-drag alignment with axial airflow, using the actual control forces and angle references of the installation.
- Double-acting control
- A pitch-change arrangement using hydraulic action in both movement directions, distinguished from a single hydraulic direction opposed by other forces.
- Synchronization
- Matching propeller rotational speeds in the defined control arrangement, distinguished from independently establishing blade phase, track or structural condition.
- Synchrophasing
- Controlling a specified relative angular blade relationship in addition to speed, with permitted operation and authority determined by the actual system.
- Slip ring
- A rotating electrical contact surface used with the specified brush arrangement to transfer electrical power or signals across the rotating interface.
- Heating sequence
- The controller-defined order and timing of electrical element operation, assessed against the actual system rather than an assumed universal cycle.
- Slinger arrangement
- A rotating distribution method using centrifugal action to direct the specified fluid along the intended delivery paths rather than a generic fuel-supply function.
- Blade tracking
- Checking blade-tip paths against the specified reference and tolerance, distinct from verifying mass balance or dynamic vibration on the engine.
- Static balance
- Assessment of mass distribution in the defined stationary test arrangement, not proof of all rotating aerodynamic or engine-coupled vibration behavior.
- Dynamic balance
- Assessment of rotating vibration using the specified measurement and correction procedure, with allowed weights and locations defined by the applicable data.
- Stress concentration
- A localized increase in stress associated with geometry or damage, whose reduction does not alone establish that a crack or reduced section is acceptable.
- Preservation
- The specified protection, packaging, support and environmental control for storage, requiring actual material and interval instructions rather than appearance alone.