Module 17 Easa Questions
EASA Canada Part-145 Approvals for guidance please refer to relevant web page.
Module 17 easa questions printable
These power pulses cause a propeller blade to vibrate and set up standing-wave patterns that cause metal fatigue and failure. The location and number of stress points change with different rpm settings. But the most critical location for these stress concentrations is approx. 6" from the tip of the blades. Most airframe/engine/propeller combinations have eliminated the adverse effects of these vibrational stresses by careful design. But some combinations are sensitive to certain propeller speeds. This critical range is indicated on the airspeed indicator by a red arc. The engine should not be operated in the critical range except as necessary to pass through it to set a higher or lower rpm. If the engine is operated in the critical range, a structural failure in the aircraft becomes possible because of the vibrational stresses set up. For training only (c) by Link & Learn Aviation Training GmbH 411 32 EASA Part-66 Training Handbook Module 17 LINK & LEARN Fabric sheathing Hub assembly Tip Figure 1 Typical Wooden Aircraft Propeller For training only
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Get familiar with the Jeppesen charts and feel confident during your official exams. Pilots working towards the EASA exams will need this manual. 79. 00 €
This tendency to decrease the blade angle is produced because all the parts of a rotating propeller try to move in the same plane of rotation as the blade's center line. At operational rpm, this force is greater than the aerodynamic twisting moment. It is used in some designs to decrease the blade angle. For training only (c) by Link & Learn Aviation Training GmbH 311 32 EASA Part-66 Training Handbook Module 17 LINK & LEARN Vibrational Force and Critical Range When a propeller produces thrust, aerodynamic and mechanical forces are present which cause the blade to vibrate. If this is not allowed for in the design, this vibration may cause excessive flexing and work-hardening of the metal and may even result in sections of the propeller blade breaking off in flight. Aerodynamic forces cause vibrations at the tip of a blade where the effects of transonic speeds cause buffeting and vibration. Mechanical vibrations are caused by the power pulses in a piston engine. They are considered to be more destructive in their effect than aerodynamic vibration.