When a rotor blade is loaded by air, the lift generated along the blade acts to twist the blade around its axis. Because the outer portions move faster and produce more lift, the torque from these forces tends to rotate the blade toward a higher pitch angle. In other words, the aerodynamic twisting moment pushes the blade toward a larger blade angle (higher pitch) rather than toward a mid, low, or fully feathered position. Blades are designed with a pre-twist and are pitch-controlled to balance this tendency so the angle of attack stays appropriate along the span under operating loads.

Feathering a propeller is about turning the blades to a high pitch to minimize drag when the engine isn’t driving them. If the propeller is in the HIGH RPM position, the blades start at a relatively low pitch to allow the engine to reach or maintain high speed. When feathering begins, the mechanism increases the blade angle, moving first into a higher pitch range and then all the way to the feather position. So the movement is from low pitch, through high pitch, to feather.

Annual inspections have a fixed 12-month window from the date of the last inspection and cannot be extended. If the due date passes, the aircraft is not airworthy for normal operations and cannot be flown until the inspection is completed. The only related option is to use a special flight permit or ferry flight to reposition the aircraft to a facility that can perform the inspection, but that does not extend the due date itself. So, there is no allowed extension of the annual inspection interval.

Placards or data plates carry essential, permanent information directly on the component. They identify the exact part with a part/serial number and specify the limits, operating instructions, and safety warnings that must be followed. This allows technicians to verify you’re using the correct part, ensure it’s operated within approved parameters, and perform the proper procedures for installation and maintenance. The safety warnings help prevent hazardous mistakes and support regulatory compliance. Color identification, storing maintenance logs, or indicating installation date aren’t the function of the data plate, which is focused on providing the critical data needed for correct identification, safe use, and traceability.

Static discharge wicks provide a controlled path for electrical charges to leave the airplane and enter the surrounding air, which keeps the aircraft from building up excess static electricity. As the aircraft flies, friction with air and precipitation causes static charges to accumulate on the skin. If unmanaged, this can create radio frequency interference and degrade the performance of antennas and navigation equipment. The wicks, usually placed on trailing edges, extend the conductive path to the atmosphere and allow a small corona discharge to occur, gradually bleeding off the charge so radio systems stay cleaner and more reliable. They do not aim to attract lightning or to increase interference; in fact, they help minimize radio disturbance caused by static. They also don’t affect the color of the aircraft skin. Their purpose is specifically to discharge static electricity safely into the air, maintaining better communication and navigation performance during flight.