A propeller is one of the most highly stressed components on an aircraft. During normal operation, 10 to 20 tons of centrifugal force is acting to pull the blades from the hub. Therefore it is essential to have your propeller overhauled at the recommended scheduled periods. The blades are routinely subjected to bending, flexing, and vibratory forces. The propeller hub is also put under enormous stress.
During a scheduled propeller overhaul the blades are measured to make sure they are above the manufacturer’s minimum dimensions. The propeller is then stripped and cleaned. All components are then visually inspected by our experienced technicians. Aluminum components including the hub and blades undergo Liquid Penetrant Inspection to determine if there are any signs of fatigue cracks or stress raisers. Steel components are subjected to Magnetic Particle Inspection for the same reason.
On occasions some components may require additional repairs such as machining or shot peening, a process in which steel shot is blasted into a part to produce a compressive residual stress layer to increase its strength and durability. To help prevent corrosion from the elements steel parts are cad-plated and aluminum parts undergo chemical conversion.
Propeller components such as the hub and blades are then painted and the propeller is then reassembled using new seals, screws, bolts and washers as required by the manufacturer. Following this the propeller assembly undergoes a series of checks including a function check and blade angle check. The propeller is then statically balanced and ready for fitment back on the aircraft.
Due to our experienced, trained personnel, extensive workshop facilities and precise calibrated equipment you can be assured that your propeller is in good hands at Southern Propeller Services.
The photos above are further shots of our high quality Adelaide workshop and professional staff.