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Propellers test 2
| Question | Answer |
|---|---|
| How are the blades of a ground-adjustable propeller retained in the hub? | Clamps or bolts |
| What devices are used to hold the hub halves together if steel blades are used? | Bolts |
| Which devices must be loosened before the blade angles can be adjusted? | The retaining bolts or clamps |
| What types of pencil may be used to mark the hub and blades? | Red lead, white lead, or grease pencil |
| If the blade angles are being adjusted with the propeller on the aircraft, why may the angles have to be adjusted two or more times? | The blade angle may change during tightening process since the blades tend to hang down when the hub halves are loosened. |
| What is an acceptable difference in blade angle between the blades? | 0.1 degrees |
| Which areas of the hub should be inspected with dye penetrant? | The shank where the metal sleeve is used on wood, retention shoulders, grooves, and the hub. |
| When should the prop be overhauled? | At each engine overhaul or as specified by the manufacturer |
| Name 2 forces that will cause an increase in blade angle on an Aeromatic propeller | High airspeed and moderate power settings |
| What 2 factors influence blade angle of attack? | Natural forces acting on the blade and the counterweights |
| As the aircraft transitions from climb to cruise with the same throttle setting, will blade angle increase or decrease? | Increase |
| What is the purpose of the segmented synchronizer gear? | Meshes with gears on the butt of each blade so that each blade turns the same amount during operation. |
| What temporary repair may be made for a small crack in the plastic coating? | Apply 2 coats of clear nitrate dope to the area, allowing one hour of drying time between coats. |
| What would be the result if the prop were serviced with too much oil? | Erratic or sluggish operation |
| What preparations are necessary before placing the prop in storage? | The hub should be completely filled with oil and placed in a horizontal position |
| If the operational RPM is too high, are weights added to or removed from the counterweights? | added |
| Why must the prop spinner be installed when flight testing the prop for RPM adjustment? | The prop may have slightly different counterweight and aerodynamic action depending on whether the spinner is installed or not |
| What should be done with the prop if the track is out by more than 1/8 inch? | overhaul |
| What type of cockpit control is used to operate a Beech-Roby prop? | Crank handle mounted on the instrument panel. |
| How is the blade angle range adjusted on this prop? | Changes through the connection between the arm and actuating pin |
| What operational condition would indicate a need to replace the control cable? | Bending or catching |
| What is used to lubricate the gears of the pinion gear and drive gear? | Gears shouldn't be lubricated |
| What is the purpose for applying a lubricant to the crankshaft flange before installing the prop? | Prevent corrosion and allow easy removal of prop |
| Why is the 10 o'clock / 4 o'clock position suggested when installing a prop on a 4-cylinder horizontally opposed engine? | Reduces vibration in many instances and puts the prop in position for hand propping the airplane |
| When checking for proper seating with Prussian Blue, what is the minimum amount on contact? | 70% |
| What is the max. amount of penetration with a go no-go gauge? | 0.002 inches |
| What is the rear cone bottoming? | When the apex of rear cone contacts the land on the rear seat of the hub before the hub can seat on the rear cone |
| How is rear cone bottoming corrected? | By removing up to 1/16 inches from apex of the cone |
| What is front cone bottoming | When the front cone bottoms on the splines of the crankshaft before contacting the seat on the hub. |
| How is front cone bottoming corrected? | By placing a spacer of no more than 1/8 inch thickness behind rear cone |
| What is the maximum allowable out-of-track for a light aircraft metal prop? | 1/16 of an inch |
| How may the prop track be corrected? | Shims |
| What device is used to safety a splined-shaft installation? | Clevis pin is installed through the safety holes in the retaining nut and crankshaft, pin head should be positioned toward center of crankshaft. Washer is placed over pin and a cotter pin is installed |
| What is the most likely cause of vibration associated with a wood prop that has been in storage for a period of time? | Moisture may be concentrated in one blade causing the prop to be out of balance. |
| What is the purpose of the prop hub? | Helps transfer power from the crankshaft to the prop |
| What is the purpose of the snap ring in a tapered-shaft installation? | Secure it |
Created by:
mattpayne001