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Recip Engines
O&P(P)
| Question | Answer |
|---|---|
| What are the basic types or configurations of recip engines | In-line, opposed, v-type, radial |
| In what position should the crankshaft be when a magneto is being timed to the engine? | When the crankshaft is 30 degrees before top dead center on the compression stoke in cylinder 1 |
| What is checked on a engine runup to determine operational condition of the engine? | Idling RPM and manifold pressure, engine acceleration, maximum static RPM and manifold pressure, magneto drop, ignition switch safety check, propeller pitch change, propeller feathering, oil pressure, fuel pressure and fuel flow |
| What is hydraulic lock | Oil has drained past the piston rings and filled the combustion chamber of cylinders below the center line. If crankshaft is turned over with oil like this the cylinder can lock causing damage to the cylinder, piston or connecting rod. |
| How is hydraulic lock removed | Remove a spark plug from a locked cylinder and drain all oil. Clean the spark plug and replace it |
| What are the strokes of a 4-stroke engine | Intake, compression, power, and exhaust |
| What is a low tension ignition system? | It is an ignition system using a magneto with a brush-type distributor and a coil that has no secondary winding. Low voltage is directed from the magneto to a transformer mounter on the cylinder head. Here the low voltage is boosted to a high voltage and |
| What are some advantages of a horizontally opposed engine? | Low power-to-weight ratio. ideal for installation on aircraft wings, and low vibration characteristics |
| How can you determine the firing order of an 18 cylinder radial engine | Begin with cylinder 1, and add 11 or subtract 7, whichever will keep you between the numbers 1 and 18 |
| What is a floating cam ring on a large radial engine | It is a cam ring that rides on a shelf-type bearing with a large amount of clearance between the bearing and the ring. When adjusting the valves on an engine with a floating cam ring, the pressure of the valve spring on the opposite side of the engien mus |
| Why is valve clearance adjusted on radial engines, but not on most horizontally opposed engines | Most horizontally opposed engine have hydraulic valve lifters that keep all of the clearance out of the valve train. Radial engines have solid lifters |
| Why are both hot and cold valve clearances given for most radial engines | The hot clearance is given for valve timing purposes. When the timing is set, all of the valves are adjusted to their cold clearance |
| Why is it important to preserve engines that will not be operated for an extended period of time. | Moisture will accumulate in the engine, initiating corrosion process |
| Preservation for temporary storage is valid for engines that will be out of services for how many days | 30 to 90 days |
| What should be done to the cylinder to protect them from rust and corrosion when preparing the engine for long time storage | Spray a preservative oil inside the cylinders and replace the spark plugs with desiccant plugs |
| What is the formula for calculating indicated horsepower on a 4 stroke engine | Indicated horsepower= (PLANK)/ 33,000 P-Indicated mean effective pressure, in psi L- Length in stroke, in feet or in fractions of a foot A- Area of the piston head or crass-sectional area of the cylinder, in square inches N- Number of power strokes pe |
| What is specific fuel consumption (SFC) | SFC is a measure of the economic use of fuel, which is the fuel weight in pounds per hour per horsepower SFC= (pounds fuel/hour) divided by horsepower |
| What must be inspected to determine the airworthiness of an engine installation | The propeller, lubrication system, ignition system, fuel metering system, cooling system, and the exhaust system |
| Where can you find the correct grade of fuel and amount of engine lubricating oil for an aircraft engine | Type Certificate Data Sheet for the aircraft |
| What are the basic steps in troubleshooting an engine installation | Know how the system should operate Observe how the system is operating Divide the system into smaller parts to find the trouble Look for the obvious problems first |
| Where do you find instructions for removing an engine from an aircraft | Aircraft maintenance manual |
| What must normally be done to a nose-wheel airplane before removing an engine | The tail of the airplane must be supported |
| What should be used to cover the ends of fuel and oil lines that have been disconnected from the engine | Plugs and caps |
| What is meant by a QEC engine assembly | An engine that has been prepared for a quick engine change. all that is needed is for the controls, wiring, and fluid lines to be connected to the firewall |
| What is meant by rigging the engine controls so they have a cushion | The control on the engine component must contact its stop before the control handle in the flight deck reaches its stop. |
| What are two ways to pre-oiling an engine | -Before the spark plugs are installed and after the oil tank or sump is filled, turn the engine over with the starter until oil runs out of the fitting to which the oil pressure gauge connects. -Use a pre-oiler tank. Air pressure forces oil through all |
| What checks should be made to determine the proper operation of a recip engine installation | Idle RPM and mixture, static RPM, propeller pitch change operation, magneto check, ignition switch safety check, and carburetor heat check |
| What is the purpose of a cold cylinder check | A cold cylinder check determines which cylinder is not firing. Run the engine for a few minutes at the speed, and on the magneto, at which it runs roughest. Shut it down and feel the exhaust stack near the cylinder head. The cylinder which stack is not as |
| How is fuel ignited in a diesel cycle engine | The diesel cycle depends on high compression pressures to provide for the ignition of the air-fuel charge in the cylinder |
| What are two main causes of a cylinder having low compression? | Piston rings not seating or broken, and valves not seating or burned |
Created by:
tbarth
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