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Engine Cooling
Engine cooling system FAA written questions
| Question | Answer |
|---|---|
| The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to | force cooling air into close contact with all parts of the cylinders |
| What is the purpose of an augmenter used in some reciprocating engine exhaust systems? | to aid in cooling the engine |
| Cracks in cooling fins that do not extend into the cylinder head, may be repaired by | removing the affected area and contour filing within limits |
| Which of the following should a mechanic consult to determine the maximum amount of cylinder cooling fin that could be removed when cracks are found? | engine manufacturer’s service or overhaul manual |
| A bent cooling fin on an aluminum cylinder head | should be left alone if no crack has formed |
| Where are cooling fins usually located on air-cooled engines? | cylinder head, cylinder barrel, and inside the piston head |
| How do cowl flaps aid in cooling a horizontally opposed aircraft engine? | controls the amount of air flowing around the cylinders |
| The position of cowl flaps during normal cruise flight conditions is | closed |
| Generally, a small crack just started in a cylinder baffle | may be stop drilled |
| Which of he following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly? | a baffle and cowl arrangement |
| During ground operation of an engine, the cowl flaps should be in what position? | fully open |
| During an operational check of an electrically powered radial engine cowl flap system, the motor fails to operate. Which of the following is the first to be checked? | Flap actuator motor circuit breaker |
| (1) Some aircraft exhaust systems include an augmenter system to draw additional air over the engine for cooling. (2) Augmenter systems are used to create a low pressure area at the lower rear of the aircraft engine cowling. | both No.1 and No.2 are true. |
| Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder? | too much cooling fin broken off |
| What part of an air-cooled cylinder assembly has the greatest fin area per square inch? | Exhaust valve port |
| Reciprocating engines used in helicopters are cooled by | a fan mounted on the engine |
| The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is | carried out with the exhaust gases |
| A broken cooling fin on a cylinder head | may be filed to smooth contours if damage and/or repair limits are not exceeded |
| Cylinder head temperatures are measured by means of an indicator and a | thermocouple sensing drive |
| Prolonged idling of an engine will usually result in | foreign material buildup on spark plugs |
| The most common method and generally the best conduction of heat from the inside of a cylinder barrel to the cooling air is accomplished by | machining fins directly on the outside of the barrel |
| What is the function of a blast tube as found on aircraft engines? | a device to cool an engine accessory |
| What is the position of the cowl flaps during engine starting and warm-up operations under normal conditions? | full open at all times |
| Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of | cooling |
| The active clearance control (ACC) portion of the EEC system aids turbine engine efficiency by | ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures |
| Which statement is true regarding the air passing through the combustion section of a jet engine | most is used for engine cooling |
| How are combustion liner walls cooled in a gas turbine engine? | by secondary air flowing through the combustion chamber |
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