What is the function of

a blast tube as found on 

aircraft engines?

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A device to cool

an engine accessory.

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What part of an air cooled

cylinder assembly has

the greatest fin area

per square inch?

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Exhaust valve port.

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A bent cooling fin

on an aluminum

cylinder head

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should be left alone

if no crack has formed.

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Which of the following

results in a decrease

in volumetric efficiency?

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Part throttle operation.

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The primary purpose

of baffles and deflectors

installed around cylinders

of air-cooled aircraft

engines is to

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force cooling air into

close contact with

all parts of the cylinders.

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The purpose of an intercooler

when used with a turbocharger

is to cool the

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air entering the

carburetor from

the turbocharger.

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An engine becomes overheated

due to excessive taxiing

or improper ground

run-up. Prior to shutdown,

operation must continue

until cylinders have cooled,

by running engine at

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idle RPM.

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Which of the following

assists in removing heat

from the metal walls

and fins of an air-cooled

cylinder assembly?

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A baffle and cowl

arrangement.

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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?

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Engine manufacturer’s

service or overhaul manual.

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What is the position of

the cowl flaps during

engine starting and warm-up

operations under

normal conditions?

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Full open at

all times.

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Which statement is true

regarding the air passing

through the combustion

section of a jet engine?

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Most is used

for engine cooling.

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Reciprocating engines

used in helicopters are

cooled by

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a fan mounted

on the engine.

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Increased engine heat

will cause volumetric

efficiency to

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decrease.

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Augmenter tubes are

part of which

reciprocating

engine system?

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Exhaust.

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The position of the

cowl flaps during

normal cruise flight

conditions is

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closed.

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Which of the following

defects would likely

cause a hot spot on a

reciprocating engine cylinder?

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Too much cooling fin

area broken off.

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Where are cooling fins

usually located on air

cooled engines”

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Cylinder head,

cylinder barrel,

and inside the piston.

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Engine using

cold stream, or both

cold and hot stream

reversing systems include

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high bypass

turbofans. 

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Prolonged idling

of an engine will

usually result in

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foreign material

build up on spark plugs.

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A broken cooling fin

on a cylinder head

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may be filed to smooth

contours if damage

and /or repair limits

are not exceeded.

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What is the purpose

of an augmenter used

in some reciprocating

engine exhaust systems?

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To aid in

cooling the engine.

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Cylinder head

temperatures are m

easured by means

of an indicator and a

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thermocouple

sensing device.

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During ground

operation of an

engine, the cowl flaps should

be in what position?

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Fully opened.

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How do cowl

flaps aid in cooling a

horizontally opposed

aircraft engine?

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Controls the amount

of air flowing around

the cylinders.

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The component(s)

in a turbine engine

that operate(s) at

the highest temperatures

is/are the

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first stage turbine

nozzle guide vanes.

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The greatest portion

of heat generated by

combustion in typical

aircraft reciprocating

engine is

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carried out with

the exhaust gases.

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During an operational

check of an electrically

powered aircraft

engine cowl flap

system, the motor

fails to operate.  

Which of the following

is the first to be checked?

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Flap actuator

motor circuit breaker.

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High cylinder head

temperatures are

likely to result from

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a very lean mixture

at high power settings.

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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

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machining fins directly

on the outside of the barrel.

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Aircraft reciprocating

engine cylinder baffles

and deflectors should be

repaired as required to

prevent loss of

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cooling.

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Generally, a small

crack just stared in

a cylinder baffle

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may be stop drilled.

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Cracks in cooling fins

that do not extend into

the cylinder head may

be repaired by

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removing affected

area and contour

filing within limits.

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 1.       Some aircraft exhaust

systems include an augmenter

system to draw additional air over

the engine for cooling.

    2.        Augmenter system that

are used to create low pressure

are at the lower rear of the

aircraft engine cowling.

Regarding the above statements,

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both No. 1 and

NO.2 are true

SA

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The undersides of

pistons are frequently

finned. The principle reason is to

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provide for greater heat

transfer to the engine oil.

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