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DA42 TECHNICAL KNOWLEDGE > Powerplant > Flashcards

Powerplant Flashcards

1
Q

How many cylinders are in each engine

A

4 cylinders

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2
Q

Type of cooling

A

Liquid

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3
Q

Engine name

A

Thielert TAE 125

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4
Q

Petrol or diesel

A

4 stroke diesel

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5
Q

How is combustion achieved in a Diesel engine

A

Much higher compression ratio than a petrol engine causes spontaneous combustion due to such high pressure and heat

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6
Q

How are diesel cylinders heated for a cold start

A

Glow plug in each cylinder to preheat

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7
Q

What lubrication system does the engine utilise

A

Wet sump with external filter and oil cooler

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8
Q

From where does the engine and turbocharger get the oil for lubrication

A

Engine driven pump

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9
Q

Lubrication system capacity

A

6 litres

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10
Q

Approved oils for engine lubrication

A

Shell helix ultra synthetic

Aeroshell diesel oil

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11
Q

Approved oil for gearbox lubrication

A

Shell EP API oil

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12
Q

Maximum hourly oil consumption

A

0.1 litre

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13
Q

When will L/R OIL TEMP appear

A

Engine oil temperature exceeds 140 deg C

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14
Q

When will L/R OIL PRES appear

A

If engine oil pressure is below 1.2 bar

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15
Q

When will L/R GBOX TEMP appear

A

Engine gearbox temperature exceeds 120 deg C

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16
Q

Engine fuel injection system flowchart

A 
Wing tanks
-through filter at back of engine nacelle
Engine driven low pressure pump
Engine high pressure pump
Common fuel rail
-during induction stroke
 Cylinder
17
Q

How is pressure controlled in the common fuel rail

A

Combined regulator and pressure relief valve

18
Q

What happens to excess fuel in the common fuel rail

A

Returns to fuel system via a fuel cooler

19
Q

What mixture is the DA42 coolant liquid

A

Water and antifreeze

20
Q

What pumps the liquid of the DA42 coolant system

A

Belt driven integral pump

21
Q

What is the difference between the main and bypass circuits of the coolant system

A

Main: has heat exchanger and thermostatic valve
Bypass: feeds liquid straight back to pump inlet

22
Q

When would coolant be passed through the bypass circuit rather than the main circuit

A

If it is still cool and does not need to pass through the heat exchanger

23
Q

How is the coolant system protected against overpressure

A

There is an overflow tank fitted with a pressure relief valve, and a pipe that can drain excess coolant out from the bottom of the engine nacelle

24
Q

How do you physically check coolant levels

A

Engine cowling must be removed

25
Q

When would L/R ENG TEMP appear

A

If engine coolant temperature exceeds 105 deg C

26
Q

When would L/R COOL LVL appear

A

When engine coolant level is low

27
Q

From where are exhaust gases collected for the turbocharger

A

Cylinder outlets

28
Q

Where do exhaust gases get fed as part of the turbocharger system

A

The turbine

29
Q

What drives the compressor in the turbocharger system

A

The turbine

30
Q

What controls the amount of exhaust gases being fed to the turbocharger system, and by what method

A

The ECU controls it, by opening or closing a waste gate valve.

31
Q

How does the system calculate how much to open the waste gate valve in the turbocharger system

A

A manifold pressure sensor behind the compressor

32
Q

What does the waste gate controlling the volume of exhaust gases to the turbocharger prevent

A

Excessive manifold pressure at low density altitudes

33
Q

What is the function of the compressor in the turbocharger system

A

To compress inlet air before it goes to the engine

34
Q

How is compressed air further “powered” before reaching the engine

A

Passes through an intercooler, which cools and increases efficiency by increasing the density of the air

DA42 TECHNICAL KNOWLEDGE (14 decks)

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