Powerplant

Question 1

How many cylinders are in each engine

Answer 1

4 cylinders

Question 2

Type of cooling

Answer 2

Liquid

Question 3

Engine name

Answer 3

Thielert TAE 125

Question 4

Petrol or diesel

Answer 4

4 stroke diesel

Question 5

How is combustion achieved in a Diesel engine

Answer 5

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

Question 6

How are diesel cylinders heated for a cold start

Answer 6

Glow plug in each cylinder to preheat

Question 7

What lubrication system does the engine utilise

Answer 7

Wet sump with external filter and oil cooler

Question 8

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

Answer 8

Engine driven pump

Question 9

Lubrication system capacity

Answer 9

6 litres

Question 10

Approved oils for engine lubrication

Answer 10

Shell helix ultra synthetic

Aeroshell diesel oil

Question 11

Approved oil for gearbox lubrication

Answer 11

Shell EP API oil

Question 12

Maximum hourly oil consumption

Answer 12

0.1 litre

Question 13

When will L/R OIL TEMP appear

Answer 13

Engine oil temperature exceeds 140 deg C

Question 14

When will L/R OIL PRES appear

Answer 14

If engine oil pressure is below 1.2 bar

Question 15

When will L/R GBOX TEMP appear

Answer 15

Engine gearbox temperature exceeds 120 deg C

Question 16

Engine fuel injection system flowchart

Answer 16

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

Question 17

How is pressure controlled in the common fuel rail

Answer 17

Combined regulator and pressure relief valve

Question 18

What happens to excess fuel in the common fuel rail

Answer 18

Returns to fuel system via a fuel cooler

Question 19

What mixture is the DA42 coolant liquid

Answer 19

Water and antifreeze

Question 20

What pumps the liquid of the DA42 coolant system

Answer 20

Belt driven integral pump

Question 21

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

Answer 21

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

Question 22

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

Answer 22

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

Question 23

How is the coolant system protected against overpressure

Answer 23

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

Question 24

How do you physically check coolant levels

Answer 24

Engine cowling must be removed

Question 25

When would L/R ENG TEMP appear

Answer 25

If engine coolant temperature exceeds 105 deg C

Question 26

When would L/R COOL LVL appear

Answer 26

When engine coolant level is low

Question 27

From where are exhaust gases collected for the turbocharger

Answer 27

Cylinder outlets

Question 28

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

Answer 28

The turbine

Question 29

What drives the compressor in the turbocharger system

Answer 29

The turbine

Question 30

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

Answer 30

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

Question 31

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

Answer 31

A manifold pressure sensor behind the compressor

Question 32

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

Answer 32

Excessive manifold pressure at low density altitudes

Question 33

What is the function of the compressor in the turbocharger system

Answer 33

To compress inlet air before it goes to the engine

Question 34

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

Answer 34

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