15.21 OPERATION AND MONITORING👌🏼

Question 1

As engine speed increases what happens to fuel

Answer 1

Increased fuel supply

Question 2

Where should the aircraft be positioned

Answer 2

Into the wind

Question 3

The aircraft must be clear up to what distance

Answer 3

10 metres

Question 4

Electrical power must be applied as well as external ground air which is what in psi

Answer 4

40-55psi

Question 5

Fuel should only be introduced when

Answer 5

Correct engine speed reached

Question 6

Why should EGT be monitored during engine run

Answer 6

• to ensure maximum start temperature is not exceeded

Question 7

Why should engine power not be increased above idle more than absolute necessary

Answer 7

-operational life is shorter

Question 8

Usually on wing-mounted engines, should both engines be on

Answer 8

Yes

Question 9

When carrying out acceleration checks what do we use as the datum

Answer 9

Oldest engine on the aircraft to ensure engines will accelerate at the same rate

Question 10

When an engine has operated at idle or high power levels it should be left to cool for how long

Answer 10

5 minutes

Question 11

When an engine has operated at idle or high power levels it should be left to cool for how long

Answer 11

5 minutes

Question 12

Why is a cool down time necessary during shutdown purposes

Answer 12

• prevent possible seizures of rotors

Question 13

What indications are used for engine monitoring

Answer 13

• EPR
• Rotor speed (N1, N2 and N3)
• Fuel flow
• exhaust gas temperature (EGT)

Question 14

What does the EPR give

Answer 14

Indication of thrust output

Question 15

Which spool gives more thrust

Answer 15

• N1

Question 16

Explain fuel flow indication

Answer 16

• monitor fuel consumption during flight
• trend monitoring purposes

Question 17

If EGT exceeds red line what must happen

Answer 17

Inspection of the critical engine are required

Question 18

What is used to indicate power developed by turbo prop and turbo shaft engines

Answer 18

• Torque monitoring systems

Question 19

How is torque displayed in flight deck

Answer 19

• torque oil pressure
• torque percentage
• direct horse power read out

Question 20

What instrument is used to indicate torque

Answer 20

• torque meter

Question 21

Explain hydro mechanical sensing system

Answer 21

• ## converts engine oil pressure to torque signal

Question 22

Explain electronic sensing systems

Answer 22

• converts twist of the power output shaft into a torque signal

Question 23

Explain phase displacement

Answer 23

Shaft that consist of 2 shafts with a phonic wheel

Question 24

The data recording on board the aircraft is performed by ?

Answer 24

Aircraft condition monitoring (ACMS)

Question 25

Engines with hydro-mechanical fuel controls need an additional computer for what reason

Answer 25

• parameter measurement (Power plant data multiplexer) (PMUX)

Question 26

What does the Data management unit (DMU) do and where is it located

Answer 26

• Records the data and complies the ACMS report
• located in aircraft

Question 27

ACMS reports are used when

Answer 27

• routine reports
  -request reports (e.g. flight crew)
• advisory reports

Question 28

During how many take offs is a ACMS report generated

Answer 28

4

Question 29

Cruise report is generated after how many take offs

Answer 29

35 take offs

Question 30

If the engine results are critical what occurs

Answer 30

Critical warning for Maintenance engineers is triggered

Question 31

Magnetic particles are divided into 4 primary groups

Answer 31

• swarf
• magnetic fines
• metal flakes
• chip

Question 32

What colour is the sludge by magnetic fines

Answer 32

Black sludge

Question 33

What is the boroscope inspection for

Answer 33

• internal visual inspection of engine

Question 34

Modern engines use what to detect engine vibration

Answer 34

Piezoelectric accelerometers

Question 35

Work of any blade damage must be carried out by?

Answer 35

• hand (using files)(emery cloth)

Question 36

Where are metal flakes found from

Answer 36

• ball bearings, gear teeth etc

Question 37

Where are accelerometers fitted

Answer 37

To fan or LP casing and turbine casing

Question 38

How are carbon deposits from nozzle cleaned

Answer 38

By approved cleaning fluid

Question 39

How to remove softened carbon deposits

Answer 39

• with soft bristle brush

Question 40

Why would you perform a compressor wash

Answer 40

• to get rid of contaminants that reduces efficiency

Question 41

In the turbine, contaminants takes the form of what

Answer 41

• sulfidation (build up of sulphur deposits from burning fuel)

Question 42

What is used to rinse compressor if the major cause of contamination is salt ingestion

Answer 42

• fresh water

Question 43

Explain desalination wash

Answer 43

• using fresh water to rinse while running engine at idle speed.
• Or while motoring the engine over on the starter