15.21

Question 1

What are the types of servicing

Answer 1

Scheduled and Unscheduled

Question 2

When all engine are stabilised what must you check for?

Answer 2

Oil pressure & temperature, EGT & RPM (N1,N2(&N3)), fuel flow, vibration and EPR

Question 3

What does AIDS stand for

Answer 3

Aircraft Integrated Data Systems

Question 4

What must you switch off at IDLE rpm

Answer 4

Start and ignition

Question 5

What does the EPR indicate

Answer 5

The thrust output

Question 6

What does torque monitoring systems indicate in the flight deck

Answer 6

Power developed by the turbo-prop or turbo shaft engines

Question 7

Centrifugal compressor engines measure engine power by comparing what

Answer 7

Engine rpm and jet pipe temperature

Question 8

What does DMU sand for and what dose it do?

Answer 8

Data Management Unit, records the data and makes it into a ACMS report

Question 9

What are the accelerations measured in

Answer 9

Inches per second and millimetres per second

Question 10

How many accelerometer are fitted in an engine and where are they located?

Answer 10

2 are fitted,

One is fitted on the fan or LP casing

The second one is fitted to the turbine casing

Question 11

What can the engine performance and limitations indications be classified into ( 3 groups)

Answer 11

~ performance monitoring
~ system monitoring
~ condition monitoring

Question 12

What does EGT stand for

Answer 12

Engine gas temperature

Question 13

What must you do when the EGT passes the red line

Answer 13

Inspections are demanded

Question 14

After engine run how long should you keep the engine on ideal before closing the HP cock

Answer 14

3 minutes

Question 15

What is Hard time

Answer 15

Removal of intense for overhaul pr replacement at specified intervals

Question 16

What do modern engines use to detect engine vibration

Answer 16

Piezoelectric accelerometers

Question 17

After gaining clearance from ground crew to start the engine what must you do next

Answer 17

Close throttle and HP cock

Question 18

Before working on the gas turbine engine, what must you check prior to positioning the aircraft

Answer 18

The logbook

Question 19

When the engines are running, what else can you carry out if required

Answer 19

Engine trimming

Question 20

Why can you not use methanol during compressor cleaning with water at low temperature

Answer 20

It can damage the titanium

Question 21

What can FOD cause in the engine

Answer 21

Hard rubs

Question 22

What does TBO stand for

Answer 22

Time Between overhaul

Question 23

What must you do when we get a LP rotation indication

Answer 23

Open HP cock

Question 24

What is on condition

Answer 24

Process which involves the inspection,test or checking of particular items at specified periods to ensure they remain in service

Question 25

How much clearance distance should the aircraft have in front of the engines

Answer 25

10 meters

Question 26

What is a desalination wash

Answer 26

Using fresh water to wash the compressor

Question 27

What are the three main methods of conditioning monitoring

Answer 27

Flight deck indicators In flight recorders Ground indicators

Question 28

What are the 3 maintenance processes that the CAA recognise

Answer 28

~ Hard time ~ On-condition ~ Condition Monitoring

Question 29

What re the most common used sensing systems for torque monitoring

Answer 29

Hydro mechanical ( engine oil pressure —> torque signal) Electronic ( twist of the power O/P shaft —> torque signal )

Question 30

What system on board the aircraft records the data of the engine condition

Answer 30

Aircraft condition monitoring system (ACMS)

Question 31

What does JPT stand for

Answer 31

Jet pipe temperature

Question 32

At what speed can you carry out engine adjustment

Answer 32

Ideal rpm

Question 33

What ways can torque be displayed in the cockpit

Answer 33

~ torque oil pressure ~ torque percentage ~ direct horse power dead out

Question 34

What is the EPR

Answer 34

Ratio of the jet pipe pressure:compressor inlet pressure

Question 35

What is condition monitoring

Answer 35

Not a preventative process, info gained from operational experiences is collected

Question 36

What does MCD stand for

Answer 36

Magnetic Chip Detector

Question 37

What is trimming?

Answer 37

Term applied to idle speed, various throttle setting and maximum thrust adjustment during engine performance testing

Question 38

Engine torque is proportional to what?

Answer 38

Horse power 🐴

Question 39

What must you use when cleaning the compressor in low temperature conditions with water

Answer 39

Isopropyl alcohol as an anti freeze