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M15 vid > 15.21 > Flashcards

15.21 Flashcards

1
Q

What are the types of servicing

A

Scheduled and Unscheduled

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2
Q

When all engine are stabilised what must you check for?

A

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

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3
Q

What does AIDS stand for

A

Aircraft Integrated Data Systems

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4
Q

What must you switch off at IDLE rpm

A

Start and ignition

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5
Q

What does the EPR indicate

A

The thrust output

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6
Q

What does torque monitoring systems indicate in the flight deck

A

Power developed by the turbo-prop or turbo shaft engines

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7
Q

Centrifugal compressor engines measure engine power by comparing what

A

Engine rpm and jet pipe temperature

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8
Q

What does DMU sand for and what dose it do?

A

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

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9
Q

What are the accelerations measured in

A

Inches per second and millimetres per second

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10
Q

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

A

2 are fitted,

One is fitted on the fan or LP casing

The second one is fitted to the turbine casing

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11
Q

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

A

~ performance monitoring
~ system monitoring
~ condition monitoring

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12
Q

What does EGT stand for

A

Engine gas temperature

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13
Q

What must you do when the EGT passes the red line

A

Inspections are demanded

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14
Q

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

A

3 minutes

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15
Q

What is Hard time

A

Removal of intense for overhaul pr replacement at specified intervals

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16
Q

What do modern engines use to detect engine vibration

A

Piezoelectric accelerometers

17
Q

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

A

Close throttle and HP cock

18
Q

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

A

The logbook

19
Q

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

A

Engine trimming

20
Q

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

A

It can damage the titanium

21
Q

What can FOD cause in the engine

A

Hard rubs

22
Q

What does TBO stand for

A

Time Between overhaul

23
Q

What must you do when we get a LP rotation indication

A

Open HP cock

24
Q

What is on condition

A

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

25
Q

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

A

10 meters

26
Q

What is a desalination wash

A

Using fresh water to wash the compressor

27
Q

What are the three main methods of conditioning monitoring

A

Flight deck indicators
In flight recorders
Ground indicators

28
Q

What are the 3 maintenance processes that the CAA recognise

A

~ Hard time
~ On-condition
~ Condition Monitoring

29
Q

What re the most common used sensing systems for torque monitoring

A

Hydro mechanical ( engine oil pressure —> torque signal)

Electronic ( twist of the power O/P shaft —> torque signal )

30
Q

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

A

Aircraft condition monitoring system (ACMS)

31
Q

What does JPT stand for

A

Jet pipe temperature

32
Q

At what speed can you carry out engine adjustment

A

Ideal rpm

33
Q

What ways can torque be displayed in the cockpit

A

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

34
Q

What is the EPR

A

Ratio of the jet pipe pressure:compressor inlet pressure

35
Q

What is condition monitoring

A

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

36
Q

What does MCD stand for

A

Magnetic Chip Detector

37
Q

What is trimming?

A

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

38
Q

Engine torque is proportional to what?

A

Horse power 🐴

39
Q

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

A

Isopropyl alcohol as an anti freeze

M15 vid (15 decks)

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