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M15✅ > 15.21 OPERATION AND MONITORING👌🏼 > Flashcards

15.21 OPERATION AND MONITORING👌🏼 Flashcards

1
Q

As engine speed increases what happens to fuel

A

Increased fuel supply

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2
Q

Where should the aircraft be positioned

A

Into the wind

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3
Q

The aircraft must be clear up to what distance

A

10 metres

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4
Q

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

A

40-55psi

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5
Q

Fuel should only be introduced when

A

Correct engine speed reached

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6
Q

Why should EGT be monitored during engine run

A
  • to ensure maximum start temperature is not exceeded
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7
Q

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

A

-operational life is shorter

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8
Q

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

A

Yes

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9
Q

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

A

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

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10
Q

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

A

5 minutes

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11
Q

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

A

5 minutes

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12
Q

Why is a cool down time necessary during shutdown purposes

A
  • prevent possible seizures of rotors
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13
Q

What indications are used for engine monitoring

A
  • EPR
  • Rotor speed (N1, N2 and N3)
  • Fuel flow
  • exhaust gas temperature (EGT)
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14
Q

What does the EPR give

A

Indication of thrust output

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15
Q

Which spool gives more thrust

A
  • N1
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16
Q

Explain fuel flow indication

A
  • monitor fuel consumption during flight
  • trend monitoring purposes
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17
Q

If EGT exceeds red line what must happen

A

Inspection of the critical engine are required

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18
Q

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

A
  • Torque monitoring systems
19
Q

How is torque displayed in flight deck

A
  • torque oil pressure
  • torque percentage
  • direct horse power read out
20
Q

What instrument is used to indicate torque

A
  • torque meter
21
Q

Explain hydro mechanical sensing system

A
  • ## converts engine oil pressure to torque signal
22
Q

Explain electronic sensing systems

A
  • converts twist of the power output shaft into a torque signal
23
Q

Explain phase displacement

A

Shaft that consist of 2 shafts with a phonic wheel

24
Q

The data recording on board the aircraft is performed by ?

A

Aircraft condition monitoring (ACMS)

25
Q

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

A
  • parameter measurement (Power plant data multiplexer) (PMUX)
26
Q

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

A
  • Records the data and complies the ACMS report
  • located in aircraft
27
Q

ACMS reports are used when

A
  • routine reports
    -request reports (e.g. flight crew)
  • advisory reports
28
Q

During how many take offs is a ACMS report generated

A

4

29
Q

Cruise report is generated after how many take offs

A

35 take offs

30
Q

If the engine results are critical what occurs

A

Critical warning for Maintenance engineers is triggered

31
Q

Magnetic particles are divided into 4 primary groups

A
  • swarf
  • magnetic fines
  • metal flakes
  • chip
32
Q

What colour is the sludge by magnetic fines

A

Black sludge

33
Q

What is the boroscope inspection for

A
  • internal visual inspection of engine
34
Q

Modern engines use what to detect engine vibration

A

Piezoelectric accelerometers

35
Q

Work of any blade damage must be carried out by?

A
  • hand (using files)(emery cloth)
36
Q

Where are metal flakes found from

A
  • ball bearings, gear teeth etc
37
Q

Where are accelerometers fitted

A

To fan or LP casing and turbine casing

38
Q

How are carbon deposits from nozzle cleaned

A

By approved cleaning fluid

39
Q

How to remove softened carbon deposits

A
  • with soft bristle brush
40
Q

Why would you perform a compressor wash

A
  • to get rid of contaminants that reduces efficiency
41
Q

In the turbine, contaminants takes the form of what

A
  • sulfidation (build up of sulphur deposits from burning fuel)
42
Q

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

A
  • fresh water
43
Q

Explain desalination wash

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

M15✅ (16 decks)

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