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CAA Module 15 > Module 15.21 Operation and monitoring > Flashcards

Module 15.21 Operation and monitoring Flashcards

1
Q

What effect does moving the throttle lever from the idle have?

A

Causes the fuel control system to supply more fuel as the engine increases

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2
Q

What position must the throttle lever be in for thrust reversers to deploy?

A

Idle

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3
Q

How should the aircraft be positioned for an engine run up?

A

Into the wind with chocks fitted and brakes on

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4
Q

What distance in front of the engine on a run-up must be clear?

A

10m

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5
Q

Does ATC need to be informed of a ground run?

A

Yes, permission, duration and ground run type must be given

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6
Q

Should the beacon lights be on during an engine ground run?

A

Yes

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7
Q

When the engine/s are running, what can be carried out?

A

Engine trimming

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8
Q

Why must both engines be run?

A

To prevent asymmetry

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9
Q

When can engine power be increased above idle?

A

When absolutely necessary

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10
Q

When carrying out acceleration checks on aircraft engines, what engine must be used as datum?

A

The oldest engine

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11
Q

How long should the engine be left at idle before turning off to allow for cool down?

A

5 mins

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12
Q

What indications are used for engine monitoring?

A
  • EPR
  • N1 and N2 (N3)
  • FF
  • EGT
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13
Q

How do centrifugal compressor engines measure engine power?

A

Engine RPM and Jet Pipe Temperature (JPT)

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14
Q

What is the EPR the ratio between?

A

Jet pipe pressure and compressor inlet

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15
Q

What method of power measurement do axial flow bypass engines use?

A

EPR

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16
Q

Torque monitoring systems are used to indicate the power on what engines?

A

Turboprop and turboshaft

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17
Q

Torque monitoring systems can also be used for what?

A
  • Auto operate feathering system
  • Assist in auto operation of water injection system
  • Limit engine output
  • Balance power between engines
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18
Q

What are the methods of displaying torque in the flight deck?

A
  • Torque oil pressure
  • torque percentage
  • Direct horsepower read out
19
Q

What are the two types of torque sensing systems?

A
  • Hydromechanical
  • Phase displacement
20
Q

When would an engine be removed?

A

Change of time limited parts or repair of damages

21
Q

What performs the aircraft data recording?

A

Aircraft Condition Monitoring System (ACMS)

22
Q

What compiles the ACMS data reports?

A

Data Management Unit

23
Q

How can these ACMS reports be accessed?

A

Printing or via ground data link

24
Q

What does thermodynamic analysis identify?

A

Wear of gas path components during engine operation

25
Q

Mechanic-dynamic analysis identifies what?

A

Vibration caused by fan and turbine systems

26
Q

For how many takeoffs is an ACMS report generated for after engine installation?

A

4 take-offs

27
Q

Later on, a take-off report is generated after how many take-offs?

A

35 take-offs

28
Q

The system selects a stable cruise condition for generation of what report?

A

Cruise report

29
Q

Where are these cruise and take-off reports stored?

A

Engine database

30
Q

What are the two ways of finding particles in the oil?

A
  • Magnetic chip detectors
  • SOAP
31
Q

Magnetic particles can divided into what 4 groups?

A
  • Swarf
  • Magnetic fines
  • Metal flakes
  • Chip
32
Q

What are magnetic fines shown as on the MCD?

A

Black sludge

33
Q

Where are metal flakes from?

A

Gear teeth and bearings

34
Q

What is a boroscope inspection?

A

Internal visual inspection of the engine

35
Q

Where are the vibration accelerometers located?

A

fan or LP casing and turbine casing

36
Q

What is the most common defect found while inspecting the hot section?

A

Cracking

37
Q

When will dye or chalk be used to mark parts?

A

Directly exposed to gas path

38
Q

When will wax marking pencil be used?

A

Not exposed to gas path

39
Q

To inspect the combustion chamber for cracks what methods are used?

A

Visible dye and fluorescent penetrant

40
Q

How can fuel nozzles be cleaned?

A

Cleaning fluid and soft bristle brush

41
Q

How are turbine blades inspected and cleaned?

A

Same manner as compressor blades

42
Q

Where do stress cracks appear on the turbine blades?

A

Cracks on LE or TE

43
Q

Deformation of the blade caused by over-temperature may appear as what?

A

Waviness

44
Q

When can a compressor clean (desalinisation wash) be carried out?

A

While motoring the engine over on the starter or running the engine at idle

CAA Module 15 (18 decks)

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