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H145 > Engined day 3 > Flashcards

Engined day 3 Flashcards

1
Q

Where is the ignition unit located?

A

On the r/h side of the compressor casing

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2
Q

Where are the start and stop electro valves located?

A

on top of the centrifugal compressor casing.

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3
Q

Where are the ignitor plugs?

A

2 o’clock and 10 o’clock of the combustiuon chamber

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4
Q

How many bleed valves are on the engine?

A

1

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5
Q

What is the engine internal air system used for?

A

pressurizing labyrinth seals, cooling internal components, and balancing the forces on internal rotating parts

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6
Q

How many volts does the P3 Px Transmitter need?

A

10V

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7
Q

Where is the T1 temperture probe is installed?

A

in the engine intake before the axial compressor

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8
Q

What is the function of the T1 temperture probe?

A

the data provided is used by the EECU to compute the fuel control and engine limits

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9
Q

What is the T1 temperture probe made from?

A

Platinum

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10
Q

What is the purpose of the bleed air valve?

A

to bleed excessive P2.4 air to prevent a compressor surge.

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11
Q

Which air tapping is at the outlet of the centrifugal compressor?

A

P2.6

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12
Q

What purges the starter injectors?

A

P3 air

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13
Q

What is the purpose of the LVDTs?

A

to inform the EECU of the position and movement of each collective lever.

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14
Q

What does the ultimate back-up mode do?

A

enables the operation of the engine, in case of a level 3 failure of the EECU

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15
Q

The metering unit is part of what control?

A

the engine control

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16
Q

Which system are the starter injectors part of, engine or airframe?

A

engine components

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17
Q

The principles of limitations are based on what?

A

N1, TRQ, T4.5

18
Q

Engine limitations are based on what?

A

N1, TRQ, T4.5

19
Q

What engine information will be displayed on the VMD?

A

N1, N2, TRQ, T4.5

20
Q

If an engine is lost during flight, what mode will the aircraft enter?

A

OEI

21
Q

What N2 speed triggers an OVERSPEED?

A

120%

22
Q

The stop electro valve is energised by what?

A

the start relay

23
Q

Where is the bleed valve located?

A

at the axial compressor outlet

24
Q

Where is P2.4 air bled from?

A

the centrifugal compressor inlet

25
Q

Where is P2.6 air bled from?

A

the centrifugal compressor outlet

26
Q

Where is P3 air bled from?

A

the centrifugal compressor outlet after the diffusor

27
Q

What is the purpose of the P3 Px Transmitter?

A

used by the EECU for engine control
calculating the fuel required to prevent surge, flame out
conditions, torque exceedances or T4.5 exceedances

28
Q

What N1 speed are the starter injectors purged?

A

61%

29
Q

Can the heating system be used during a EPC/PAC?

A

No, the EECU inhibits the P3 bleed for heating.

30
Q

What could cause the Bleed Valve to always be open?

A

a dirty P3 filter blocking the air to open the valve.

31
Q

What gives the position signal of the bleed valve?

A

a micro switch within the bleed valve assembly

32
Q

Where are the LVDT’s located?

A

Underneath the transmission deck

33
Q

What caution would an N2 speed deviation from the NR datum cause?

A

FADEC N2 DISAGREE and an N2 DATUM set value of 104%

34
Q

What temperture would cause an automatic shutdown during a start?

A

T4.5 exceeding 840 C

35
Q

What RPM is the ignition relay deenergised?

A

30% N1

36
Q

What is the idle speed?

A

78% N2

37
Q

Where is the engine overspeed protection system powered from?

A

ESS BUS, not the engine alternator

38
Q

What is the primary electrical source for the EECU?

A

the engine alterantor

39
Q

What speed does the EECU power shift from ESS BUS to the engine alternator?

A

61% N1

40
Q

Where is the primary N1 speed information taken from?

A

the alternator frequency.

H145 (24 decks)

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