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Mesa 175 systems > Engine > Flashcards

Engine Flashcards

1
Q

What type of Engine do we have?

A

General Electric CF34-8E5
High-Bypass, 2 spool, axial-flow, turbo-fan

2 spools = N1(4 stages) and N2 (10 stages) section

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1
Q

How much thrust does teh CF-34-8E5 engines product?

A

13,000 lbs
14,200 lbs with ATTCS

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2
Q

How is the engine controlled?

A

Dual channel FADEC system

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3
Q

What does WML by N2 mean?

A

A WML icon is displayed whenever the FADEC has detected an engine flameout and the auto re-light system is actuating to restart the engine.

an assisted start has been commanded

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4
Q

How many igniters per engine?

A

2 per engine

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5
Q

How many igniters activate for engine start?

A

Ground 1 igniter - switch in AUTO
flight - 2 igniters - switch in auto)

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6
Q

What happens when the ignition switch is selected to OVRD?

A

Activates both igniters on the ground or in flight.
igniters 1B and 2B are connected to SPDA 2 - in case of SPDA 2 failure, setting the selector knob to OVRD energizes at least igniter A.

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7
Q

Can the igniters be turned off during flight?

A

switch may be moved to the OFF position but the FADEC disregards the command.
the OFF position is used for dry motoring on the ground only

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8
Q

what is the purpose of the lubrication system?

A

lubricates and cools the turbine engine main shaft bearings and the accessory gearbox and the engine

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9
Q

is only one FADEC channel used every flight?

A

no, they automatically alternate with each engine start

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10
Q

what does the cyan line on the N1 gauge represent during approach? when does it appear?

A

the minimum N1 for bleed requirements in icing conditions
configured for landing <1200’ RA when anti-ice is on.

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11
Q

what sources are available for engine starting?

A

APU
Ground source (huffer cart or air cart unit. Same same)
opposite engine (crossbleed start)
windmill start

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12
Q

Does the FADEC provide engine start protection?

A

only on the ground for a hot start, hung start or no light-off. no protection in flight.

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13
Q

what does the engine starting system consist of?

A

Air Turbine Starter (ATS)
Starter Control Valve (SCV)

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14
Q

what does the pneumatic system provide here?

A

bleed air to the ATS to rotate the rotor speed and start the engine

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15
Q

what will the FADEC automatically do in case of a start on the ground?

A

FADEC will not allow fuel flow if ITT > 120 degrees C
FADEC Will automatically dry motor engine and introduce fuel when ITT < 120 C

16
Q

Describe the engine start sequence

A

start switch momentarily to START:
7% N2 ignition
20% N2 fuel flow
20% N2 + 5 seconds light off
50% N2 ignition off
50% N2 starter cutout

17
Q

When is the engine stabilized?

A

N1 27%
ITT 460 Degrees C
N2 62%
FF 550 lbs/hr
Oil pressure > 25 PSI

18
Q

What provides underspeed and overspeed protection?

A

the FADEC via the Fuel Metering Unit (FMU)
Approximately 52% N2 and 102% N2 respectively.

19
Q

what happens after 3 overspeed detection events?

A

FADEC will not re-light the engine

20
Q

what heats the fuel and cools the engine oil?

A

fuel/oil heat exchanger

21
Q

What is ATTCS? What controls it?

A

Automatic Take-off Thrust Control System
Provides max thrust reserve (RSV) according to current rate previously selected via the MCDU
FADEC controlled - available for takeoff and go around (automatically armed when thrust rate mode is GA)

22
Q

what will trigger an ATTCS events?

A

N1 difference > 15% between engines
Engine failure during TOGA
Engine failure during go around
windshear detected

23
Q

When are thrust reversers available?

A

Weight-on-wheels

24
Q

what happens if a thrust reverser inadvertently deploys?

A

FADEC limits respective engine thrust to idle

25
Q

what engine thrust rating(s) may only be used for 10 minutes?

A

TO-1
TO-1 RSV (TL beyond TOGA)
GA (two engine go-around)
GA-RSV (one engine go around or windshear)

26
Q

What is FLEX?

A

Reduced takeoff thrust based on assumed temperature (telling FADEC that it is warmer than it actually is so it will reduce the thrust)

27
Q

Can the FlEX thrust be reduced lower than CLB thrust?

A

no

28
Q

describe the thrust reversers

A

hydraulically actuated and controlled from the cockpit via the thrust lever
thrust levers 1 and 2 operate independently and are actuated by the respective hydraulic system

29
Q

What is the Permanent Magnet Alternator (PMA)?

A

Above 50% N2, the FADEC is powered by the PMA.

Converts mechanical energy to AC
One per engine
On accessory gear box

30
Q

What is maximum continuous rating (CON)

A

maximum continuous thrust to be used on emergency situations where thrust higher than usual is required

Mesa 175 systems (15 decks)

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