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Mesa E-175 Oral Prep 2022 (just updated) > Engine > Flashcards

Engine Flashcards

1
Q

What happens when you turn the Ignition Selector Knob to the OFF Position in flight?

A

FADEC disregards command

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2
Q

What does OVRD command on the Ignition Selector Knob?

A

enables FADEC to continuously activate both exciters
when the engine is running

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3
Q

What does the word OFF in CYAN color on the N1 EICAS indication indicate?

A

The cyan OFF indication is displayed when the engine is
shut down by pilot action.

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4
Q

What meters and distributes the proper amount of fuel for combustion to the injectors?

A

Fuel Metering Unit (FMU)

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5
Q

Where is oil pressurized?

A

In the oil lubrication pump then passes through the filter then heat exchanger (bottom RH side of engine) then dispersed through engine

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6
Q

What are the 2 major components of the starter system?

A
  1. Air Turbine Starter (ATS)
  2. Starter Control Valve
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7
Q

When does the SCV close?

A

When starter cutout speed is reached (normally 50% N2)

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8
Q

What is the purpose of the SCV?

A

Opens to allow bleed air from APU, X-side engine, or ground source to power the ATS

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9
Q

What commands the SCV to open?

A

FADEC

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10
Q

Which igniters are excited for in-flight restarts?

A

Both igniters are energized

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11
Q

Where are Exciters 1B and 2B CMD located?

A

SPDA

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12
Q

Where are Exciters 1A and 2A CMD located?

A

AC STBY BUS in EICC

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13
Q

Does the FADEC provide automatic shutdown protection against hot, hung, or no-light starts in flight?

A

No, only on the ground

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14
Q

An auto relight occurs in flight when what happens?

A

In the event of an engine flameout, the FADEC commands both igniters on

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15
Q

After how many seconds should a relight attempt in flight be manually abort?

A

30 seconds after fuel flow began and bring the START/STOP selector knob to the STOP position

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16
Q

How are the thrust reversers actuated and what type are they?

A

They are actuated by hydraulic power and are of the Cascade type

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17
Q

Inadvertent thrust reverser deployment in flight limits thrust to what?

A

Thrust is commanded to idle

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18
Q

What is the name of the sensor that measure engine inlet temp?

A

T2 sensor

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19
Q

What 4 scenarios does the ATTCS command RSV power?

A

Automatic:
1. 15% difference of N1 values
2. OEI TO
3. OEI GA
4. Windshear
Manual:
1. Thrust Levers to Max Detent

20
Q

What types of engines are on the aircraft?

A

2 GE CF-348E5 Hi-Bypass, 2 Spool, Axial-Flow, Turbofan Engines

21
Q

How much thrust do the engines produce?

A

14,200 lbs of thrust

22
Q

Describe the N1 spool?

A

Single-stage Turbofan and 4 Low Pressure Turbines (1:4)

23
Q

Describe the N2 spool?

A

10 Stage, axial-flow compressors with 2 stage High Pressure Turbines (10:2)

24
Q

How many igniters per engine?

A

2 igniters per engine

25
Q

Can the igniters be turned off in flight?

A

The FADEC ignores the command if the Igniter switch is moved to the OFF position

26
Q

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

A

It is the min N1 to meet bleed requirements and will appear when configured for landing < 1200’ RA when A/I is on

27
Q

What sources are available for engine starting

A
  1. APU
  2. Ground Source (huffer cart or air bottle)
  3. X-side bleed start
  4. WML start
28
Q

Above which ITT will the FADEC not allow FF for initial engine start?

A

> 120º C and FADEC will auto dry motor engine until temp is below 120º C

29
Q

What does WML next to the N2 mean on the EICAS?

A
  1. Engine is currently windmilling
  2. FADEC has determined a flameout and is attempting a re–light or
  3. Assisted start has been commanded
30
Q

What within the FADEC provides the under and overspeed protection and at what percentages?

A

The FMU in the FADEC at 52% (underspeed) and 102% (overspeed) N2

31
Q

What happens after 3 overspeed detection events?

A

FADEC will not re-light the engine

32
Q

What heats the fuel and cools the engine oil

A

Fuel-Oil Heat Exchanger

33
Q

When is thrust reverse available?

A
  1. WoW
  2. Thrust levers idle
34
Q

Can the FLEX thrust be reduced lower than CLB-2 thrust?

A

No. Min Power is 75% for TO or Climb-2 + 0.5% N1, whichever is higher

35
Q

How many fan blades are on the CF-348E5

A

28 Fan Blades

36
Q

What are the Thrust Reverser Lockouts used for?

A

They are red, and used to denote an MEL’d TR

37
Q

What is Vx and Vy for the 175?

A

Vx = Green Dot
Vy = Green Dot + 50 kts

38
Q

TLA must be below which angle for FADEC to give the OK to an Engine Shutdown on ground?

A

Thrust Levers less than 5˚

39
Q

How many oil sumps are there and how many bearings?

A

A Sump = Bearings 1,2,3
B Sump = Bearing 4
C Sump = Bearing 5

40
Q

What does the oil system lubricate?

A

AGB and 5 bearings

41
Q

Describe the Variable Geometry Actuators

A

2 VGAs per engine, master/slave configuration, fuel pressure driven that control compressor stator vanes stages 1-4

42
Q

What happens to engine power at 1200’ RA?

A

N1 goes into Final Approach Idle, cyan tick mark for min bleed air requirements displayed on N1 at 1200’ RA

43
Q

What is max oil qty and usable oil qty?

A

max = 10.5 qts
usable = 7.2 qts

44
Q

Describe the interlock function of the FADEC

A

Prevents inadvertent deployment of the TR 2 main actuators and cowl lock. The cowl lock itself is the main defense again TR deployment.

45
Q

How many idles does the engine have?

A
  1. Ground idle
  2. Flight Idle
  3. Approach Idle
  4. Final Approach Idle
46
Q

Which idles increase min N1 due to ice speeds?

A

Flight Idle and Approach Idle for bleed protection

47
Q

What is on the AGB?

A

FISH Oil Plus
1. Fuel EDP
2. IDG
3. ATS
4. Hydraulic EDP
5. Lube & Scavenge
6. Chip detector

Mesa E-175 Oral Prep 2022 (just updated) (20 decks)

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