Engine

Question 1

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

Answer 1

FADEC disregards command

Question 2

What does OVRD command on the Ignition Selector Knob?

Answer 2

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

Question 3

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

Answer 3

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

Question 4

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

Answer 4

Fuel Metering Unit (FMU)

Question 5

Where is oil pressurized?

Answer 5

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

Question 6

What are the 2 major components of the starter system?

Answer 6

1. Air Turbine Starter (ATS)
2. Starter Control Valve

Question 7

When does the SCV close?

Answer 7

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

Question 8

What is the purpose of the SCV?

Answer 8

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

Question 9

What commands the SCV to open?

Answer 9

FADEC

Question 10

Which igniters are excited for in-flight restarts?

Answer 10

Both igniters are energized

Question 11

Where are Exciters 1B and 2B CMD located?

Answer 11

SPDA

Question 12

Where are Exciters 1A and 2A CMD located?

Answer 12

AC STBY BUS in EICC

Question 13

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

Answer 13

No, only on the ground

Question 14

An auto relight occurs in flight when what happens?

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

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

Question 17

Inadvertent thrust reverser deployment in flight limits thrust to what?

Answer 17

Thrust is commanded to idle

Question 18

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

Answer 18

T2 sensor

Question 19

What 4 scenarios does the ATTCS command RSV power?

Answer 19

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

Question 20

What types of engines are on the aircraft?

Answer 20

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

Question 21

How much thrust do the engines produce?

Answer 21

14,200 lbs of thrust

Question 22

Describe the N1 spool?

Answer 22

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

Question 23

Describe the N2 spool?

Answer 23

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

Question 24

How many igniters per engine?

Answer 24

2 igniters per engine

Question 25

Can the igniters be turned off in flight?

Answer 25

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

Question 26

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

Answer 26

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

Question 27

What sources are available for engine starting

Answer 27

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

Question 28

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

Answer 28

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

Question 29

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

Answer 29

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

Question 30

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

Answer 30

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

Question 31

What happens after 3 overspeed detection events?

Answer 31

FADEC will not re-light the engine

Question 32

What heats the fuel and cools the engine oil

Answer 32

Fuel-Oil Heat Exchanger

Question 33

When is thrust reverse available?

Answer 33

1. WoW 2. Thrust levers idle

Question 34

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

Answer 34

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

Question 35

How many fan blades are on the CF-348E5

Answer 35

28 Fan Blades

Question 36

What are the Thrust Reverser Lockouts used for?

Answer 36

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

Question 37

What is Vx and Vy for the 175?

Answer 37

Vx = Green Dot Vy = Green Dot + 50 kts

Question 38

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

Answer 38

Thrust Levers less than 5˚

Question 39

How many oil sumps are there and how many bearings?

Answer 39

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

Question 40

What does the oil system lubricate?

Answer 40

AGB and 5 bearings

Question 41

Describe the Variable Geometry Actuators

Answer 41

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

Question 42

What happens to engine power at 1200' RA?

Answer 42

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

Question 43

What is max oil qty and usable oil qty?

Answer 43

max = 10.5 qts usable = 7.2 qts

Question 44

Describe the interlock function of the FADEC

Answer 44

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

Question 45

How many idles does the engine have?

Answer 45

1. Ground idle 2. Flight Idle 3. Approach Idle 4. Final Approach Idle

Question 46

Which idles increase min N1 due to ice speeds?

Answer 46

Flight Idle and Approach Idle for bleed protection

Question 47

What is on the AGB?

Answer 47

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