Powerplant

Question 1

When will FADEC generator start powering the FADEC?

Answer 1

35% HP.

At approximately 35% HP, a Permanent Magnetic Alternator (PMA), driven by the engine’s accessory drive gearbox, provides electrical
power to the EEC’s and FADEC’s.

Question 2

What is the backup power supply to the FADEC (if FADEC generator fails, or RPM too slow for that generator to provide power)?

Answer 2

L and R ESS DC Buses

Question 3

A Blue CAS “Engine Start Protect L-R” means what?

Answer 3

Indicated engine FADEC is automatically commanding extended time for monitoring engine (20 minutes to 5 hours) prior to introducing fuel to the engine for start. 10 - 30 second crank to reduce wobble from partially-cooled drive shaft.

Question 4

Name some of the components driven by the accessory gear box.

Answer 4

IDG
Fuel Pump
Fuel Monitoring Unit (FMU)
Hydraulic Pump
Oil Pump
Engine Breather
Air Turbine Starter
PMA

Question 5

What happens to the spinner on the face of the LP if ice accumulates during engine operation?

Answer 5

The soft rubber tip distorts and provides passive ice shedding.

Question 6

What happens to engine during water ingestion?

Answer 6

Bleed handling valves are commanded OPEN, continuous ignition is selected ON automatically, and engine idle speed is increased to ensure engine stability and allow water to pass into bypass flow.

Question 7

Primary function of Engine Vibration Monitoring System (EVMS) is to monitor the balance of rotating assemblies in the engine in order to detect possible mechanical failure. How many sets of probes are used?

Answer 7

Two (2) sets of probes (one primary and one secondary) to measure amount of rotation on both LP and HP rotating components

Question 8

When should an engine be shut down for abnormal EVM indications?

Answer 8

If vibration is accompanied by other failure indications

Question 9

How is EPR derived and what happens with a loss of EPR?

Answer 9

It’s a ratio of outlet over inlet pressure. The engine reverts to ALT control with loss of EPR.

Question 10

What’s the primary purpose of Fuel Cooled Oil Cooler (FCOC)?

Answer 10

It enables engine oil to heat fuel and prevent formation of ice crystals in LP filter and FMU. It also cools the oil.

Question 11

What happens during engine shutdown if capacity of drains tank
(environmental container) is exceeded?

Answer 11

Fuel is dumped overboard

Question 12

When does Fluid Quantity Indicator (FQI) take a snap shot of
oil quantity and store it as a historical reading?

Answer 12

5 minutes after shutdown

Question 13

How does FADEC alternate channels for consecutive ground starts?

Answer 13

It changes channels every time you cycle FUEL CONTROL switch and changes exciters/igniters every other time unless there’s a start anomaly.

Question 14

True/False: When normal ground start attempt is aborted due to anomalies, FADEC automatically selects the other igniter on the following normal ground start attempt.

Answer 14

True

Question 15

True/False: Ignition systems are capable of being continuously energized by pilot selection of continuous ignition.

Answer 15

True. There’s no time limitation; however, continued or very frequent use shortens igniter life.

Question 16

Which type of engine start uses just one igniter?

Answer 16

Normal ground start including crossbleed start and engine start – battery power only.
Both igniters are used for alternate engine ground start and all air starts as well as inclement weather mode, auto-relight, and quick relight.

Question 17

What happens when you select MASTER START switch to ON?

Answer 17

It signals FADEC to arm the automatic start sequence for start valve and ignition, opens isolation valve and shuts off the right pack.

Question 18

During engine start, when would you expect Starter Air Valve
(SVO) and IGN icons to extinguish?

Answer 18

Approximately 44%

Question 19

What’s the caution associated with opening the starter air valve manually?

Answer 19

Wear high temperature gloves and exercise caution.

Question 20

Under what conditions would you use the Manual Airstart –

Windmilling procedure?

Answer 20

If starter was inoperative.

Question 21

Name the three (3) airstart procedures

Answer 21

Normal Airstart – Automatic,

Manual Airstart – Starter-Assist
Manual Airstart – Windmilling

Question 22

What’s the auto-relight mode?

Answer 22

It’s automatically initiated by FADEC for engine flameout and rundown. In this mode, FADEC energizes both igniters continuously and schedules fuel flow until rpm stabilizes.

Question 23

What’s the quick relight mode?

Answer 23

Provides a means of automatically relighting the engine if FUEL CONTROL switch is selected to OFF position and then reselected to RUN position within 30 seconds.

When activated, fuel is commanded on and both ignition systems are switched ON.

Question 24

What are the requirements for engaging autothrottles on takeoff?

Answer 24

Valid EPR rating selected, valid speed target selected, and > 1.05 EPR

Question 25

Why do autothrottles go into hold mode at 60 kts during takeoff?

Answer 25

Autothrottle servos are deenergized to prevent unwanted thrust reductions during critical takeoff between 60 kts airspeed, rotation and climbout to 400’ AGL.

Question 26

When does autothrottle system come out of hold?

Answer 26

400’ AGL

Question 27

What happens if you push TO/GA during a fully coupled two engine ILS approach?

Answer 27

Go-around is commanded (initial 9° pitch up and wings level), both autopilot and autothrottles remain engaged, power levers advance to go-around power, and FMS sequences to missed approach procedure.

Question 28

Name the three idle settings.

Answer 28

Flight
Approach (i.e., high idle)
Low or ground idle

Question 29

What’s the requirement for approach idle?

Answer 29

Flaps > 20°, aircraft in flight and no wheel spin-up

Question 30

What’s the downside to alternate

control mode?

Answer 30

You lose FADEC protection, you lose autothrottles, and you can’t dispatch in alternate control.

Question 31

When would thrust reversers be available after landing?

Answer 31

With wheel spin-up or weight-on-wheels

Question 32

Were thrust reversers considered for landing distance certification?

Answer 32

Not on dry runways. They were considered for Wet.

Question 33

How is the engine controlled in reverse thrust region?

Answer 33

LP

Question 34

Describe thrust reverser indications.

Answer 34

White REV – unlocked
Green REV – fully deployed (maximum reverse thrust available)
Amber REV – uncommanded deployment on the ground: engine limited to idle
Flashing red REV – deployment in flight: engine limited
to idle