Powerplant And Fuel

Question 1

Power plant description

Answer 1

Reverse flow, dual spool, free turbine

Question 2

4 stages of jet engine

Answer 2

Suck
Squeeze
Bang
Blow

Question 3

Igniters on this engine?

Answer 3

Primary and secondary

Question 4

How does the engine work? (What drives what?)

Answer 4

Power turbines drive prop shaft

Question 5

Where is ITT measured?

Answer 5

Power turbines

Question 6

Where is the chip detector located?

Answer 6

Reduction gearboxes, behind the prop

Question 7

Np

Answer 7

Prop rotation (rpm)

Question 8

When is the air separator opened?

Answer 8

Start, Taxi, takeoff,
approach, landing
Icing and precipitation

Question 9

What happens to ITT when the separator is opened?

Answer 9

Increases

Question 10

Is the prop self governing?

Answer 10

Yes, except at spool up

Question 11

What fuel pumps are located on the engine assembly?

Answer 11

High pressure and low pressure

Question 12

Which generator is the starter on the Ng and Ngx aircraft?

Answer 12

2

Question 13

What is stabilized Ng after start?

Answer 13

63%

Question 14

What does the torque limiter measure?

Answer 14

Oil pressure

Question 15

How many fuel nozzles?

Answer 15

14

Question 16

What happens when the high pressure fuel pump fails?

Answer 16

Engine stops

Question 17

What does the fuel-oil heat exchanger do?

Answer 17

Warms cold fuel

Question 18

What are 3 ways to move fuel on this AC?

Answer 18

Motive flow
Gravity flow
Fuel pumps

Question 19

What provides fuel during startup?

Answer 19

Primary and secondary manifolds

Question 20

RPM at idle on ground

Answer 20

1060

Question 21

Prop speeds at what rpm are prohibited?

Answer 21

Below 950

Question 22

How does beta work?

Answer 22

Oil is pulled from the beta valve, which causes the propeller pitch to flatten

Question 23

What happens to prop pitch on shutdown?

Answer 23

Prop feathers, provided power is on

Question 24

Where are the igniters located?

Answer 24

4 o clock and 9 o clock positions

Question 25

Where does the oil level need to be to operate?

Answer 25

Above the red

Question 26

What is the engine fire detector made of?

Answer 26

Helium filled with a hydrogen core

Question 27

What is the only way to control prop pitch?

Answer 27

Feather on condition lever

Question 28

What kind of temp increase will trigger a fire alarm?

Answer 28

General overheat of 250 C

Question 29

What actuates the fire switch?

Answer 29

Localized temperature increase of 500 C

Question 30

What lights illuminate with the fire test?

Answer 30

2 master caution 2 master warning 1CAWS Engine Fire 1 CAWS Fire Detect

Question 31

If fire is suspected, what system must be turned off?

Answer 31

Air cycle machine

Question 32

When will you get the aural ‘fire-fire-fire’ during a fire test?

Answer 32

Only if GPU plugged in

Question 33

Idle maintains a minimum prop pitch of what?

Answer 33

6 degrees

Question 34

What is the MOR lever?

Answer 34

Manual override

Question 35

What will happen if CL accidentally moved to feather and then back to idle?

Answer 35

Hot start

Question 36

Why would you need to use the MOR lever?

Answer 36

Fuel control unit failure

Question 37

What is Ng?

Answer 37

Engine speed

Question 38

What is torque?

Answer 38

Measures engine torque pressure

Question 39

What happens at engine start?

Answer 39

Fuel pumps operate, prop spins, oil pressure comes up

Question 40

During start, when is the condition lever moved to the ground idle position?

Answer 40

At 14% Ng

Question 41

What indicates a hot start?

Answer 41

Rapidly rising ITT to 1000

Question 42

What is a hung start?

Answer 42

No ITT or Ng rise within 10 seconds of CL to ground idle

Question 43

Takeoff power is limited to how long?

Answer 43

5 minutes

Question 44

Max cruise and climb horsepower?

Answer 44

1000

Question 45

Max takeoff torque?

Answer 45

44.4

Question 46

Max takeoff ITT

Answer 46

800 C

Question 47

Max cruise ITT

Answer 47

720 C

Question 48

Max cruise torque

Answer 48

36.9

Question 49

Where can you look to see what types of fuel and oil are approved for the engine?

Answer 49

Pratt and Whitney service bulletin

Question 50

WHat are 3 propeller protections from overspeed?

Answer 50

Prop governor Overspeed governor Nf governor

Question 51

What are the tanks in the fuel system?

Answer 51

Main tanks Collector tanks

Question 52

How is fuel balancing achieved?

Answer 52

Automatically or manually

Question 53

What keeps the fuel system running once the aircraft is started?

Answer 53

Motive flow from pumps in the collector tanks

Question 54

What allows fuel flow via gravity from the main tanks to the collector tanks?

Answer 54

Flapper valve

Question 55

What pumps move fuel from the main to the collector tanks via motive flow or low pressure pump?

Answer 55

Transfer jet pumps (1 ea wing)

Question 56

Is there a backup for failure of the low pressure boost pump?

Answer 56

Yes, one of the electric fuel boost pumps

Question 57

When engine is running, what delivers fuel to the engine driven pump?

Answer 57

Delivery jet pumps

Question 58

What fuel valve would prevent the fuel inspection door from being closed?

Answer 58

Maintenance shutoff valve

Question 59

What psi causes the filter nipple to pop?

Answer 59

8 psi

Question 60

Where is the firewall shutoff valve?

Answer 60

Fuel inspection panel, LH side of AC

Question 61

If the EIS fuel gauge fails, what do you lose?

Answer 61

Fuel balancing computer

Question 62

What level triggers the fuel low level switches?

Answer 62

Below 133 lb (20 gal)

Question 63

What fuel pressure triggers a CAWS message?

Answer 63

Below 2 psi

Question 64

What provides fuel to the engine under normal conditions?

Answer 64

Low pressure fuel pump via jet pumps and motive flow

Question 65

How many fuel pumps in the system?

Answer 65

8 total 1 high pressure 1 low pressure 2 electric 2 transfer jet pumps 2 delivery jet pumps

Question 66

Where are the electric boost pumps located?

Answer 66

Collector tanks

Question 67

What are the electric fuel pump switch positions?

Answer 67

Auto and on

Question 68

What does an illuminated left or right fuel boost pump CAWS message (green) in flight indicate?

Answer 68

Fuel is being transferred from tank to tank

Question 69

What would indicate loss of the low pressure engine driven boost pump in flight?

Answer 69

Both green electric pump CAWS lights and a master caution

Question 70

With loss of the low pressure pump, what else do you lose?

Answer 70

Auto balancing

Question 71

If the low pressure pump is lost, but you need to balance fuel, how could it be accomplished?

Answer 71

Pull receiving tank CB (if directed by proceedure)

Question 72

How is contaminated fuel expelled?

Answer 72

Burned and exhausted out (?)