Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

C680 > Powerplant > Flashcards

Powerplant Flashcards

1
Q

Overview 1

A

The Citation Soverign has two rear mounted Pratt and Whitney PW306 engines.

The PW306C engines are high bypass ratio turbofan engines that develop 5770 pounds of thrust at sea level to 31 degrees celcius.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Overview 2

A

Each engine is controlled by a dual channel full authority digital electronic control (FADEC) unit on each engine.

A forced mixer exhaust nozzle reduces noise levels and increases performance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Overview 3

A

The PW306C is a twin spool, FADEC controlled turbofan engine.

An inner shaft (N1) consists of a fan assembly that is driven by a three stage low pressure (LP) turbine.

The outer shaft (N2) consists of four axial stages and one centrifugal stage of the compressor driven by a two stage high pressure (HP) turbine.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Where are all engine driven accessories found?

A

On the accessory gearbox.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What drives the accessory gearbox?

A

A direct drive tower shaft geared to the N2 section drives the accessory gearbox.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The compressor bleed-off valves prevent compressor surge and stall during? (3)

A
  1. Start.
  2. Low-rpm operations.
  3. During transient power conditions.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do the compressor bleed-off valves prevent compressor surge and stall?

A

The solenoid operated valves allow compressor air into the bypass ducts.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How many bleed-off valves are there?

A

Four.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What controls the bleed-off valves?

A

The FADEC.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What systems are driven by the accessory gearbox? (6)

A
  1. Starter-generator.
  2. Oil pumps.
  3. Alternator.
  4. PMA.
  5. Fuel pump.
  6. Hydraulic pump.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When the ignition toggle switch is in the ON position, what happens?

A

Continuous ignition is selected.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

When the ignition toggle switch is in the OFF position, what happens?

A

All power is removed from the exciter boxes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When the ignition toggle switch is in the NORM position, what happens?

A

The FADEC has control of the ignition operation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When will you see the following CAS message displayed, ENGINE CONTROL FAULT?

A

When the ignition toggle switch is not in the NORM position.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Engine sync button.

A

During flight with the landing gear up, throttles above idle and below the TO detent, and the ENGINE SNYNC button in NORM, the left and right FADECs continuously monitor and adjust the engines to match.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

L and R Engine start buttons.

A

Engine start is initiated by pressing the ENGINE START button.

When the respective start relay is closed, the button illuminates.

At 44% N2, the relay opens and the button extinguishes.

17
Q

Start disengage button.

A

This button illuminates when the START button is pressed and extinguishers at 44% N2.

It is used to terminate a start or to open the start relay if it fails to open during start.

18
Q

What does the pilot event marker do?

A

It allows the pilot to record engine parameters into EDU memory in the event of abnormal engine operation.

Pressing the button momentarily records a 5 minute trace.

4 mins prior and 1 min after activation.

19
Q

Describe the ENGINE OIL SYSTEM.

A

The oil system consists of an oil filter and tank, a pressure pump, scavenge pumps, and a fuel/oil heat exchanger.

Oil passes through the fuel oil heat exchanger and is sent to the No1, No2, No3, and No4 bearings and the N2 tower shaft brushing.

20
Q

OIL FILTER BYPASS VALVE

A

If the oil filter becomes contaminated, restricting the flow of oil through the filter, a bypass valve opens, allowing unfiltered oil to flow to the engine.

The OIL FILTER BYPASS CAS message is displayed on the EICAS, indicating an impending bypass situation.

For extremely low oil temperatures during engine starts, the CAS message is inhibited.

21
Q

OIL PRESSURE TRANSDUCER

A

A pressure transducer and differential pressure switch monitor oil pressure.
The transducer provides input to the EICAS for analog indication.
The differential pressure switch activates a red CAS message OIL PRESSURE LOW L-R and illuminates the L-R OIL PRESS annunciator if oil pressure drops below 20 psi.

22
Q

Where is the fuel from the tanks delivered?

A

To the HFCU, HYDROMECHANICAL FUEL CONTROL UNIT.

23
Q

Where is HFCU found?

A

On the accessory gearbox.

24
Q

Describe the journey of the fuel.

A

From the fuel tank it’s sent to a HOPPER TANK; then through the FIREWALL SHUTOFF VALVE, PRESSURE SWITCH, LOW PRESSURE ENGINE FUEL PUMP, FUEL OIL HEAT EXCHANGER, HIGH PRESSURE ENGINE FUEL PUMP, HFCU, FUEL FLOW TRANSDUCER, FUEL NOZZLES.

25
Q

What happens when the fuel filter becomes blocked?

A

A bypass valve opens, allowing fuel to bypass the filter.

26
Q

What type of switch triggers the amber CAS message: FUEL FILTER BYPASS L-R?

A

A differential pressure switch.

27
Q

Where does the fuel go once it passes through the filter?

A

From the fuel filter, the fuel enters an HP boost pump, boosting the pressure for atomization in the fuel nozzles.

28
Q

What other functions does the HFCU perform?

A

The HFCU also provides HP fuel for motive flow, engine starting and shutdown, and controls thrust, idle speed, acceleration, deceleration, and variable guide vane positioning.

29
Q

What does the waste fuel ejector do?

A

It collects and stores fuel from the fuel manifold at engine shutdown.

30
Q

What happens to the fuel collected by the waste fuel ejector?

A

On subsequent engine operations, an ejector pump draws fuel from the waste tank and returns it to the fuel pump.

31
Q

EMERGENCY FUEL SHUTOFF VALVE

A

A mechanical emergency fuel shutoff valve provides a means of automatic engine shutdown in the event of an N1 shaft failure.
A plunger at the rear of the N1 shaft senses movement of the shaft and causes the shutoff valve to close and stop fuel flow to the fuel manifold.

32
Q

Describe the thrust reversers.

A

They are clam shell type reversers.

They are electrically controlled and hydraulically operated.

33
Q

When can the thrust reversers be deployed?

A

Any time all three squat switches are on the ground.

34
Q

What happens when the Thrust reverser EMERGENCY STOW BUTTONS are pressed?

A

Pressing the button opens the isolation valve and directs the control valve to the stow position.

C680 (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions