Engines

Question 1

Engine Nomenclature

Answer 1

Roll Royce Trent 892

Question 2

Engine Description

Answer 2

• Three rotor
• Axial flow turbofans
• High compression
• High bypass ratio

Question 3

Describe the N1 rotor

Answer 3

• Low pressure compressor section
• Low pressure turbine section
• On a common shaft

Question 4

Describe the N2 rotor

Answer 4

• Intermediate pressure section
• Intermediate pressure turbine
• On a common shaft

Question 5

Describe the N3 rotor

Answer 5

• High pressure compressor section
• High pressure turbine section
• On a common shaft
• Drives the engine accessory gearbox

Question 6

What are the primary engine indications?

Answer 6

• EPR
• N1
• EGT

Question 7

What are the secondary engine indications?

Answer 7

• N2
• N3
• Fuel flow
• Oil pressure, temperature, quantity
• Engine vibration

Question 8

Describe EEC

Answer 8

• Dual channel
• Has full authority over its respective engine’s operation
• Uses thrust lever inputs to automatically control forward and reverse thrust

Question 9

What are the two control modes of the EEC?

Answer 9

• NORM
• ALTN

Question 10

How does the EEC set thrust in the NORM mode?

Answer 10

By controlling EPR based on thrust lever position

Question 11

When does the EEC switch to soft alternate mode?

Answer 11

Automatically when required signals are not available to operate in the normal mode

Question 12

How does the EEC set thrust in ALTN mode?

Answer 12

By scheduling N1 as a function of thrust lever position

Question 13

What are the two alternate modes of the EEC?

Answer 13

• Soft
• Hard

Question 14

What may happen when hard ALTN is selected?

Answer 14

Thrust may change to set the commanded N1

Question 15

What protection is not provided in the ALTN modes?

Answer 15

Thrust protection

Question 16

What protection is provided by the EEC in both NORM and ALTN modes?

Answer 16

N1, N2, N3 redline overspeed protection

Question 17

What does the EEC command if N1, N2, N3 approaches overspeed?

Answer 17

Reduced fuel flow

Question 18

What does the FUEL CONTROL and ENGINE FIRE switches control?

Answer 18

Fuel spar valve

Question 19

What does the engine’s oil system provide?

Answer 19

High pressure oil for cooling and lubricating the main bearings, gears, and the accessory drive unit

Question 20

Where is oil pressure measured?

Answer 20

Prior to entering the engine

Question 21

Where is oil temperature measured?

Answer 21

After leaving the engine

Question 22

What are the three bleed air sources for starting the engine?

Answer 22

• APU
• High pressure ground air
• The other engine, if it’s running

Question 23

How long must the engines be warmed up before applying takeoff power if they have been shut down for up to 1.5 hours?

Answer 23

3 minutes

Question 24

How long must the engines be warmed up before applying takeoff power if they have been shut down for over 1.5 hours?

Answer 24

5 minutes

Question 25

What happens when the AUTOSTART switch is ON and FUEL CONTROL switch is in the RUN position?

Answer 25

- Spar valve opens - Engine fuel valve arms - The selected igniter arms

Question 26

What is not monitored by the AUTOSTART system?

Answer 26

- Oil pressure - Oil temperature

Question 27

What malfunctions will the AUTOSTART system make a 2nd start attempt for?

Answer 27

- Hot start - Hung Start - No EGT rise - Compressor stall “ Hot, hung, no, bang”

Question 28

On the ground, what malfunctions will the AUTOSTART system NOT make a 2nd start attempt for?

Answer 28

- Starter shaft fails - Insufficient air pressure - No N1 rotation - Start time exceeds the starter duty cycle - Start is aborted above starter cutout speed “SANDE”

Question 29

What does the EEC activate the auto relight function for?

Answer 29

- Engine flameout protection - Rain and hail ingestion

Question 30

When is the auto relight function activated?

Answer 30

- When an engine is at or below idle with the FUEL CONTROL SWITCH set to RUN - When excessive rain or hail is ingested

Question 31

When does the EEC disables the auto relight function?

Answer 31

- If engine does not recover and N3 drops below 35% - Fuel and ignition are also shut off

Question 32

What are the three EEC Idle Modes?

Answer 32

- Minimum - Intermediate - Approach

Question 33

When is Minimum Idle Mode commanded by the EEC?

Answer 33

During ground operations

Question 34

When is the Intermediate Idle mode commanded by the EEC?

Answer 34

When the landing gear is in the DN position

Question 35

When is the Approach Idle Mode commanded by the EEC?

Answer 35

- When flaps are commanded to 25 or greater - When engine anti-ice is in use - When one hydraulic air-driven demand pump is inoperative with flaps out of the UP position - When the opposite engine bleed air valve is closed Note: Approach Idle decreases acceleration time in the event of a Go-Around

Question 36

What happens when the thrust reverse levers are at the interlock position?

Answer 36

- Autothrottle disengages - Auto speed brakes deploy if not previously armed