Thrust Management System & Autothrottle

Question 1

What components make up the Thrust Management System?

Answer 1

AUTOTHROTTLE
Thrust Rating System (TRS)
Thrust Lever Angle (TLA) Trim

Question 2

What is the purpose of the thrust Management System?

Answer 2

Controls aircraft speed and thrust, helping to reduce fuel consumption and increase engine service life by limiting thrust, speed and temperature according to the phase of flight

Question 3

How many Autothrottle modes are there and what are they?

Answer 3

TO - Take off
HOLD - Hold
SPD T - Speed on Thrust
SPD E - Speed on Elevator
GA - Go Around
RETD - Retard
LIM - Limited Thrust
OVRD - Override

Question 4

When happens to the Autothrottle if an engine fails?

Answer 4

Autothrottle deactivates the respective thrust lever ONLY

Question 5

What does the Autothrottle do?

Answer 5

Moves the thrust levers to maintain the desired airspeed or set the correct engine thrust according to the relevant mode

Question 6

When does the Autothrottle engage ON GROUND?

Answer 6

Autothrottle Button Pressed
NO FAILURE
BOTH Thrust Levers advanced beyond 50°

Question 7

When does the Autothrottle engage IN FLIGHT?

Answer 7

Autothrottle Button Pressed
NO FAILURE
Airplane at or above 400ft AGL

Question 8

For the Autothrottle to remain engaged the thrust levers must:

Answer 8

Not be misaligned more than 8° (HALF a Thrust Lever Head)

Question 9

When does the Autothrottle normally disengage? (Manually & Automatically)

Answer 9

Manually:
Disconnect Button pressed on the Thrust Levers
Autothrottle Butto Pressed

OR

Automatically:
After Touchdown
Reverse Thrust Operation (RTO)
Thrust Levers beyond the TO/GA position

Question 10

What Annunciations are seen/heard when the Autothrottle disengages in a normal situation?

Answer 10

AUTOTHROTTLE Voice
AT FMA Annuncation Flashes GREEN for 5 seconds

Question 11

When is the Autothrottle Disengaged in a non normal situation?

Answer 11

Thrust Levers (TLA) misaligned more than 8°
Autothrottle Failure

Question 12

What Annunciations are seen/heard when the Autothrottle disengages in a non-normal situation?

Answer 12

AUTOTHROTTLE Voice
AT FMA Annuncation Flashes RED
EICAS Message AT FAIL

Question 13

What Protection is there for the Autothrottle?

Answer 13

Low Speed Protection

Question 14

What is SPD T Mode & When is it used?

Answer 14

System controls the Selected Airspeed by adjusting the engine thrust

Used when the Flight Director Mode is turned OFF

Question 15

What is the purpose of the Autothrottle HOLD Mode and what does it do?

Answer 15

Prevents undesired thrust lever movement during the take off phase by ensuring that thrust lever movements are not commanded up to 400ft AGL

Question 16

When is Autothrottle HOLD mode engaged?

Answer 16

At 60kts + during the Take off Roll

Question 17

When is Autothrottle HOLD mode engaged until?

Answer 17

400ft AGL

Question 18

When is GO Around Autothrottle Mode used?

Answer 18

When the Thrust Levers are advanced to TO/GA Position

Question 19

When is Autothrottle RTD Mode ARMED?

Answer 19

RAD ALT 150ft AGL & VALID
Slats/Flaps 5 or FULL & Gear Down
Autothrottle Engaged

Question 20

When is Autothrottle RTD mode Engaged?

Answer 20

At or below 30ft

Question 21

What does the Autothrottle RTD mode do?

Answer 21

Reduce the Thrust levers to idle during Flare on Landing

Question 22

When is LIM displayed on the FMA?

Answer 22

When the Autothrottle Authority is NOT sufficient to achieve or maintain the selected airspeed

Question 23

How can you override the Autothrottle without disengaging it and what will be displayed?

Answer 23

Move the thrust levers
GREEN OVRD will display on the FMA
When Thrust Levers are released, Autothrottle controls the Thrust Levers

Question 24

When is Autothrottle TO mode engaged?

Answer 24

When the Thrust Levers are advanced 50°+

Question 25

What is SPD E Autothrottle Mode?

Answer 25

Autothrottle maintains a fixed thrust setting and the Flight Director adjusts the pitch to maintain the selected airspeed

Question 26

What is the purpose of the Thrust Rating System?

Answer 26

Determines the appropriate thrust rating (N1 Upper limit) based on the phase of flight

Question 27

Where is the active thrust rating displayed?

Answer 27

On the EICAS between both Eng N1 Indicators

Question 28

How are Thrust Ratings Selected?

Answer 28

TRS PAGE on the MCDU

Question 29

What is the difference between CLB-1 & CLB-2?

Answer 29

CLB-1 > Highest Thrust CLB-2 > Reduced Thrust

Question 30

When are you able to manually select CLB-2 instead of CLB-1?

Answer 30

When the TO-X Thrust Rating is HIGHER than the CLB-1 Thrust Rating

Question 31

When is CLB-1(2) engaged with Flight Directors ON?

Answer 31

Landing Gear Retracted Altitude above 400ft AGL

Question 32

When is CLB-1(2) engaged with Flight Directors OFF?

Answer 32

Landing Gear Retracted Altitude above 3000ft AGL

Question 33

When is CLB-1(2) engaged IN FLIGHT?

Answer 33

Whenever the altitude sector is set to an altitude higher than the current aircraft altitude

Question 34

Whwn is CRUISE Thrust Rating Engaged?

Answer 34

When the Aircraft has been levelled off at the altitude set for 90 seconds

Question 35

When is CON Thrust Rating used?

Answer 35

IN FLIGHT when OEI During Takeoff at 3000ft AGL if OEI

Question 36

What is TLA Trim?

Answer 36

Syncs Engine N1 when the Autothrottle is disengaged

Question 37

When is the TLA Trim Automatically ON?

Answer 37

Whenever the Autothrottle is disengaged