11.5.5- Avionics- Auto Flight

Question 1

What is flight envelope protection?

Answer 1

Monitors the operation of all modern auto flight systems to prevent any abnormal conditions.

Question 2

What does FMGEC stand for?

Answer 2

Flight management guidance and envelope computer.

Question 3

Compared to a human reaction time of 0.8s how quickly can the autopilot correct?

Answer 3

50 milliseconds

Question 4

What function is part of the inner loop?

Answer 4

Stabilisation from the vertical gyro input.

Question 5

What is a duplex system?

Answer 5

A three-channel autopilot that has an individual ‘pitch’, ‘roll’, and ‘yaw’ channel, each with its control loop where each axis is a channel.

Question 6

What is a triplex system?

Answer 6

A three-channel autopilot that has an ‘A’, ‘B’, or ‘C’ lane with voted output, meaning each AP computer has its ‘pitch’ ‘roll’ and ‘yaw’ axis as a channel.

Question 7

What does the term lane apply too?

Answer 7

Autopilot systems that are integrated into a flight control module.

Question 8

How does a triplex identify faults or incorrect inputs?

Answer 8

Comparators monitoring all three outputs. Any variation is then fed to a voting system to decide which lane is at fault.

Question 9

What type of system does a basic autopilot use?

Answer 9

Closed loop servo system.

Question 10

What is the inner loop sometimes referred too as?

Answer 10

Control loop

Question 11

What does SAS stand for?

Answer 11

Stability Augmentation System

Question 12

To change altitude by 1000ft in 120s what rate of climb must you select?

Answer 12

500 feet per minute

Question 13

What is VNAV mode?

Answer 13

Vertical navigation

Question 14

How is the glideslope signal transmitted?

Answer 14

UHF 329.3 to 335.0 MHz

Question 15

What does LOC mode do?

Answer 15

Localiser- allows the A/P to provide left/right guidance along the centre line of the runway.

Question 16

What is the localiser mode divided into?

Answer 16

Intercept
Capture on course
Approach on course

Question 17

What does the Lateral Navigation mode use (LNAV)?

Answer 17

FMS

Question 18

What two systems are under autothrottle?

Answer 18

Auto throttle
Auto thrust

Question 19

What is auto throttle?

Answer 19

Autothrottle physically move throttle levers, and their signals or cables move the throttles on the engines.

Question 20

What is auto thrust?

Answer 20

A digital signal directly to the Full Authority Digital Engine Control (FADEC) computer of the engine. The system’s thrust levers do not move

Question 21

What speed is the common throttle hold?

Answer 21

80kt

Question 22

When is go around mode activated?

Answer 22

When auto throttle is engaged and the radio altitude is less than 2000ft

Question 23

What is fail operational of the auto land system?

Answer 23

Overall system still functioning and not cause a downgrading of performance beyond the limits required for automatic landing.

Question 24

What is the fail passive of the auto land system?

Answer 24

System can withstand failure without endangering the safety or deviating excessively from the flight path.

Question 25

What is the dual dual system?

Answer 25

Commonly used on smaller passenger aircraft. It involves a two-computer, twin-channel autopilot where three of four channels are normally used to provide the required redundancy.