Chapter A08 - Trim, Yaw Damper and Flight Envelope Protection

Question 1

Pitch down moment as you approach the ?

Answer 1

Speed of sound - Known as mach tuck

Question 2

Mach Trim

Always _____ – not pilot controlled.

Can be an independent system. Prevents _____ at high speeds.

Answer 2

• engaged, automatic
• Mach Tuck, or ‘Tuck Under’

Question 3

A yaw damper as a type of stability augmentation system which

Answer 3

counteracts Dutch Roll,

Question 4

It is mandatory on some aircraft for the yaw damper to be serviceable before

Answer 4

dispatch as flight without the system would be deemed unsafe.

Question 5

Y/D moves the rudder in proportion to the

Answer 5

angular rate of yaw

Question 6

ADC provides speed information to the Y/D computer so that

Answer 6

correct rudder inputs are calculated (high speed = less rudder input)

Question 7

Most modern A/C have a main Y/D system and a standby system for

Answer 7

redundancy

Question 8

The Y/D does not

Answer 8

balance turns

Question 9

Pilot sees Parallel -

Answer 9

Parallel system - Autopilot moves the controls are you can see it

Question 10

Series Yaw Dampers use ?

Answer 10

Y/D channel separate from rudder channe

Question 11

Stable Dutch roll looks like?

Answer 11

Question 12

Neutral dutch roll looks like?

Answer 12

Question 13

Unstable dutch roll looks like?

Answer 13

Question 14

Yaw damper controls and indicators

Y/D switched on/off with a ____

Indicator swings _____ to show
rudder inputs made by Y/D system

Answer 14

• switch
• L and R

Question 15

Yaw damper acts on?

Answer 15

Rudder only

Question 16

How does Yaw damper detect yaw?

Answer 16

Rate gyro, IRS or accelerometer

Question 17

The yaw damper system sends a motion order to the rudder if the yawing rate of the aircraft:

Answer 17

Is not constant

Question 18

An aircraft is turning right, with too much bank (slipping turn). The yaw damper system…

Answer 18

Is not designed to provide a balanced turn.

Question 19

When available, the yaw damper indicator supplies the pilot with information regarding the…

Answer 19

Yaw damper action on the rudder

Question 20

What are the advantages of FBW?

Answer 20

Weight saving
Reduced maintenance costs

Flight Envelope protection
Improved handling
Fuel saving
Gust load alleviation

Question 21

A control law is how the

Answer 21

pilot’s control movements are translated into control surface movements

Question 22

In a FBW system, the aircraft can only manoeuvre within the

Answer 22

flight envelope and protection prevents the envelope being violated during extreme situations such as windshear and TCAS avoidance.

Question 23

Typical inputs into the Flight
Envelope Protection system include:

Answer 23

• AoA (α or alpha)
• Air speed
• Aircraft configuration
• Attitude
• G reading

Question 24

The flight envelope protection system provides protection from exceeding:

Answer 24

• AoA (α or alpha)
• High/low speed
• Pitch attitude
• Bank angle
• Load factor

Question 25

On a modern large transport aircraft, regarding fly-by-wire and FMS:

Answer 25

Fly-by-wire software is qualified to a higher standard than the FMS software.

Question 26

The auto-trim function in a non-fly by wire aircraft:

Answer 26

Ensures no snatch on disengagement of the AP, and keeps the elevators in a neutral position relevant to the horizontal stabiliser.