Flight control in yawing asymmeryDo the captain's and first officer's rudder pedals always move together?How...
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Flight control in yawing asymmery
Do the captain's and first officer's rudder pedals always move together?How does flight control surface authority change with AOA?Why not simplified fly by wire helicopter controls?How does a flight control computer deal with control surface disengagement?Can an airplane fly with on-off control surfaces?Why do aircraft have a crossover airspeed, and why does it increase at higher vertical load factors?Why does the A320 use the rudder for lateral control in mechanical law?B777- In emergency mechanical back up how does the flight controls manage engine failure
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How autopilot/pilot handles yawing asymmetry such as the one caused by failure of an engine in multi-engine turboprop where engines are mounted on sides of centerline.
In such condition, is it better to apply roll control than rudder control or vice versa.
flight-controls control-surfaces
asked 9 hours ago
hereyougo therehereyougo there
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add a comment |
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How autopilot/pilot handles yawing asymmetry such as the one caused by failure of an engine in multi-engine turboprop where engines are mounted on sides of centerline.
In such condition, is it better to apply roll control than rudder control or vice versa.
flight-controls control-surfaces
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
$endgroup$
add a comment |
$begingroup$
How autopilot/pilot handles yawing asymmetry such as the one caused by failure of an engine in multi-engine turboprop where engines are mounted on sides of centerline.
In such condition, is it better to apply roll control than rudder control or vice versa.
flight-controls control-surfaces
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
$endgroup$
How autopilot/pilot handles yawing asymmetry such as the one caused by failure of an engine in multi-engine turboprop where engines are mounted on sides of centerline.
In such condition, is it better to apply roll control than rudder control or vice versa.
flight-controls control-surfaces
flight-controls control-surfaces
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
asked 9 hours ago
hereyougo therehereyougo there
282 bronze badges
282 bronze badges
add a comment |
add a comment |
1 Answer
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The details will depend on the exact aircraft type, so I will answer for the Bombardier Dash-8 Q400 as an example.
The autopilot does not have rudder authority on the Dash-8 (source: FCOM Autoflight chapter):
12.3.7 Autopilot
The Autopilot (AP) couples the FD commands to the flight control surfaces using pitch and roll servos for automatic control of the aircraft flight path.
If not disengaged, the autopilot would try to maintain heading with roll only.
The yaw damper would not be enough to overcome the yaw asymmetry either:
12.3.9 Yaw Damper
The Yaw Damper provides through control of the rudder:
- Damping of the aircraft Dutch Roll mode.
- Turn coordination.
The Yaw Damper authority is limited to a maximum of ± 4.5 degrees of rudder by mechanical stops. Yaw Damper commands are limited in software as a function of airspeed.
The correct procedure in case of an engine failure would be to hold rudder towards the live engine and then trim the rudder whenever time permits:
(image source: FCOM Flight Controls chapter)
RUDDER TRIM INDICATOR
- indicates trimmed rudder position
RUDDER TRIM KNOB (rotary action spring loaded to neutral)
ROTATE
- trims rudder in desired direction
- first graduation trims slow, second graduation trims fast
The target for the rudder trim should be coordinated flight, i.e. no sideslip indicated on the primary flight display (PFD):
(image source: FCOM Indicating and Recording Systems chapter)
SLIP/SKID INDICATOR (white)
- the Slip/Skid Indicator shows the lateral acceleration of the aeroplane and is a trapezoid symbol. It turns with the roll pointer
- the maximum deflection indication shows a 0.14 g lateral acceleration. This is equivalent to one and a half the thickness of the upper part of the slip/skid symbol (trapezoid shape)
- the slip skid Indicator is shown to the left when the aeroplane is slipping to the right and to the right when the aeroplane is slipping to the left
- the indicator goes out of view when the aeroplane roll is more than 60 degrees or the related AHRU attitude has malfunctioned
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
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Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
add a comment |
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1 Answer
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1 Answer
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active
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$begingroup$
The details will depend on the exact aircraft type, so I will answer for the Bombardier Dash-8 Q400 as an example.
The autopilot does not have rudder authority on the Dash-8 (source: FCOM Autoflight chapter):
12.3.7 Autopilot
The Autopilot (AP) couples the FD commands to the flight control surfaces using pitch and roll servos for automatic control of the aircraft flight path.
If not disengaged, the autopilot would try to maintain heading with roll only.
The yaw damper would not be enough to overcome the yaw asymmetry either:
12.3.9 Yaw Damper
The Yaw Damper provides through control of the rudder:
- Damping of the aircraft Dutch Roll mode.
- Turn coordination.
The Yaw Damper authority is limited to a maximum of ± 4.5 degrees of rudder by mechanical stops. Yaw Damper commands are limited in software as a function of airspeed.
The correct procedure in case of an engine failure would be to hold rudder towards the live engine and then trim the rudder whenever time permits:
(image source: FCOM Flight Controls chapter)
RUDDER TRIM INDICATOR
- indicates trimmed rudder position
RUDDER TRIM KNOB (rotary action spring loaded to neutral)
ROTATE
- trims rudder in desired direction
- first graduation trims slow, second graduation trims fast
The target for the rudder trim should be coordinated flight, i.e. no sideslip indicated on the primary flight display (PFD):
(image source: FCOM Indicating and Recording Systems chapter)
SLIP/SKID INDICATOR (white)
- the Slip/Skid Indicator shows the lateral acceleration of the aeroplane and is a trapezoid symbol. It turns with the roll pointer
- the maximum deflection indication shows a 0.14 g lateral acceleration. This is equivalent to one and a half the thickness of the upper part of the slip/skid symbol (trapezoid shape)
- the slip skid Indicator is shown to the left when the aeroplane is slipping to the right and to the right when the aeroplane is slipping to the left
- the indicator goes out of view when the aeroplane roll is more than 60 degrees or the related AHRU attitude has malfunctioned
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
$endgroup$
$begingroup$
Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
add a comment |
$begingroup$
The details will depend on the exact aircraft type, so I will answer for the Bombardier Dash-8 Q400 as an example.
The autopilot does not have rudder authority on the Dash-8 (source: FCOM Autoflight chapter):
12.3.7 Autopilot
The Autopilot (AP) couples the FD commands to the flight control surfaces using pitch and roll servos for automatic control of the aircraft flight path.
If not disengaged, the autopilot would try to maintain heading with roll only.
The yaw damper would not be enough to overcome the yaw asymmetry either:
12.3.9 Yaw Damper
The Yaw Damper provides through control of the rudder:
- Damping of the aircraft Dutch Roll mode.
- Turn coordination.
The Yaw Damper authority is limited to a maximum of ± 4.5 degrees of rudder by mechanical stops. Yaw Damper commands are limited in software as a function of airspeed.
The correct procedure in case of an engine failure would be to hold rudder towards the live engine and then trim the rudder whenever time permits:
(image source: FCOM Flight Controls chapter)
RUDDER TRIM INDICATOR
- indicates trimmed rudder position
RUDDER TRIM KNOB (rotary action spring loaded to neutral)
ROTATE
- trims rudder in desired direction
- first graduation trims slow, second graduation trims fast
The target for the rudder trim should be coordinated flight, i.e. no sideslip indicated on the primary flight display (PFD):
(image source: FCOM Indicating and Recording Systems chapter)
SLIP/SKID INDICATOR (white)
- the Slip/Skid Indicator shows the lateral acceleration of the aeroplane and is a trapezoid symbol. It turns with the roll pointer
- the maximum deflection indication shows a 0.14 g lateral acceleration. This is equivalent to one and a half the thickness of the upper part of the slip/skid symbol (trapezoid shape)
- the slip skid Indicator is shown to the left when the aeroplane is slipping to the right and to the right when the aeroplane is slipping to the left
- the indicator goes out of view when the aeroplane roll is more than 60 degrees or the related AHRU attitude has malfunctioned
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
$endgroup$
$begingroup$
Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
add a comment |
$begingroup$
The details will depend on the exact aircraft type, so I will answer for the Bombardier Dash-8 Q400 as an example.
The autopilot does not have rudder authority on the Dash-8 (source: FCOM Autoflight chapter):
12.3.7 Autopilot
The Autopilot (AP) couples the FD commands to the flight control surfaces using pitch and roll servos for automatic control of the aircraft flight path.
If not disengaged, the autopilot would try to maintain heading with roll only.
The yaw damper would not be enough to overcome the yaw asymmetry either:
12.3.9 Yaw Damper
The Yaw Damper provides through control of the rudder:
- Damping of the aircraft Dutch Roll mode.
- Turn coordination.
The Yaw Damper authority is limited to a maximum of ± 4.5 degrees of rudder by mechanical stops. Yaw Damper commands are limited in software as a function of airspeed.
The correct procedure in case of an engine failure would be to hold rudder towards the live engine and then trim the rudder whenever time permits:
(image source: FCOM Flight Controls chapter)
RUDDER TRIM INDICATOR
- indicates trimmed rudder position
RUDDER TRIM KNOB (rotary action spring loaded to neutral)
ROTATE
- trims rudder in desired direction
- first graduation trims slow, second graduation trims fast
The target for the rudder trim should be coordinated flight, i.e. no sideslip indicated on the primary flight display (PFD):
(image source: FCOM Indicating and Recording Systems chapter)
SLIP/SKID INDICATOR (white)
- the Slip/Skid Indicator shows the lateral acceleration of the aeroplane and is a trapezoid symbol. It turns with the roll pointer
- the maximum deflection indication shows a 0.14 g lateral acceleration. This is equivalent to one and a half the thickness of the upper part of the slip/skid symbol (trapezoid shape)
- the slip skid Indicator is shown to the left when the aeroplane is slipping to the right and to the right when the aeroplane is slipping to the left
- the indicator goes out of view when the aeroplane roll is more than 60 degrees or the related AHRU attitude has malfunctioned
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
$endgroup$
The details will depend on the exact aircraft type, so I will answer for the Bombardier Dash-8 Q400 as an example.
The autopilot does not have rudder authority on the Dash-8 (source: FCOM Autoflight chapter):
12.3.7 Autopilot
The Autopilot (AP) couples the FD commands to the flight control surfaces using pitch and roll servos for automatic control of the aircraft flight path.
If not disengaged, the autopilot would try to maintain heading with roll only.
The yaw damper would not be enough to overcome the yaw asymmetry either:
12.3.9 Yaw Damper
The Yaw Damper provides through control of the rudder:
- Damping of the aircraft Dutch Roll mode.
- Turn coordination.
The Yaw Damper authority is limited to a maximum of ± 4.5 degrees of rudder by mechanical stops. Yaw Damper commands are limited in software as a function of airspeed.
The correct procedure in case of an engine failure would be to hold rudder towards the live engine and then trim the rudder whenever time permits:
(image source: FCOM Flight Controls chapter)
RUDDER TRIM INDICATOR
- indicates trimmed rudder position
RUDDER TRIM KNOB (rotary action spring loaded to neutral)
ROTATE
- trims rudder in desired direction
- first graduation trims slow, second graduation trims fast
The target for the rudder trim should be coordinated flight, i.e. no sideslip indicated on the primary flight display (PFD):
(image source: FCOM Indicating and Recording Systems chapter)
SLIP/SKID INDICATOR (white)
- the Slip/Skid Indicator shows the lateral acceleration of the aeroplane and is a trapezoid symbol. It turns with the roll pointer
- the maximum deflection indication shows a 0.14 g lateral acceleration. This is equivalent to one and a half the thickness of the upper part of the slip/skid symbol (trapezoid shape)
- the slip skid Indicator is shown to the left when the aeroplane is slipping to the right and to the right when the aeroplane is slipping to the left
- the indicator goes out of view when the aeroplane roll is more than 60 degrees or the related AHRU attitude has malfunctioned
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
edited 7 hours ago
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
answered 7 hours ago
BianfableBianfable
4,73118 silver badges40 bronze badges
4,73118 silver badges40 bronze badges
$begingroup$
Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
add a comment |
$begingroup$
Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
$begingroup$
Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
$begingroup$
Excellent answer. I will just add that in an engine out scenario you actually want the ball just about a half ball out for the least drag.
$endgroup$
– Michael Hall
33 mins ago
add a comment |
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