Questions tagged [flight-controls]

The methods or mechanisms used to control an aircraft's movements in roll, pitch, and yaw.

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1answer
130 views

Are electromechanical actuators used in aircraft other than the Boeing 787?

Are there any large (non-experimental) civil or military aircraft that use electromechanical actuators (EMA), other than the Boeing 787?
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107 views

What 's the difference between Angle of Attack and Pitch? [duplicate]

I am interested in knowing the theoretical and practical differences between the Angle of Attack (AoA) and Pitch: Graphical definitions How are they related? In what circumstances these angles are ...
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0answers
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Do the F/A-18 primary control actuators have an ECU? [closed]

Do the F/A-18 primary control actuators have an electronics control unit (ECU)? If they do, which control loop is closed by the ECU and which one with the flight control computer?
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1answer
137 views

Where do the forces exerted on flight yoke/stick comes from and how do they vary with flight conditions?

What are the forces felt on the flight yoke/stick based on the deflection of control surfaces and the aerodynamic forces acting on the control surfaces with respect to different aircraft attitudes? ...
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0answers
75 views

what are the no load rates of f-16 control surfaces?

What are the no-load rates for the control surfaces of f-16 like flaperon,leading edge flap and horizontal and vertical stabs?
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1answer
191 views

Is it true pilots in a smaller aircraft have the option of using the right or left door as rudder, to offset the actual rudder if failed? [duplicate]

So if the rudder fails or gets stuck in the “left” position a pilot could open the right door and it would essentially counter the effect?
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4answers
137 views

Could Henri Farman have steered his plane with ailerons on January 13, 1908?

It is known that Henri Farman flew (over) 1 km in a circuit on January 13, 1908, and gained a 50000-franc prize. Orville Wright even witnessed Farman on November 18, 1907, attempting to make the full ...
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3answers
318 views

Did Boeing need MCAS because the 737 MAX didn’t meet FAA longitudinal stability requirements, or was it to make the MAX feel like the NG?

I’m confused on this. I’ve read in multiple different places that MCAS was required due to the easier stick forces at a high angle of attack and a high G force, and because of this, the Max didn’t ...
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1answer
103 views

How did the Brazilian Civil Aviation Authority have MCAS on paper from Jan 2018?

how could they know but nobody else did? Did they buy the extra sensor or something?
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1answer
106 views

Why A320/330 use C* FBW control without speed stability?

The A320 and A330 family are FBW aircraft that use C* longitudinal control laws for longitudinal sidestick command tracking. In essence, stick neutral commands 1G flight. When stick is deflected ...
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2answers
143 views

What hardware standards should the flight control computer pass?

There are some standards for each part of the aircraft like actuators, sensors,... I could not find one for the flight control computer hardware. For example what are the environmental tests, or any ...
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2answers
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Why does the stick force per-g test require it to be harder for pilots to pull back on the yoke instead of easier?

What happens when it’s easier to pull back banked at such steep angles, wouldn’t it be a good thing that a pilot can maintain his altitude easier than harde?
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Does the SAS (stability augmentation system) actuators of f-14 use jet-pipe or flapper-nozzle technology?

F-14 uses electrohydraulic servo actuators for its SAS. What type of hydraulic amplification is used in F-14? jet-pipe, flapper-nozzle or something else?
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1answer
125 views

How many actuators does the F-35 have for each primary control surface?

How many actuators does the F-35 have for each primary control surface like rudder, stabilator or aileron? And is it active/active or active/standby?
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53 views

What factors should be considered to select jet-pipe or flapper-nozzle technology for a primary control surface?

How is the servovalve mechanism chosen between these two mechanisms? what are their advantages and drawbacks?
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2answers
149 views

How is the bandwidth of an actuator selected for a primary flight control surface?

How the bandwidth of an actuator is selected for a primary flight control surface? Is there any standard? Based on what factors this decision is made?
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3answers
253 views

If the pilots used the brakes upon landing, would the force essentially slam the front wheel down?

So if the pilots braked immediately, with only the back wheels down, and nose wheel still up, would the force from braking cause the front wheel to come slamming down?
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1answer
76 views

How should the maximum output force of the actuator be chosen?

If the hinge moments of the control surfaces of an aircraft are given, how should the maximum output force of the actuator be chosen? Is there any standard or reference?
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2answers
1k views

How do A320 pilots trim?

So, I am very familiar with the 737NG, and there is a trim switch on the yoke for vertical trim. However, I can't seem to locate this trim switch in the A320. Is there a trim switch on the joystick in ...
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5answers
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How do planes maintain constant speeds at cruise altitudes?

I'm a noob so pardon my ignorance. So my understanding is that as the plane gets lighter during the flight, its mass reduces therefore reducing the lift needed to maintain the altitude. At those ...
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3answers
272 views

Why is the 707’s yaw-damper-out lateral controllability marginal to nonexistent with flaps and spoilers extended?

According to the NTSB report on the 1973 crash of Pan Am Flight 160, the 707-300C1 has lateral controllability characteristics ranging from “minimal” to “none” if the flaps and spoilers are extended ...
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6answers
9k views

Is it possible to stall a plane so badly that the nose refuses to go down due to lack of airspeed?

So basically, a stall from a high AoA to the point that the entire plane just falls with the rear end pointing straight down? Because if wind is no longer passing over the wings, then this includes ...
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3answers
186 views

Is the point of “groundspeed” in aircraft just to have a second reference of speed but two totally different measurements of speed? [duplicate]

From not understanding groundspeed will always be significantly higher than airspeed, unless the plane is pitching up and down. Is the ground speed just there for pilots to look at and say “okay we ...
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2answers
117 views

Does the AP disengage if the plane is upset and how would the flight controls react if not being held?

Does the AP (autopilot) essentially detect a rapid change in speed/altitude as a wild maneuver? If so, upon disengaging, if the pilots are not holding the control column in a neutral position, will it ...
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1answer
106 views

What is the difference between a loss of control and an upset?

What is the difference between a loss of control and an upset? From what I have read, first, an upset occurs, which leads to a loss of control (LOC). But, when can one say that the upset has been ...
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0answers
42 views

Is there a general standard for servo actuators?

It is said in the standard AS94900 that the standard ARP490 should be considered for the actuators of the control surfaces in the aircraft. However, this standard is on servo valves and not servo ...
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0answers
234 views

Why does the KC-46 use an MCAS?

The KC-46 tanker aircraft (the U.S. military's designation for the 767s it uses as tankers, and which every other country calls the KC-767) uses an early version of an MCAS.1 This was ostensibly ...
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103 views

The F16 stick movement is little. But how? [duplicate]

The F16 stick movement is very little, is 1/8inch. So there is just a stop point at the end of the movement, or the stick is hard all the time, but move a bit ? There is increase in stiffness to ...
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1answer
91 views

How is the FPA (flight-path-angle) computed?

How is FPA computed by the Auto-pilot to follow the desired FPA? One part is clearly VS, is the other part IAS or Ground speed? Where does Ground speed come from?
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1answer
751 views

What is the difference between a trim tab and a servo tab?

They both seem very similar but can someone please explain their main differences and principle of operation?
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1answer
143 views

What does “wraparound” mean in the context of flight controls?

In the references regarding the flight control (for example in F-16) I see the word "wraparound". For example "Rudder coil wraparound", "IBU pitch wraparound", "IBU lateral wraparound"or "AMUX bus ...
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4answers
158 views

Is there an in-flight built-in-test in an airplane? [closed]

Is there any in-flight built-in-test in the airplanes separate from the in-flight monitoring?
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4answers
106 views

Can airflow reverse over the flight surfaces of a uav in high wind conditions

Can airflow reverse over the wing of a uav in high tail winds and low forward airspeed i.e 25knt fwd airspeed in a 35 knt tailwind? What would be the overall effect on the elevator and rudder? I ...
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0answers
76 views

What is the selection algorithm in f-16 stick LVDT?

In a reference: https://www.nasa.gov/centers/dryden/pdf/88102main_H-1344.pdf page 67 (71 of pdf file) in Table 12, it is said that the signal selection algorithm from the redundant LVDT of stick in f-...
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1answer
88 views

How do rate gyros and other sensors send information to the flight control computer in an F-16?

How do rate gyros and other sensors send information to the flight control computer in an F-16? I mean is it a hardwired communication or it is done through a bus? If by bus, what is the bus called? ...
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1answer
138 views

How many turns of a 737 trim wheel equal 2.5 degrees stabilizer deflection?

After the well known crashes I looked at the question of stabilizer trimming. In case of trim runaway the pilot is supposed to "grasp and hold" the wheel manually steering the stabilizer. Hence my ...
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2answers
2k views

Would a 737 pilot use flaps in nose dive?

Since flaps help lift the plane, would they deploy flaps if the plane was nosediving? And what would they do if the back pressure was too much? I know speed increases lift, but can full throttle make ...
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2answers
174 views

On Airbus aircraft, can the pilot control the aircraft when the autopilot is active?

I am looking at the schematics of computerized control for Aibus aircraft and I do not understand the relation between the various control law and the autopilot. Under "normal law" can the pilot ...
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1answer
161 views

What kind of flight-control redundancy does the Tu-204 have?

The Russian Tupolev Tu-204 and variants are reported to be digital fly-by-wire. Are they quadruplex redundant? Do they have manual or analog back-up systems?
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1answer
84 views

How much force is produced by control surfaces?

Context: For some context, I'm a game developer and I'm building a flight sim game. My goal is to have realistic -- not arcade -- physics. The game is in Unity. Unity handles the actual application ...
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1answer
331 views

How does the F-16 side stick convert pilot input to an electrical signal?

In What is the motivation behind designing a control stick that does not move? the F-16's control stick is discussed. What is the method that is used to sense the pilot's input to the stick and ...
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6answers
3k views

What is the maximal acceptable delay between pilot's input and flight control surface actuation?

While I was watching a cockpit video of an A330 landing in which the pilot was frenetically moving its sidestick, I wander what was the reaction time of this flight by wire system. Indeed, the time ...
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3answers
5k views

What is the motivation behind designing a control stick that does not move?

According to Wikipedia (and various other online sources), the control stick on the F-16 does not move. The input values are determined by the amount of force acting on the stick, rather than the ...
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2answers
1k views

What does it mean to move a single flight control to its full deflection?

It is the speed below which you can move a single flight control one time, to its full deflection, for one axis of airplane rotation only This is part of the explanation of maneuvering speed. What ...
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2answers
597 views

Are thrust levers synchronized by default when pushed/pulled? [duplicate]

When I watched this video about the last flight of Juergen "J.R." Raps from SFO to FRA in an A380 (before his retirement) I noticed he lines up or synchronizes the four thrust levers as shown between ...
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1answer
228 views

What is the difference between autopilot and autoflight?

Can you please give me some explanations about autopilot and autoflight system?
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76 views

How did the Caproni Ca.60 electrical communication system work?

On the wikipedia page for the Ca.60 it says: The two nacelles also housed a cockpit for one flight engineer each, who controlled the power output of the engines in response to the orders given by ...
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1answer
255 views

What are the maximum possible stabilizer and elevator deflections for the A320?

For research purposes I would like to know the maximum deflection angles (in both positive and negative direction) of the A320-200's stabilizer and elevator. I am trying to analyse what flight ...
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1answer
127 views

Do Airbus avionics give good deadstick landing outcomes? [closed]

We have recently had a second good outcome, in Russia, of a no power landing of an Airbus aircraft. The first was the "miracle on the Hudson". It appears to me that the avionics of this aircraft are ...
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2answers
153 views

What sort of sensors are used for sensing the positions of the control surfaces for the ECAM F/CTL page on Airbus aircraft?

During the pre-flight flight-controls-check how does the ECAM F/CTL page report on the actual positions of the control surfaces? What sort of sensors are these? Is it a proximity sensor? This is ...