Questions tagged [autothrust]

An autothrottle (automatic throttle) allows a pilot to control the power setting of an aircraft's engines by specifying a desired flight characteristic, rather than manually controlling the fuel flow.

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On the Airbus A320 family, when does the autothrust disconnect?

I know you can press the AT disconnect button on the sides of the throttle. You can press the A/THR button on the FCU. When does it disconnect automatically? For example, on landing.
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How does the B737's 'throttle offline' setting work?

I'm concerned about this article: Throttle online means that the crew can override the autothrottle logic, while Throttle offline means that the logic cannot be overridden. So for example - rejected ...
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What are the various thrust modes in the Airbus A320?

I was going through A320 AFM and came across Thrust modes. I was not able to understand why thrust is in thrust mode during climb and descent because we climb or descent with a constant speed. So ...
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Are there any autoland capable aircraft without autothrottles?

While reading the question Why couldn't the CRJ100/200 be equipped with triple-string autoland? I thought the CRJ cannot have autoland because it is not equipped with autothrottles. Somehow I ...
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Can commercial automatic flight control fly back-side?

For most commercial flight director, autopilot and auto-throttle systems (e.g. the A330-300, B737-800), the flight director/autopilot flies the altitude hold (ALT) or vertical speed (V/S) mode by ...
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Why is TO/GA button disabled in 777 with weight on wheels or below 2 ft RA?

Recently a final report for accident of an Emirates B777-300 at Dubai on 3rd August 2016 was published. An important factor there was that when the pilot tried to recover from long landing by going ...
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What indication will appear in case of one of A320 LGCIU is inoperative?

What indication and where it will appear in case of one of LGCIU (landing gear control and interface unit) is inoperative?
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Does the auto thrust at takeoff compensate for asymmetric engine characteristics?

When a percentage thrust has been determined for take off the auto thrust system (Airbus) or the auto throttle (Boeing) will send the data to the engines FADECs to provide the required thrust. When ...
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Do modern aircraft automatically manage the deceleration to Vref?

Typically in most aircraft, the pilot manually reduces the speed gradually until reaching the landing zone/flare zone. Modern aircraft have FMC. Does the FMC automatically manage the speed gradually ...
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How to apply the TO/GA time and EGT limits?

If there is a published 1) EGT limit and a 2) TO/GA time limit, which one should be applied when the EGT is well below the EGT limit and possibly even below the 'max continuous' EGT. Particularly with ...
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Airbus A320 automatic speed mode protection in SRS vertical mode

According to the A320 FCOM, capter 22 auto flight, flight guidance, the "automatic speed mode protection" of the auto flight system of the A320 disengages the flight directors upon reaching current ...
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Can autothrottle be used without autopilot (and vice versa)?

In commercial passenger aircraft: Can autothrust be used with A/P disabled ? And can A/P be used without using autothrust? Citable references very welcome! If the question depends on a specific ...
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Can thrust be selected manually in a plane with autothrust? If yes, how?

I'm getting into the autothrust world and I have the question of whether it would be possible to disengage it and select the thrust manually in a plane that already has autothrust. How could it be ...
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What is TOGA LK in Airbus 320? How to come out of TOGA LK?

What is TOGA LK in Airbus 320? How to come out of TOGA LK? I see it comes in Windshear Escape Manoeuvre. How is it related to Alpha Floor.
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What is a "flare-out" and why does auto-thrust reduce thrust during flare-out?

The functions of auto-thrust include thrust reduction during a flare-out. What is flare out and why during flare out will the auto-thrust reduce thrust?
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Is there a specific formula or way to calculate flex temperature for an Airbus A320?

I have hear of RTOW charts but I haven't seen any calculations with the runway length or slope. What is the formula or equation to finding flex temperature and V-Speeds?
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Would an A320 override the autothrottle due to an erroneous radio-altimeter?

The pilots of Turkish Airlines Flight 1951 had multiple issues with the auto-throttle setting itself to idle during approach: despite manually adding throttle, the plane stalled and crashed before ...
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What determines the "acceleration" and "thrust reduction" heights?

Thrust reduction height is the height at which automatic thrust reduction from takeoff thrust to climb thrust happens. And acceleration height is the height at which you start accelerating the plane ...
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What is Auto-thrust?

I have heard about auto-thrust yet I still don't know what it is. Can someone please explain to me what it is? I know that I can just Google this up, but I was hoping that a community which revolves ...
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Can autothrust keep the plane aligned with the runway during crabbing?

I'm not talking about the entire auto pilot system, but only the thrust. Because I think, when experiencing crosswind during landing, the speed of wind may fluctuate and on 3 digit approach altitudes ...
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What mode is the Boeing 777's autothrottle in right after touch down?

This question came to my mind when I saw the Emirates B773 (Dubai on Aug 3rd 2016) accident. I saw a couple of 777 cockpit videos and I saw that autothrottle (A/T) is widely used during landing and ...
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How do pilots set the exact amount of thrust needed for a reduced power takeoff?

I know jet-powered airplanes very rarely use 100% available power for takeoff, and most often reduce power to increase engine life. How does a pilot set thrust to an exact level? The airplanes I'm ...
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Why do most propeller-powered planes not have an autothrottle?

Why does every kind of propeller-powered plane lack an auto-throttle? No single-props no twin-props, not even turboprops like the Dash-8 Q400. To be honest, I don't know many turboprops, but if the ...
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Which computer controls auto thrust on an Airbus A320?

An Airbus A320 has seven computers that control flight surfaces: two ELAC, three SEC, two FAC, and two AP (autopilot) computers. Is there an separate computer that controls auto thrust, or is this ...
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