Questions tagged [thrust-reverser]

A system that redirects the air exiting a jet engine forwards or outwards, helping to slow the plane down (usually during landing).

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1answer
101 views

Do the thrust reversers have only two modes : idle and full?

Are there any intermediate thrust reverser settings also? How often do pilots use these intermediate settings?
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Would reverse thrust increase with a decrease in aircraft forward speed when referring to propeller reverse thrust?

Would reverse thrust in a propeller increase with a decrease in aircraft forward speed?
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Are the A380 engines interchangeable (given they are not all equipped with reverse)?

I have noticed that the A380 only uses the two engines closest to the fuselage to reverse thrust to brake. Are all four engines the same (i.e.: could they theoretically swap engine 1 and engine 2) or ...
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Why did the Mercure use cascade-type reversers?

There are three main types of jet-engine thrust reversers:1 Target-type reversers are seen on most civilian turbojets and low-bypass turbofans;2 they have the instantly-recognisable buckets that ...
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How and why does the ATR-72 sometimes use reverse thrust to push back from its parking position?

Travelling with Czech Airlines via Prague in an ATR-72 I have already experienced multiple times that instead of pushback service the planes simply used their reverse thrust to leave their parking ...
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1answer
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Are there any safety features to prevent reversible-pitch props from reversing in flight?

Some aircraft have propellers capable of reversing pitch, which is also known as beta angle. The example I saw was an Aviat Husky. (Youtube demonstration) I want to know if there are any safety ...
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124 views

Why does the use of reverse thrust in flight on the DC-8 cause areas of separated/reversed airflow over the wing?

The DC-8 is one of only a few jetliners that can safely use reverse thrust in flight; even so, reversing the inboard engines (the outboard engines can only be reversed on the ground) while flying ...
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Why is the A380’s with-reversers stopping distance the same as its no-reversers stopping distance?

Thrust reversers, found on almost all jetliners1 and on the larger propliners, redirect engine thrust forwards, helping to slow the aircraft in the event of a landing or rejected takeoff.2 This takes ...
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4answers
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Why are thrust reversers not used to slow down to taxi speeds?

In reading this question (Would more throttle when using reverse thrust reduce stopping distance?), it prompted me to remember that on many of my flights (typically on 737s or CRJ type aircraft), it ...
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1answer
168 views

Why was the VC10 unusually prone to reverser-induced buffeting?

According to Wikipedia, the original (“Standard”) version of the Vickers VC10 had thrust reversers only on the outboard engines, as putting reversers on the inboard engines produced severe tailplane ...
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Why doesn't the Tu-154's center engine have a thrust reverser?

In this gorgeous photo of a landing Tu-154, one can clearly see that the lateral engines are equipped with thrust reversers, but the center engine is not. Why?
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Why do the 737-100/200’s thrust reversers blow fully open if hydraulic pressure is removed while the reversers are partly open?

If the thrust reversers on an Original-series 737 (the 737-100 and -200) are 2 inches or more from the stowed position, and hydraulic pressure is removed from the reverser actuators, the reversers ...
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1answer
169 views

Why are landing-distance and rejected-takeoff certification tests performed without thrust reversers?

All aircraft have to undergo testing to determine how much runway they need in order to land and come to a stop without running out of runway, and how much runway they need in order to be able to ...
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What makes it safe for the DC-8 to use reverse thrust in flight?

For most jets, the use of reverse thrust to slow down in flight, where even possible, is extremely dangerous, and strictly prohibited. Not so on the DC-8, which is certified for the safe in-flight ...
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How do thrust reversers in high-bypass turbofan engines counteract initial thrust?

I've been searching the internet for awhile and haven't really come across a good answer for this question. So: I have a basic understanding of the principles of flight (thrust, lift, drag, etc). But ...
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Could the reversers of a PW4000 on a 777 be deployed in-flight? [duplicate]

Could the thrust reversers accidentally be deployed during a flight? Here, I’m referring to the PW4000 series on a B777, where the engine is similar to the type involved in the crash of Lauda Air ...
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Can the thrust reversers still be activated if the landing gear won't extend?

In the case of Boeings, I understand that the thrust reversers cannot be activated unless the landing gear is extended. However, would it still be possible to activate the thrust reversers if the ...
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Will the steep beta descent mode become illegal for new aircraft?

The PC6 is a popular skydiver carrier due to its ability to use steep nose down beta descent to get back to the ground quickly, even beating free falling skydivers. (YouTube) FAA AC25.1155x (I only ...
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Do large Airliners use full thrust when reversers are deployed?

Do large and heavy Airliners, Jumbos and Super Jumbos wide bodies included use full thrust for braking when reversers are deployed? What is the thrust setting?
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1answer
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What forces act on cascade-type thrust reverser blocker doors?

What is the stress or force that loads the cascade-type thrust reverser blocker doors? As we know, blocker doors are closed and block the airflow going through the C duct. The engine is a V2500 with ...
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2answers
487 views

Why is V1 based only on using brakes?

V1 is the speed that an aircraft may abort a takeoff so long as the airspeed is below it, or is committed to flight if it is over that speed. V1 calculations are based only on the brakes (not sure ...
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808 views

Why is Reverse thrust more effective at higher airspeeds?

It might seem logical at first but why is reverse thrust actually more effective at higher airspeeds? If we assume that engine performance will not change during a 100 knot deceleration on landing ...
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How does the reverse thrust work while landing? [duplicate]

During the landing reverse thrust of an aircraft engine is seen that the compressor fan rotates in opposite direction to counter the aircraft's forward motion if I'm right So, my question here is "...
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Why do pilots cut the reverse thrust below 40 km/h?

In a Microsoft Flight Simulator 2004 Boeing 747 landing tutorial, it was said to cut the reverse thrust after decelerating to 40 km/h. What happens if that was ignored all the way to a complete stop? ...
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1answer
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Does the weather condition of the runway affect the braking of an aircraft with regards to wheel braking and reverse thrust?

I was on a 737 that landed on a snowy runway in northern Finland the other day. We had to wait around 30 minutes to land as they were waiting for it to stop snowing and then for them to clear the ...
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How common is an airliner activating reverse while still in flight? [duplicate]

Around 1977, I watched a DC-9 landing at Guacimeta airport, Lanzarote, Canary Islands, Spain, opening the flaps reversing thrust of both engines just over the airstrip end, but some 9 feet over the ...
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How does a turboprop engine keep running during thrust reversal?

For thrust reversal after landing, a turboprop engine reverses blade pitch and blows air forward. But the engine itself requires air flow for the turbine. How can a turboprop engine keep running when ...
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8answers
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What would be the drawbacks of using a rotating engine as thrust reverser on airliners?

What are the drawbacks for having engines mounted on an aircraft such that their direction can be hydraulically controlled for best performance and efficiency? The idea would be to turn the engine 180 ...
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910 views

How much weight does a thrust reverser add?

How much weight does a thrust reverser add to an engine? Let's take the CFM Leap 1B as an example, which powers the new version of the Boeing 737. This engine can produce up to 130 kN of thrust for ...
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How small can turbojet engines be made whilst remaining fuel efficient, light, cheap, and producing enough thrust to carry a human, gas, and casing? [closed]

I've seen many videos of small turbojet engines (small enough to hold in your hands) that produce 30-40 pounds of force. If you mounted a couple of these on a small craft, that wouldn't even support ...
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Can you push the throttle forward while using reverse thrusters?

Can you push the throttle forward while using reverse thrusters (for turbofans)? Does this have any effect, such as strengthen the "reverse" air blanket? Is it ever used?
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Does the avoidance of thrust reverser save fuel?

On 2017-06-17 i took an AirAsia Airbus A320-200neo from Hong Kong (VHHH) to Kuala Lumpur (WMKK). The flight crew avoided to use reverse thrust for slowing down the plane. Trying to find an ...
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What safety mechanisms prevent thrust reverser deployment in mid-flight?

I just came across the Wiki article on Lauda Air Flight 004, which was destroyed when a thrust reverser activated in mid-air. In the article, it says: The incident led Boeing to modify the thrust ...
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1answer
417 views

How does the EPR reading behave in reverse, and in reheat modes?

Will an engine pressure ratio indicator (EPR) show the same at full mil thrust as with full reversed thrust? What does the EPR indicate at afterburner active? Will it just show the same as for max mil ...
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1answer
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How did the Thrust Reverser Deploy in Lauda Air Flight 004 crash?

How did the electronically controlled thrust reverser in Lauda Air Flight 004 (which crashed) get deployed in mid air without the pilot command. Was there a fault in the electronic controller, a ...
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2answers
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Why is the CFM56 produced with two different thrust reverse options?

According to Wikipedia, the CFM56 could support several reverse thrust options, and it appears that it has actually been built with 2: Boeing seems to prefer the cascade type Airbus seems to prefer ...
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What is the preferred way to slow down an airliner on a long runway?

EDIT: Another way to phrase the question is, given an extra long runway, does it make sense to substitute mechanical braking (which is the primary way to slow down in a typical situation) partially or ...
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Should spoilers and reverse thrust be deployed before nose gear touches down?

On airliners, should spoilers and reverse thrust be deployed before nose gear touches down? I used to thought that deploying them will affect the handling characteristics, so it is best to wait until ...
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341 views

Are there cases of a thrust reverser used on a turbojet engine?

In the case of a turbojet (with no "cold" bypass flow), the airflow being directed forward by an hypothetical thrust reverser can be really hot. Depending on the location of the engine, this flow may ...
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Can reverse-thrust be used to push back from the gate? [duplicate]

Crazy idea, I know. But instead of pushing back a passenger plane using a vehicle connected to the front wheel, what if I turn on the reverse-thrust and rev up the engine? My logic is if it can slow ...
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1answer
511 views

What would happen if thrust reversal is accidentally deployed during a flight? [duplicate]

Is it possible to deploy the thrust reversal, in the cruise phase of a flight? And, if they are accidentally deployed, what could be the possible consequences? As the cruise phase requires a lot of ...
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3answers
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Why do commercial pilots always engage reverse thrust even if it is not necessary?

Most of the time the usage of reverse thrust is not needed. I wonder if it's an authority (e.g. FAA) requirement to land safely. Obviously, in bad weather conditions or when the runway is ...
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Why do modern jetliners provide Thrust Reversers at all in their design decisions?

Let's start with the following knowns (please correct me if I am wrong about any): The braking force provided by the wheel brakes is much larger than that by the thrust reversers One is not allowed ...
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Which Thrust-Reverser-Systems are used by which engines and aircraft? [closed]

Thrust-Reverser-Systems According to various sources, Thrust-Reverser-Systems can be classified as follows ( see e.g. Bräunling's "Flugzeugtriebwerke", Rick's "Gasturbinen und Flugantriebe", Purdue ...
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1answer
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On the V2533 engine, what protections do the FADECs provide against uncommanded unstow?

An uncommanded reverser unstow at high power is quite a problematic event for a flightcrew to handle, at minimum. As a result, engine and airframe builders put protection mechanisms in to prevent ...
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If engine rotation was in reverse would it result in some kind of thrust reverser? [duplicate]

I mean if you rotated the propeller the other way would it result in reverse thrust.I wonder this because the propeller has to rotate in a certain direction to produce thrust, but would putting it in ...
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Is it possible to reject a landing after the thrust reversers have been deployed? [duplicate]

Since thrust reversers take time to deploy and stow are you committed to the landing once you engage them?
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1answer
846 views

Can thrust reversers be set to automatically activate on touchdown?

Is there a switch on the instrument panel that will set the thrust reversers to activate on touchdown like the autobrake? Or is using the thrust levers the only way to activate them?
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Why did the crashed TAM Airlines Flight 3054 veer off the runway only near the end?

For the accident, why did the aircraft veer off the runway near the end of the runway, instead of the moment it touched down (where the left engine went into reverse thrust and the right engine ...
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4answers
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Do the engines still spool up when reverse thrust is selected, but the reversers are not deployed?

The recent question When a large commercial jet touches down, is it committed to stopping? referenced the crash of Red Wings Airlines Flight 9268, which overran the end of the runway at nearly full ...