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Questions tagged [thrust-reverser]

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

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5answers
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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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1answer
146 views

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 ...
2
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1answer
163 views

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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3answers
298 views

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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2answers
229 views

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
161 views

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 ...
2
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2answers
356 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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2answers
448 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 ...
8
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1answer
735 views

How an Engine thrust changes with airspeed? Why?

I'm interested in how the thrust of a turbofan engine is affected at higher airspeeds (TAS). I know (I believed) that engine thrust(at constant N1) was relatively constant like in the following graph (...
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2answers
2k views

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 "...
3
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2answers
981 views

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
99 views

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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1answer
168 views

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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1answer
663 views

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
4k views

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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3answers
668 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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1answer
597 views

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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3answers
561 views

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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3answers
946 views

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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2answers
1k views

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 ...
3
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1answer
237 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 ...
6
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1answer
3k views

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
951 views

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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3answers
1k views

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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2answers
2k views

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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1answer
241 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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2answers
3k views

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 ...
3
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1answer
361 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
1k views

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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2answers
1k views

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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0answers
4k views

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
261 views

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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3answers
4k views

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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0answers
85 views

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
683 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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1answer
528 views

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
1k views

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 ...
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4answers
4k views

Why don't most fighters have thrust reversers?

With the exception of the Panavia Tornado, fighters do not have thrust reversers. Why is this? Why does the Panavia Tornado have them?
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1answer
2k views

How much thrust can the thrust reversers create?

Let's say for the sake of the question, the plane is an 787 Dreamliner and the engine is the General Electric GEnx-1B64 (that according to Wikipedia can produce a maximum thrust of 284 kN) In ...
5
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3answers
687 views

Can thrust reversers alone steer and stop an airliner?

Is it possible to use ONLY thrust reversers to steer and bring a smaller size commercial jet aircraft, with a minimum amount of fuel onboard, to a complete stop, after touching down on a longer than ...
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6answers
3k views

Is a powerback allowed by airlines as a safe maneuver?

I watched some videos on YouTube where the pilot used the thrust-reverser for push-back instead of the push-back tug. Some examples: MD80 Powerback DC9 Ground Reverser Powerback Is this procedure ...
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2answers
2k views

Why are thrust reversers so unreliable?

I see many questions regarding the unreliability of thrust reversers. Why are these components so faulty across all airplane models and manufacturers? Is there a technical challenge to making the the ...
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1answer
625 views

A380 reverse thrust on only half the engines [duplicate]

I noticed on this video of an A380 landing in rain that reverse thrust was applied to only the inboard engines. Do the outboard engines not have reverse thrusters? If they don't, then why not? If they ...
44
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4answers
8k views

If airplanes can't use reverse thrust in flight, what am I hearing?

I've flown on a few commercial flights, and on several of them I recall a phase of the flight during descent when the engine seemed to go idle (or at least, the engine noise subsided substantially) ...
4
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1answer
853 views

Is it negligent to depart with one thrust reverser inoperative?

[Source:] The aircraft had departed with one thrust reverser (on the left wing) inoperative, and the pilots knew of incidents in the craft's maintenance log where the auto-brakes had failed to ...
4
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1answer
218 views

On average, how many overhauls will thrust reversers have in their lifetime?

How many overhauls will a wide body aircraft composite thrust reverser undergo in its life? (not including damage, etc.)
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1answer
777 views

How does a typical passenger jet come to a stop when it lands [duplicate]

Do the pilots of the plane simply reverse thrust of the engines after touchdown or are there brakes on the landing wheels that slow the plane just like a car? Or a combination of both? What about ...
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4answers
11k views

Is it possible to use reverse thrust while airborne? [duplicate]

I play a flight-sim called X Plane. The other day while I was approaching an airport a little too fast and knew I couldn't slow down in time. I decided to use the reverse thrust while I was still in ...
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1answer
775 views

A320 procedures for one thrust reverser inoperative; why is the old procedure more efficient?

I recently watched the Mayday series about TAM Airline Flight 3054. Landing on a short runway with only one thrust reverser in use, and the documentary explained something like: The old Airbus ...
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3answers
10k views

Is it possible to use thrust reversers to taxi backwards?

Can commercial airliners theoretically taxi backwards using reverse thrust? If this is possible, why isn't it common? I can already imagine some safety reasons...