"Hard Landing" in Venezuela
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"Hard Landing" in Venezuela
Or so the headline says. Yup; I'd say when the engines are left swinging in the breeze and the fuselage is buckled, you could call it a hard landing... 
Accident: Aeropostal DC95 at Puerto Ordaz on Sep 26th 2011, hard landing tears engines off
Accident: Aeropostal DC95 at Puerto Ordaz on Sep 26th 2011, hard landing tears engines off
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Would that be shear pins breaking to cause the pylons to come adrift.
Are they lifed like the B747?
Are they lifed like the B747?
I know that the engines are mounted with fuse pins, I just wonder how many "G's" it takes to make them shear?
Second question was the G loading enough to partially colapse the seats.
I am sitting here with a sore back just looking at the G loads.
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Second question was the G loading enough to partially colapse the seats.
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Is that the reversers open on the right hand engine?
Force hard enough to open them? One opened prematurely?
Would turn the plane the flight characteristics into a crowbar if it did.
Force hard enough to open them? One opened prematurely?
Would turn the plane the flight characteristics into a crowbar if it did.
Agree that the buckled fuselage is a pointer to the over-G hard landing.
The DC9 shear pins are quite a bit different than the mounting pins in the B737 and B727 (diiferent load paths etc.).
There have been cases where after-market work installing hush-kits etc, has mistakenly swapped Boeing fuse pins into Douglas aircraft. Aint nobody broke one that I know of.
The DC9 shear pins are quite a bit different than the mounting pins in the B737 and B727 (diiferent load paths etc.).
There have been cases where after-market work installing hush-kits etc, has mistakenly swapped Boeing fuse pins into Douglas aircraft. Aint nobody broke one that I know of.
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Force hard enough to open them? One opened prematurely?
Would turn the plane the flight characteristics into a crowbar if it did.
Would turn the plane the flight characteristics into a crowbar if it did.
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As in don't have the capability for thrust reversers? Or the capability for it to deploy in flight?
Because the -50 model certainly has thrust reversers. As for the capability for it to deploy in flight... well if its mechanical, it can fail.
The reason why I think it has deployed in flight is that after the landing and the engines have seperated to the extent that it has, one would think that the engines controls would no longer work.
Just my take on things. More than happy to be proved wrong and learn something new!
Because the -50 model certainly has thrust reversers. As for the capability for it to deploy in flight... well if its mechanical, it can fail.
The reason why I think it has deployed in flight is that after the landing and the engines have seperated to the extent that it has, one would think that the engines controls would no longer work.
Just my take on things. More than happy to be proved wrong and learn something new!
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Speculation, but once the anchor points for a mechanical system start to move relative to each other, unusual behaviour is possible.
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@lilflyboy262
I meant capability to deploy the TR's in flight. Since it is a mechanical function, it surely can fail, however, I can't think of a reason why only one TR would deploy when the engine is coming from a rather constant mode of operation (approach and landing) and if it did deployed in flight, I think we would be looking for either more serious damage (emphasized on the side with the reverser opened) or no damage at all if the height the reverser deployed at was low enough (which we cannot tell at all with the information we have now).
My 2c is that it is a consequence of the hard landing, since if I recall correctly, the reverser clamshells on the -9 series are mechanically held close by a or a series of pins. If those pins sheared because of the force of the landing I think that sort of damage could happen.
I stand to be corrected though...
I meant capability to deploy the TR's in flight. Since it is a mechanical function, it surely can fail, however, I can't think of a reason why only one TR would deploy when the engine is coming from a rather constant mode of operation (approach and landing) and if it did deployed in flight, I think we would be looking for either more serious damage (emphasized on the side with the reverser opened) or no damage at all if the height the reverser deployed at was low enough (which we cannot tell at all with the information we have now).
My 2c is that it is a consequence of the hard landing, since if I recall correctly, the reverser clamshells on the -9 series are mechanically held close by a or a series of pins. If those pins sheared because of the force of the landing I think that sort of damage could happen.
I stand to be corrected though...
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I know that the engines are mounted with fuse pins, I just wonder how many "G's" it takes to make them shear?
Second question was the G loading enough to partially colapse the seats.
I am sitting here with a sore back just looking at the G loads.
Second question was the G loading enough to partially colapse the seats.
I am sitting here with a sore back just looking at the G loads.
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Would that be shear pins breaking to cause the pylons to come adrift
Originally Posted by Escape Path
...Probably a side effect from the hard landing...