It shouldn't be inferred that one FADEC behaved in that way due to the other engines. |
Originally Posted by SASless
(Post 10301593)
Some logic... two enigines shutdown and the FADEC puts the last Engine to Idle! That sounds just a bit odd. My suggestion is that the FADECs responded to what they were seeing at their own engines, and would do so in isolation not as a joint "logic" with the other engines. |
So....any idea why in a three engine aircraft....two independent FWU's and an independent FADEC all decide to go Tits Up at the same time?
Inquiring minds wish to know! |
There are 3 engines, "3" FADECs and 3 freewheel units. They are of course linked mechanically. I can see why a FADEC would shut down an engine, or back it to IDLE, as a consequence of a freewheel failure. That is the point I was trying to make, the behaviour of the engines could be consistent with what they were seeing mechanically.
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I agree on the two engines that had the Free Wheel failures....seems odd that two would fail at the same time.
The third FADEC should have gone to max power it would seem as its engine was the sole source of power as the other two had gone to idle due to the Free Wheel Units failing. Why would the last good engine's FADEC go to idle is my question.....along with wondering about the odds of three such "failures" that put the aircraft on the ground with no useable engine power despite having three engines. |
I've assumed that the third engine was at idle deliberately and therefore was also part of the failure events. Rather than it being at idle as a result of the other two engines being shutdown. To me personally that hints at there being a problem with it too.
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Or....as it was a training sortie....had the Instructor pulled the one engine back to idle to simulate an engine failure....then the other two engine FWU decide to start slipping and thus begat a real emergency?
The full account is going to make for interesting reading when it is available for consideration. |
Can a merlin driver please confirm the rumour that a EH101 cannot fly on 1 engine
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The full account is going to make for interesting reading when it is available for consideration. But I definitely hope that, whatever the problem was, someone knows about it who could do something to make sure it doesn't happen again - and has done just that! airsound |
If ever there was a reason for designing a four-engined helicopter...
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Originally Posted by pants on fire...
(Post 10303300)
If ever there was a reason for designing a four-engined helicopter...
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Originally Posted by pants on fire...
(Post 10303300)
If ever there was a reason for designing a four-engined helicopter...
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AnFi is probably in a Rest Home having had a nervous breakdown upon reading the post that even mentioned a four engine helicopter.:eek:
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Any count over one probably gives him seizures!:eek:
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Originally Posted by Thomas coupling
(Post 10302551)
Can a merlin driver please confirm the rumour that a EH101 cannot fly on 1 engine
The down-ness depends on PA, OAT, PPI, AUM, IAS and engine rating applied. |
Originally Posted by Blade Slap
(Post 10306301)
It can fly, just with a ROD.
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A Merlin can definitely fly in a 40ft hover with one ECU shut down (because of FOD), one at fly and one increasingly destroying itself due to ice ingestion.
Makes a sound a bit like a Gazelle though..... |
Originally Posted by Cows getting bigger
(Post 10301942)
How to make a twin turbine helicopter even more complex. Add a third engine. :)
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Amazing white elephant then, as it is now - A £40 million three engined aircraft that only has duplex redundancy.
Which bright spark signed this off? An aircraft that can't go front line for fear of being shot at because of the cost of trying to repair carbon fibre holes in the field. |
Originally Posted by Thomas coupling
(Post 10309475)
... three engined aircraft that only has duplex redundancy.
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