EH101 emergency landing
Local news "Viborg Folkeblad", near Karup Air Base (EKKA), reports that a danish Merlin EH101 Wednesday made an precautionary terrain landing. A military spokesman says that all danish EH101 are grounded, except lifesaving flights.
Sources within the military reports that all three engines stopped within few seconds and subsequent autorotation performed to an open field. Karup-helikoptere sat ud af spillet - Viborg | viborg-folkeblad.dk |
Calling AR after triple engine failure a precautionary landing...?
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Is this a first in helicopter aviation? A triple engine failure.
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Are the British ones grounded too?
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Or a double pilot failure
Or a single fuel failure |
Originally Posted by Sikorsky
(Post 9315183)
Sources within the military reports that all three engines stopped within few seconds and subsequent autorotation performed to an open field.
Karup-helikoptere sat ud af spillet - Viborg | viborg-folkeblad.dk |
That's one of the issues, that military gives one explanation to the press, but fact is probably different...
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but fact is probably different... |
remember this is a RUMOUR network!
so we are probably not getting anything like the full story. No doubt FH are on top of it, the appropriate specialists (none of whom are on this forum) will have the full picture
UK are still flying and I don't believe that any other EH101/AW101 are grounded so this suggests not a fleetwide/design problem At some point all will be made clear I am sure anyway congrats to the pilot for getting safely down DM |
Well.... the excellent Flt Lt Ben Wallis (for it was he, in charge) has finally, 31 months later, been handed his well-deserved Air Force Cross by a fellow helo pilot, the Duke of Cambridge, aka Prince William.
https://www.forces.net/services/raf/...c034-440992797 But, Flt Lt Ben's undoubted courage and expertise aside, what bothers me is how a three-engined helo can suddenly run out of power. To say nothing of the fact that it was at night, and over forest. Anyone care to say what actually went wrong - or, better still, point me towards the Service Inquiry? airsound |
or, better still, point me towards the Service Inquiry? |
Danish Merlins were originally RAF owned, there perhaps is the reason why.
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Totti,
Think it was the other way round. We bought 6 Merlins of the Danes in an attempt to respond to the "lack of helicopters" criticism in Afghanistan. We bought the Danes 6 replacement aircraft. Airsound, The Merlin is an underpowered / undertransmissioned beast - a circa 11000kg empty aircraft with a max TOW of just 15600kg. At high weights and low airspeed it can be poorly placed….. None of which detracts from the fact that the lad done good…. |
Broad spectrum but software problem or fuel to cause a triple ECU failure?
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Evalu8ter - I get that
At high weights and low airspeed it can be poorly placed….. I imagine current Merliners must be familiar with the story behind this, happily uneventful, event. airsound |
I believe it is as caused by freewheel units slipping leading to two engines shutting down through over speed and the third going to an idle power setting due to some FADEC logic. |
Some logic... two enigines shutdown and the FADEC puts the last Engine to Idle! That sounds just a bit odd. |
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. |
How to make a twin turbine helicopter even more complex. Add a third engine. :)
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Originally Posted by 212man
(Post 10301178)
I believe it is as caused by freewheel units slipping leading to two engines shutting down through over speed and the third going to an idle power setting due to some FADEC logic. |
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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