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-   -   EASA.2012.OP.09 Study on single-engined helicopter operations (https://www.pprune.org/rotorheads/538461-easa-2012-op-09-study-single-engined-helicopter-operations.html)

9Aplus 23rd Apr 2014 15:36

EASA.2012.OP.09 Study on single-engined helicopter operations
 
EASA.2012.OP.09 | EASA



The Final Recommendations suggest measures to improve the suitability of single-engined
helicopters for Commercial Air Transport operations according to all previous analysis, especially the
Safety Risk Assessment.

First recommendations are referred to JAR-OPS 3.005(e) approvals. JAR-OPS 3.005(e) and the successor rule, CAT.POL.H.420, allow an exception to the rule for Commercial Air Transport operation of turbine single-engined helicopters to be conducted only along such routes or within such areas for which surfaces
are available which permit a safe forced landing.

The safety level to be maintained in these operations is
expressed as an engine failure rate being better than 1x10-5per flight hour.
The results of this study indicate that, whereas the rate for turbine-engined helicopters is significantly better at 0,36x10-5
per flight hour, the rate for piston-engined at 0,89x10-5
per flight hour is a factor of 2,5 higher and closer to the limit of 1x10-5 per flight hour.
It is therefore recommended to:
 retain the alleviation, but not to expand it to piston-engined helicopters; and
 take the adequate steps to ensure that all states apply the same standards in the same manner, ultimately when Implementing Rule 965/2012 takes effect on 28 October 2014, as a number of EASA member States appear to vary with the JAR-OPS standards.
 The assess of limitation in seat capacity according to the Maximum Operational Passenger Seating Configuration (MOPSC) have concluded the recommendation to retain the limit of 6 passengers.

No more robbie ?! :}

Dave Sharpe 23rd Apr 2014 16:06

No More R22-44
 
There is an interesting article about Turbine reliability Vs Piston in Rotor and Wing March 2003--Perhaps its not unbiased as its written by Tim Tucker---statistics can be made to read whatever way the writer wants them to but its worth a read ----

AnFI 24th Apr 2014 00:40

Anyone who has read the report upon which these figures are based will see that this represents fraudulent misuse of statistics. Even the swapping of turbine and piston figures half way through!

The figures used for hours in the denominator are sensitive and are dubious also.

Categorisation of the cause is also 'dirty work' performend by an individual.

Not to mention using totally non representative samples of piston types and disregarding those types that do use significant de-rating to acheive the most impressive reliability.

Moreover right there in that proposal even the fraudulently derived statistics are qualifying at better than the criteria stated. Thus making the point that even with dubious derivation there is not the stated basis upon which to draw the conclusion.

It is a nonsense.

This is nothing but an extension of a trade war being fought by obstructive legislation. This will not do anyone anygood. This smacks of French non-free trade tactics - the backlash will hurt everybody. The French sell a lot of their product in the US and this is shortsighted 'cleaverness'.

If we carry on using irrelevant and erroneous stats we are kidding ourselves.

This is nonsense and must not be allowed to succeed.

Govt agencies have an obligation to be 'fair' and not allow these shabby vested interests to prevail.

We have witnessed a disgrace already with the R66 certification and now this. The US govt maybe be forced to retaliate and this will be lousy for everyone.

They used to burn whiches on the basis that they didn't drown, haven't we moved on?

Every fair minded person should be repulsed by this.

(previous bogus statistics used for legislation have already been discredited here: 10^-10 not true! Maybe we could use some science rather than tea leaves?)

Freewheel 24th Apr 2014 08:07

It may be worth remembering that there is a French manufacturer that will be heavily stung by this as well.

Bravo73 24th Apr 2014 10:29


Originally Posted by AnFI (Post 8447859)
Anyone who has read the report upon which these figures are based will see that this represents fraudulent misuse of statistics. Even the swapping of turbine and piston figures half way through!

The figures used for hours in the denominator are sensitive and are dubious also.

Categorisation of the cause is also 'dirty work' performend by an individual.

Not to mention using totally non representative samples of piston types and disregarding those types that do use significant de-rating to acheive the most impressive reliability.

Moreover right there in that proposal even the fraudulently derived statistics are qualifying at better than the criteria stated. Thus making the point that even with dubious derivation there is not the stated basis upon which to draw the conclusion.

It is a nonsense.

This is nothing but an extension of a trade war being fought by obstructive legislation. This will not do anyone anygood. This smacks of French non-free trade tactics - the backlash will hurt everybody. The French sell a lot of their product in the US and this is shortsighted 'cleaverness'.

If we carry on using irrelevant and erroneous stats we are kidding ourselves.

This is nonsense and must not be allowed to succeed.

Govt agencies have an obligation to be 'fair' and not allow these shabby vested interests to prevail.

We have witnessed a disgrace already with the R66 certification and now this. The US govt maybe be forced to retaliate and this will be lousy for everyone.

They used to burn whiches on the basis that they didn't drown, haven't we moved on?

Every fair minded person should be repulsed by this.

(previous bogus statistics used for legislation have already been discredited here: 10^-10 not true! Maybe we could use some science rather than tea leaves?)

Bubba, is that you? :suspect:

AnFI 24th Apr 2014 10:52

Forrest !!!

Its you !


Seriously though this kind of dirty politics is disgusting and needs to be stopped - what's it all about? trying to make jobs for diplomats ?

It is BS - period!

Neither Bruno nor Bill Faury can't be stupid enough to think this does them any good - they should call off EASA and stop being a brunch of punts.

Robbo Jock 24th Apr 2014 14:16

Can't comment on the stats used to derive the figures, but presumably someone calculated that a failure rate of 1x10^-5 / hour is pretty darned safe, hence it was used for the study.
They really cannot then say "yup, piston engines fall within our pretty darned safe level, but not by far enough".

Tantamount to "We've placed a stop sign here, but you must stop 50m short of it or we'll ban you from driving".

Also, a nice statement in there: "apply the same standards in the same manner". Might be nice if they applied their own standards.

nigelh 24th Apr 2014 22:20

Are these new rules ?? If so , what do they mean ??!!!

Arrrj 25th Apr 2014 11:29

Lunacy, lies, statistics and politics.

I would much rather fly a really well maintained 44 than a 30 year old jetty that had been overtorqued plenty of times (for example).

I have met Tim Tucker, I found him to be a straight shooter, and really good bloke with an encyclopaedic knowledge of helicopters. He also has a great interest in wine too...which in my book is a good thing ! I doubt he was lying when he gave the talk mentioned earlier.

I want to see the numbers on the following -

How many people have been hurt on the ground anywhere in the world due to engine failure in ANY type of single engine heli ? In Australia, it's none. I suspect that the numbers are similar elsewhere.

Unbelievable.

Watch out everyone, if you don't have a twin (and a good one) you won't be able to fly anywhere soon.

The older chaps reading this, who used to fly everywhere in singles, including around the world (hello Dick Smith etc), would be feeling ill reading this rubbish.

Arrrj

PS _ maybe we need two engines in our cars now too ? A long, long time ago, the car I was driving ceased to operate...:ugh:

nigelh 25th Apr 2014 17:02

I am still completely unaware as to the actual effect of any change in rules . In fact i cannot even FIND the rule change !!! Oh well ...i fly a twin so who cares ...............................

AnFI 16th Nov 2014 12:31

PARIS?
 
I think they just banned singles from Paris? Can it be true?

Anyone know what the situation is?

jimf671 16th Nov 2014 12:55

I find this to be a very strange state of affairs when we are being flown across the Atlantic on aircraft with two engines when not many years ago airliners had four engines because there wasn't space for five.

Helilog56 16th Nov 2014 13:03

Yeah Jim....not a lot of single engine trans-Atlantic jets though.....;)

mickjoebill 19th Nov 2014 19:12


How many people have been hurt on the ground anywhere in the world due to engine failure in ANY type of single engine heli ? In Australia, it's none. I suspect that the numbers are similar elsewhere.
My research indicates that from 2000 to 2013 there were no reported injuries to the public in filming or photography related prangs. Worldwide, 150 incidents, twins and singles.

But sadley a member of the public was killed this year when a news chopper toppled from a rooftop pad.


Mickjoebill

SuperF 20th Nov 2014 04:24

Pretty sure someone has been killed in London from a twin falling out of the sky onto them. Maybe we should ban twins and only fly singles??

Arrrj 20th Nov 2014 07:00

SuperF,

:ok:

Arrrj

(PS - no popcorn here...).

Aussierob 20th Nov 2014 15:13

One in BC, Canada from 2008.


4 killed in helicopter crash in southeastern B.C. - British Columbia - CBC News

AnFI 26th Nov 2014 20:05

wow that's rare, but it doesn't say engine failed ("pilot might have closed the throttle", and they didn't give themselves much time from 120ft over a built up area. Also the old chestnut of putting the lever down to preserve RRPM crops up. (though also ideep in HVcurve too). Every possible thing will happen to some extent. there was (apparently) once a case of an engine failing on a twin whilst it was climbing upwards and backwards, doesn't make it a good idea tho

In UK we have far more twins embedded in roofs than singles.

If at all this twin (engine redundancy) concept should be limitted to aircraft above a mass threshold, if at all. It is just not justified nor justifiable for light helicopters.

Is it true about Paris? Anyone know?

Left_Pedal 27th Nov 2014 00:09

Better get rid of all those piston airplanes as well, especially the singles then....:rolleyes:

mdovey 27th Nov 2014 04:46

If I believe wikipedia, there were 2175 road traffic deaths in the UK alone in 2012, and 1.2M worldwide in 2010.

Most if not all of those deaths would have involved a single piston engine vehicle, and a significant majority would have happened in densely populated areas.

Based on those statistics, I'd say we definitely need a ban on single piston engines vehicles in populated areas.

Matthew


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