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Search: Posts Made By: turboshafts
Showing results 1 to 35 of 40
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Forum: Rotorheads
12th Oct 2016, 22:22
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

then we also come back to that of interpreting...

then we also come back to that of interpreting the facts...

I still don´t agree to the fact that LN-OJF had "no" spalling Before the breakdown.

the pics shown are as well spalling evident and...
Forum: Rotorheads
19th Aug 2016, 13:22
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I am clearly not an expert in the field of...

I am clearly not an expert in the field of helicopter gearboxes,
but the same problems is apparent in all automatic gearboxes.
They do not have the same amount of planetary gears,
but they do have...
Forum: Rotorheads
18th Aug 2016, 13:01
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Btw, in the Nasa report and Bell report that...

Btw,

in the Nasa report and Bell report that I linked to (earlier in this thread)
there was even a test showing the rigidity of the conical housing with respect to
the gear failure.

The next...
Forum: Rotorheads
18th Aug 2016, 12:48
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

in any case as long as there is a rigid fit...

in any case as long as there is a rigid fit between rotor
mast and 2nd stage planet carrier it will take up radial load.
the bearing in the bottom of the conical housing will take up some load.
...
Forum: Rotorheads
17th Aug 2016, 10:04
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Radial load from the rotor mast is transferred...

Radial load from the rotor mast is transferred through the upper planet carrier
and onto the planetary gear. So to even transfer the load on to the gears there is a flex in the system.
I am sure...
Forum: Rotorheads
16th Aug 2016, 13:15
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Is there any other reason the upper stage is...

Is there any other reason the upper stage is significantly
wider than the lower

There must as well be a reason related to fatigue
that they don´t stiffen the conical housing any more.

but...
Forum: Rotorheads
8th Jul 2016, 14:04
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

emergency or run dry capability does not help if...

emergency or run dry capability does not help if the rotor falls off.

the problem here as I see it is to find a system that
in case of severe MGB failure, does not shear the rotor of the AC.
...
Forum: Rotorheads
6th Jul 2016, 19:48
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I am trying to understand how the rotor mast are...

I am trying to understand how the rotor mast are supported in the sun gear
and how the bearing loads would be if the rotor came out of control as a result of a crack in the conical housing leading...
Forum: Rotorheads
4th Jul 2016, 11:11
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Klare likheter mellom to fatale Super...

Klare likheter mellom to fatale Super Puma-ulykker - Tu.no (http://www.tu.no/artikler/klare-likheter-mellom-to-fatale-super-puma-ulykker/349103)

Here they claim that the cracks have propagated...
Forum: Rotorheads
1st Jul 2016, 15:16
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

From the report: Components rejected, in...

From the report:
Components rejected, in operation or during overhaul, were inspected in accordance with the Continued Airworthiness programme. Those which were considered to show new or unusual...
Forum: Rotorheads
30th Jun 2016, 23:17
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

This is what Nadar wrote. I asked a question,...

This is what Nadar wrote. I asked a question, wether it is clearly known if there are no HUMS readouts, or no abnormal readouts.



That´s is why there is an immense amount of durability testing...
Forum: Rotorheads
29th Jun 2016, 17:57
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Thanks for your detailed answer and citations! ...

Thanks for your detailed answer and citations!

If there where no HUMS readouts, how can they conclude it is not a sufficient way of monitoring?

In G-REDL there was indeed seen several HUMS...
Forum: Rotorheads
28th Jun 2016, 23:17
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I don´t understand this statement: "Also,...

I don´t understand this statement:

"Also, the HUMS appears unable to identify symptoms of such degradation in the epicyclic module"

From the G-REDL report, it is quite clear that there was...
Forum: Rotorheads
23rd Jun 2016, 12:12
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I think you are right to me it's both a...

I think you are right

to me it's both a technical and a cultural problem,
combined with a control authority regime that is reactive.

In other countries outside Europe, there is much more focus...
Forum: Rotorheads
21st Jun 2016, 01:06
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Arnie you are right and I take your Point. ...

Arnie you are right and I take your Point.

However, there are several types of heat treatment that can be done to
a steel.

When you say hardened and brittle. There are several types of...
Forum: Rotorheads
17th Jun 2016, 22:21
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Radial roller bearings outer races are heated up...

Radial roller bearings outer races are heated up and pressed oval in a die when mounting the balls.
They would not crack with a hammer hit. The standard bearing material is 100Cr6 and has a surface...
Forum: Rotorheads
12th Jun 2016, 18:40
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

No, I referred only with CHC and AH info, ...

No,

I referred only with CHC and AH info,
mostly as an answer to n305fa.

The arguments against that info is fully equitable.

Thanks
Forum: Rotorheads
12th Jun 2016, 09:19
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Here are all TBO from the EC225 spec sheet ...

Here are all TBO from the EC225 spec sheet

http://airbushelicoptersinc.com/images/products/ec225/ec225-tech_data_2009.pdf


Let's go through some dates again (from oep.no)

...
Forum: Rotorheads
11th Jun 2016, 22:12
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Luftfartstilsynet: Ulykkeshelikopteret skiftet...

Luftfartstilsynet: Ulykkeshelikopteret skiftet girkasse og rotor i år - Helikopterstyrten i Hordaland - VG...
Forum: Rotorheads
11th Jun 2016, 17:27
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Here is my summary on TBO. The MGB had a...

Here is my summary on TBO.

The MGB had a total flight time of 2300 hours before OH according to the PR agency Zync reports to media. (Incl 4 extensions of TBO, recorded in OEP)
Zync has also...
Forum: Rotorheads
10th Jun 2016, 15:15
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Simmer down lad, I am not claiming anyone...

Simmer down lad,

I am not claiming anyone lying.

a contradiction simply meaning there are two different explanations.
I did not say that I conclude to either one of those.

I am trying to...
Forum: Rotorheads
10th Jun 2016, 11:22
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

To get the whole context you should eventually...

To get the whole context you should eventually look back a few pages.
but here are some points I made earlier

Claiming that helicopter had not have problems
(media reports that there where...
Forum: Rotorheads
10th Jun 2016, 08:45
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Very interesting. It is nothing directly new,...

Very interesting.
It is nothing directly new, except they refer to the meeting protocol of
ekstraordinært møte i Samarbeidsforum for helikoptersikkerhet på norsk kontinentalsokkel (SF). That has...
Forum: Rotorheads
10th Jun 2016, 08:32
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I fully agree with HeliComparator! Seeing in...

I fully agree with HeliComparator!

Seeing in the light of how the bereaved from former accidents
are feeling towards the openness of the investigation, it is high time
that there is put some...
Forum: Rotorheads
8th Jun 2016, 11:25
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

what we do know is this: TURØY - Helikopteret...

what we do know is this:
TURØY - Helikopteret avbrøt flygning tre dager før ulykken (http://www.nettavisen.no/nyheter/helikopteret-avbrt-flygning-tre-dager-fr-ulykken/3423219437.html)

There where...
Forum: Rotorheads
7th Jun 2016, 17:38
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

CHC-sjefen: - Vi har ikke tilgang til girkassen -...

CHC-sjefen: - Vi har ikke tilgang til girkassen - Bergens Tidende (http://www.bt.no/nyheter/lokalt/CHC-sjefen---Vi-har-ikke-tilgang-til-girkassen-3607349.html?xtor=RSS-2)

Ny girkasse i januar

-...
Forum: Rotorheads
7th Jun 2016, 09:30
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

If that is the case, it´s good. But it is...

If that is the case, it´s good.

But it is truly stated in an interview with the CEO Arne Roland after CHC last week press conference that they follow a maintenance program where the gearbox at...
Forum: Rotorheads
5th Jun 2016, 18:39
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Hi, the systems for an aircraft has to be...

Hi,

the systems for an aircraft has to be fault-proof

the same is valid for the maintenance

I assume that the gearbox is test driven (as claimed) to the extent
that any damage due to the...
Forum: Rotorheads
3rd Jun 2016, 14:35
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I am looking back in the Super Puma gearbox...

I am looking back in the Super Puma gearbox overhaul history.

For the A332 L1 MGB it is written about the TBO which is 3000 hours.

It was yesterday said on the press conference by CHC
that the...
Forum: Rotorheads
3rd Jun 2016, 11:25
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

These are the civilian operators I know ...

These are the civilian operators I know

Airtelis Switzerland

SonAir Spain


Could be others as well?

Not referring to police or military
Forum: Rotorheads
2nd Jun 2016, 14:19
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

CHC held press conference

CHC-sjefen: - Vi har ikke tilgang til girkassen - Bergens Tidende (http://www.bt.no/nyheter/lokalt/CHC-sjefen---Vi-har-ikke-tilgang-til-girkassen-3607349.html)

Short summary
Gearbox changed in...
Forum: Rotorheads
2nd Jun 2016, 13:32
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

I agree, but that assume you have information...

I agree, but that assume you have information that the gearbox was changed as claimed?

May I ask how you know that for sure?
Forum: Rotorheads
2nd Jun 2016, 12:53
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

It is relevant to anyone who would like to...

It is relevant to anyone who would like to understand the cause of the breakdown incident.

If you are sure that the MGB and MRH was changed at the dates claimed,
I agree its irrelevant to you.
...
Forum: Rotorheads
2nd Jun 2016, 11:43
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Also, Main gearbox Main rotor assembly ...

Also,

Main gearbox
Main rotor assembly

Is the epicyclic module separate or included in one of those two units,
when they are changed?
Forum: Rotorheads
2nd Jun 2016, 11:41
Replies: 1,949
Views: 1,584,058
Posted By turboshafts

Does it mean that contaminated oil from the old...

Does it mean that contaminated oil from the old epi
can also come in and deteriorate in an new MGB if not
clean/flushed out sufficiently? or are there separate lubrication circuits?
Showing results 1 to 35 of 40
 
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