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Search: Posts Made By: Owain Glyndwr
Showing results 1 to 35 of 41
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Forum: Tech Log
25th Nov 2013, 18:11
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Dozy, I don't think you would include me as...

Dozy,

I don't think you would include me as one of "the usual suspects"; at least I hope not!
Thanks to HN39 I have just acquired a copy of the Experts Report, and although I have not had time to...
Forum: Tech Log
23rd Nov 2013, 16:47
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Hi Chris I see I crossed with HN39 in...

Hi Chris

I see I crossed with HN39 in cyberspace, but still :-

I don't think you are going to do any better than section 1.16.4.2 of the final report. That says AI did special post-accident...
Forum: Tech Log
22nd Nov 2013, 15:13
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

BOAC My point, not very clearly expressed,...

BOAC

My point, not very clearly expressed, was really that 'forward speed' is an expression of Dozy's; I am sure that AB's engineers knew and know very well that it is the total air speed over the...
Forum: Tech Log
22nd Nov 2013, 08:26
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

BOAC With all due respect to Dozy,...

BOAC



With all due respect to Dozy, using his terminology to infer AB's thought processes is rather a big assumption :D
Forum: Tech Log
21st Nov 2013, 07:15
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@ Clandestino, Dozy That agrees with...

@ Clandestino, Dozy



That agrees with my understanding of information obtained from the horse's mouth.
The 'wiki' comment probably arises because the A320 oleo design was changed to reduce the...
Forum: Tech Log
20th Nov 2013, 17:23
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@Dozy Nearly but not quite: Checking...

@Dozy

Nearly but not quite:

Checking back on my source data another AI mod was to apply a small amount of dumper deflection immediately at touchdown, which killed enough lift to trigger braking...
Forum: Tech Log
20th Nov 2013, 16:43
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Dozy That of course is a totally...

Dozy


That of course is a totally different application. For the record (I don't want to introduce another thread drift) it wasn't that WOW timing was adrift.Rather it was that the aircraft...
Forum: Tech Log
20th Nov 2013, 13:59
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

BOAC I don't think I implied that you were...

BOAC

I don't think I implied that you were arguing about responsibility - if I gave that impression then my apologies. Nobody is going to contradict a statement about the S/W anomalies being a...
Forum: Tech Log
20th Nov 2013, 09:34
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@BOAC Firstly let me say that I am NOT...

@BOAC

Firstly let me say that I am NOT arguing that the A330 design does not need any change - on the contrary I think the stall warning logic should be altered. However the discussion relating...
Forum: Tech Log
13th Nov 2013, 16:41
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Thanks A33Zab

Thanks A33Zab
Forum: Tech Log
13th Nov 2013, 07:12
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Confiture OK, so in your view he intended to...

Confiture
OK, so in your view he intended to cancel any thrust increase from Alpha-Floor if it triggered but this intention was overtaken by events when he applied TOGA thrust too early (for...
Forum: Tech Log
12th Nov 2013, 17:51
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

vilas So may we know what it is please?

vilas


So may we know what it is please?
Forum: Tech Log
12th Nov 2013, 16:57
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@vilas So is there a formal AI mod and an...

@vilas


So is there a formal AI mod and an associated FCOM change?
Forum: Tech Log
12th Nov 2013, 16:33
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@A33Zab Thank you A33Zab, that is very...

@A33Zab


Thank you A33Zab, that is very helpful and new to me.

Presumably, since the MOI is advanced operational information there will be an official accompanying SB and an FCOM change if and...
Forum: Tech Log
12th Nov 2013, 15:08
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@vilas Thank you, but a little more detail...

@vilas

Thank you, but a little more detail would be helpful since I cannot trace anything on the 'net'
Do you have a URL where the whole article can be read? Who is the MOI published by?
Airbus?...
Forum: Tech Log
12th Nov 2013, 15:04
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Eyes wide shut - but not foolishly I hope ;)

Eyes wide shut - but not foolishly I hope ;)
Forum: Tech Log
12th Nov 2013, 07:22
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@Confiture OK, but for my information what...

@Confiture

OK, but for my information what would these additional steps have been?

Following on from that, would these steps have been known to the pilot? If they were then why did he not apply...
Forum: Tech Log
11th Nov 2013, 19:10
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@Confiture Ten lines later it says that the...

@Confiture
Ten lines later it says that the A/THR was disconnected immediately after take off and twenty one lines later it records that between 50 and 40 ft AGL the CdB confirmed that the A/THR was...
Forum: Tech Log
11th Nov 2013, 16:49
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@vilas Could you post a link to that MOI...

@vilas

Could you post a link to that MOI please? I don't think I have ever met the term before.

@Confiture

Quote?

Final Report of the Commission d'Enquete on the accident: Section 1.11.3
Forum: Tech Log
9th Nov 2013, 17:55
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

The problem is, or was, that you are, or were,...

The problem is, or was, that you are, or were, claiming that HN39 was wrong to suggest that the aircraft would pitch up with neutral sidestick in certain circumstances.

If you want to say that it...
Forum: Tech Log
9th Nov 2013, 16:40
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Vilas, I think you will find that HN39...

Vilas,

I think you will find that HN39 understands flight mechanics as well as any writing in these pages.
Although I agree with much of what you write, I think you nevertheless have some things...
Forum: Tech Log
2nd Nov 2013, 07:18
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Machinbird We seem to have been...

Machinbird



We seem to have been slightly at cross purposes. My remarks were aimed specifically at the minimal changes necessary to fix the stall warning anomaly whereas I now recognise that...
Forum: Tech Log
1st Nov 2013, 19:25
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Well that would clear up one mystery!

Well that would clear up one mystery!
Forum: Tech Log
1st Nov 2013, 18:49
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@Dozy Which is what they did of course! ...

@Dozy
Which is what they did of course!

@Chris Scott


Reason for that is that with the pretty well universal right handed system of axes used to describe airplane motions a clockwise (nose...
Forum: Tech Log
1st Nov 2013, 18:08
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

A33Zab Now that sounds a very sensible...

A33Zab


Now that sounds a very sensible answer :ok:
Forum: Tech Log
1st Nov 2013, 16:50
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

No, that is stall for a completely clean airframe...

No, that is stall for a completely clean airframe (slats and flaps retracted) at low Mach No.
Forum: Tech Log
1st Nov 2013, 15:12
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@OK465 The straight answer is that I don't know...

@OK465
The straight answer is that I don't know :O Partly because I'm not sure what "alpha lock" entails and partly because the recorded behaviour of the engines is consistent with an 'alphafloor'...
Forum: Tech Log
1st Nov 2013, 14:39
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Hang on a minute! Suppose it is an A320 at say 60...

Hang on a minute! Suppose it is an A320 at say 60 tonnes - holding at 200 kts?
That will be about 5.5 deg AoA with stall at 12 deg. The alphaprotect logic is a combination of alpha and rate of...
Forum: Tech Log
1st Nov 2013, 10:47
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

DonH As a retired designer, I have to...

DonH



As a retired designer, I have to agree with your assessment here. In order to design an aircraft one has to make certain assumptions. One of those is that the pilots will fly like - errr...
Forum: Tech Log
1st Nov 2013, 10:31
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Sorry Chris, but the likes of Owain Glyndwr have...

Sorry Chris, but the likes of Owain Glyndwr have no explanation other than the obvious; that the logic designed to protect against stall at low Mach numbers had unexpected side effects when applied...
Forum: Tech Log
1st Nov 2013, 10:04
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@machinbird Yes that must be true. It is a...

@machinbird

Yes that must be true. It is a case where the "requisite imagination" failed to envisage such a case as a necessary condition. But if some engineer had dared to suggest before...
Forum: Tech Log
27th Oct 2013, 07:13
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

@A33Zab Thank you for that...

@A33Zab



Thank you for that information; I suspected something along those lines.

Left me wondering if fluid damping, which is proportional to velocity squared, is more effective than eddy...
Forum: Tech Log
26th Oct 2013, 18:10
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

Ozlander I beg to differ - ground speed...

Ozlander
I beg to differ - ground speed correlates directly with airspeed in level flight and zero wind conditions.

If you have been following earlier exchanges on the various threads of this...
Forum: Tech Log
26th Oct 2013, 10:57
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

rudderrudderrat OK, I accept the case, but I...

rudderrudderrat

OK, I accept the case, but I think the vanes would go to one or other of their mechanical stops not rotate through 180 deg.

That said, refer to my edited version of my previous...
Forum: Tech Log
26th Oct 2013, 10:09
Replies: 976
Views: 217,051
Posted By Owain Glyndwr

rudderrudderrat And never will, but in this...

rudderrudderrat

And never will, but in this case (take-off) we were addressing a situation where there were no system failures, just vanes moving as a result of atmospheric turbulence I think.
...
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