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Search: Posts Made By: Owain Glyndwr
Showing results 1 to 35 of 46
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Forum: Tech Log
11th Aug 2017, 09:45
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@OK465 I agree with you! At our age carping...

@OK465

I agree with you! At our age carping can be a waste of valuable time :-)
I was surprised by your remark on the effect of airspeed decay rate on deterrent buffet level. I think I have read...
Forum: Tech Log
10th Aug 2017, 09:22
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

There appears to be some misunderstanding of the...

There appears to be some misunderstanding of the character of high altitude/high Mach No stalls on current transport aircraft. On designs using supercritical wing sections on which upper surface flow...
Forum: Tech Log
8th Jun 2017, 05:14
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@tdracer You have a slight advantage over me in...

@tdracer
You have a slight advantage over me in that I only spent 37 years on the design side, but I would have been laughing along with you. With the caveat that it was allowing the aoa to develop...
Forum: Tech Log
26th Feb 2017, 22:38
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

I wasn't defending anything, merely trying to...

I wasn't defending anything, merely trying to answer your question as to what effect THS inhibition might have had.
I should have known better than to offer facts to a lawyer - a mistake I won't...
Forum: Tech Log
26th Feb 2017, 18:58
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

IOW, what does "when stall protection became...

IOW, what does "when stall protection became active" have to do with this initial, and ultimately unrecoverable Stall

You are correct, in that protections are lost in alternate law, so my remark...
Forum: Tech Log
26th Feb 2017, 17:40
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

As I said, the THS takes its commands from the...

As I said, the THS takes its commands from the elevator position. Look at Fig.63 of the report. When the THS was moving towards a NU trim the elevator was ALWAYS negative (nose up command). I...
Forum: Tech Log
26th Feb 2017, 15:25
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

You are putting words in my mouth again! I said...

You are putting words in my mouth again!
I said nothing about the graphs being "disparate". I simply said that without knowing the gains one could not calculate the final deflection.
As a lawyer,...
Forum: Tech Log
23rd Feb 2017, 17:33
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

Machinbird The TO CG was 23.3%, so that...

Machinbird

The TO CG was 23.3%, so that would tie up with your approx. 5% from the trim tank.
Yes, 205kg x 1000 is 205 tonnes. Trim tank holds 4800 kg which would give a bit more than 5% shift at...
Forum: Tech Log
23rd Feb 2017, 15:41
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

The BEA Final Report states that at the time of...

The BEA Final Report states that at the time of the accident the CG was 28.7%
Forum: Tech Log
18th Feb 2017, 11:39
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

roulis It's difficult to get a litre of wine...

roulis
It's difficult to get a litre of wine into a standard 75cl bottle!
Forum: Tech Log
16th Feb 2017, 16:56
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

The delay I was referring to is the internal DFDR...

The delay I was referring to is the internal DFDR delay - maybe quarter to half a second, no more than that. It was simply to explain why it might be read that there was a whole second between his...
Forum: Tech Log
15th Feb 2017, 15:36
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@Concours77 Look, I'm not going to get into...

@Concours77

Look, I'm not going to get into a fruitless discussion on things which have already been covered time and time again in the twelve AF447 threads and the relevant official documents. If...
Forum: Tech Log
14th Feb 2017, 21:03
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

When did They know and what's missing from the...

When did They know and what's missing from the CVR?

All this was described in second by second detail in the FIRST expert's report, but that has never, to my knowledge, been translated into...
Forum: Tech Log
14th Feb 2017, 16:51
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

Concours77 It might be a good idea for you...

Concours77

It might be a good idea for you to get your niece to translate the definitive (French) version of the Final Report which differs from the English version in several respects.

In...
Forum: Tech Log
6th Oct 2016, 08:05
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@ Chris Scott, safetypee Interesting...

@ Chris Scott, safetypee

Interesting discussion but don't forget

JAR 25.207 Stall warning

(a)
(b) The warning may be furnished either through the inherent aerodynamic qualities of the...
Forum: Tech Log
30th Sep 2016, 15:11
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

The bold wording describes how the system...

The bold wording describes how the system operates when supplied with valid aoa data.- as I am sure you understand very well. A stall warning system that uses aoa as a primary input cannot function...
Forum: Tech Log
30th Sep 2016, 08:39
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

I agree with you that the airspeed was well above...

I agree with you that the airspeed was well above 60 kts and that the AOA signals were in reality valid. My point is that if the vane manufacturers had declared their equipment to be reliable only...
Forum: Tech Log
29th Sep 2016, 15:54
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@Confiture If you read Chris Scotts posting...

@Confiture

If you read Chris Scotts posting 1107 you will see that the discussion related to the 60kt validity limit not the maximum angle the vane could read so your remarks aren't really...
Forum: Tech Log
26th Sep 2016, 07:33
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

When the AD design team for Airbus FBW at Saint...

When the AD design team for Airbus FBW at Saint Martin-du-Touch (?) decided in the mid-1980s to opt for invalidating AoA data at IAS < 60 kt (assuming my memory serves), were they:
(1) just playing...
Forum: Tech Log
26th Oct 2014, 07:58
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

OK, my original wording was not very clear. What...

OK, my original wording was not very clear. What I had in mind was that in alternate this THS movement inhibition could be triggered by stall warning rather than alpha protection. Only AOA data...
Forum: Tech Log
16th Oct 2014, 08:20
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

OK, but remember that the pilot won't be the one...

OK, but remember that the pilot won't be the one to hold the elevator, the EFCS will do that - you just won't get it bled off by THS movement
Forum: Tech Log
16th Oct 2014, 07:46
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

Maybe, but a sensible limit would be...

Maybe, but a sensible limit would be "configuration conscious". 2 or 3 ANU might be fine for cruise, but full flap, extreme fwd CG and Vref with a modest allowance for a steady turn might need 12 deg...
Forum: Tech Log
15th Oct 2014, 21:08
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

Dozy I have an apology and a confession to...

Dozy I have an apology and a confession to make:http://www.pprune.org/images/editor/smilie.gif
You have mentioned several times recently that the A320 has a feature where NU THS movement is...
Forum: Tech Log
14th Oct 2014, 17:39
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

No its not. If the pilot makes a change of state...

No its not. If the pilot makes a change of state that requires elevator deflection and then releases the stick the elevator will remain at the deflection required to maintain the new flight condition...
Forum: Tech Log
14th Oct 2014, 17:21
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

No Dozy, the THS will move to reduce sustained...

No Dozy, the THS will move to reduce sustained elevator deflection at any speed
Forum: Tech Log
14th Oct 2014, 16:07
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@RetiredF4 There is a problem in that the...

@RetiredF4
There is a problem in that the manuals are not issued to the crew by Airbus.
In that “Counter Experts” report you will find the following (my apologies for leaving it in French, but I...
Forum: Tech Log
14th Oct 2014, 14:10
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@Gysbreght That is essentially what I am...

@Gysbreght

That is essentially what I am saying - handling qualities must be matched to probability and seriousness of failure consequences
Forum: Tech Log
14th Oct 2014, 12:19
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

Gums, I agree – in direct law the conditions that...

Gums, I agree – in direct law the conditions that gave rise to the special condition do not apply so the aircraft has to meet JAR25.173 and 25.175 as written. It is certificated, so it must meet...
Forum: Tech Log
13th Oct 2014, 10:57
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@infrequently flier Well...

@infrequently flier





Well obviously the certificating authorities (all ten of them together IIRC) thought so!
Forum: Tech Log
13th Oct 2014, 05:58
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

Hi rrr, Well of course the document you...

Hi rrr,


Well of course the document you reference is an AC not a requirement, but the answer to your question I think is that there is a Special Condition for A330/A340 certification against JAR...
Forum: Tech Log
12th Oct 2014, 16:07
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

The Airbus FCOM says, for normal law [1.27.20 p2]...

The Airbus FCOM says, for normal law [1.27.20 p2]


<When angle of attack protection is active, THS is limited between setting at entry in protection and 2 deg nose down (i.e. further nose up trim...
Forum: Tech Log
10th Oct 2014, 07:11
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

I'm afraid Dozy rather jumped the gun there - my...

I'm afraid Dozy rather jumped the gun there - my unpolished translation was a PV not intended for general consumption - well not yet anyway.


The complete, relevant French version is this: native...
Forum: Tech Log
4th Oct 2014, 17:16
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@vilas Could you post a URL for the...

@vilas


Could you post a URL for the article?
Forum: Tech Log
3rd Oct 2014, 18:16
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@Machinbird [If the the aircraft averages...

@Machinbird


[If the the aircraft averages ~10 degrees wing down for the duration of the simulation, then it will be flying through a different part of a turbulent air mass, and the assumptions...
Forum: Tech Log
3rd Oct 2014, 06:18
Replies: 1,678
Views: 532,559
Posted By Owain Glyndwr

@Machinbird I tend to disagree when you...

@Machinbird

I tend to disagree when you suggest the hands off calculation is highly speculative.
The excellent match between DFDR and the hands on calculation shows that the wind/gust/control...
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