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Search: Posts Made By: HarryMann
Showing results 1 to 35 of 92
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Forum: Tech Log
25th Sep 2009, 01:17
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Thanks cribbagepeg, good account, makes sense

Thanks cribbagepeg, good account, makes sense
Forum: Tech Log
15th Sep 2009, 11:26
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

But isn't that what often creates an accident -...

But isn't that what often creates an accident - the unexpected co-incidence of several contributory factors - or a sequence of (likely or expected) events occuring in an unexpected or rare order.
...
Forum: Tech Log
14th Sep 2009, 21:16
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

OK, just a tad :) The point surely, is...

OK, just a tad :)

The point surely, is whether the Cert requirements stipulate manual handling capability to be demonstrated in such a potentially degraded aircraft at night, in turbulence, up...
Forum: Tech Log
14th Sep 2009, 10:36
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Yes, it was certified of course; then withdrawn...

Yes, it was certified of course; then withdrawn for a few months while very extensive investigation was made of every possible aspect that might have brought down G-ALYP out of Ciampino. Quite a few...
Forum: Tech Log
12th Sep 2009, 10:05
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Surely it is just those conditions, and the...

Surely it is just those conditions, and the 'relative flyability' that is being investigated and quantified by BEA and Airbus as we speak. It's certainly something that from the uncertainty evinced...
Forum: Tech Log
7th Sep 2009, 10:54
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

No, not aware, thanks. Which (degraded)...

No, not aware, thanks.

Which (degraded) control law were they assuming?

Was this in still air or simulated turbulence?

PJ2 and others estimate c.of g. @ 37% ~ 2% fwd of aft limit at the...
Forum: Tech Log
7th Sep 2009, 01:23
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

That's interesting, my first response to >39% was...

That's interesting, my first response to >39% was the correct one, then by context misjudged it to mean fwd of . Mr Semantic-Pragmatic here, maybe it should be looked at - aft/fwd of are not big...
Forum: Tech Log
6th Sep 2009, 22:18
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Many Thanks I take it c.g. > ## implies...

Many Thanks

I take it c.g. > ## implies forward of :)

Yes, that's what I meant - I don't think either of us had conceived the idea that an event was likley initiated by a trim-tank or c.g....
Forum: Tech Log
6th Sep 2009, 12:17
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Indeed, I also highlighted this point a couple of...

Indeed, I also highlighted this point a couple of times back in the thread... unfortunately there doesn't seem to be much acceptance that it could have played a significant role as the systems...
Forum: Tech Log
14th Aug 2009, 00:41
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Would they ? The engines would, a centre section...

Would they ? The engines would, a centre section section wouldn't tumble 'that*' fast, with main wing panels attached.

*What is 'high speed'?

Would it? More likely if striking as a whole unit ?...
Forum: Tech Log
11th Aug 2009, 21:59
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

No, they don't, certainly not explicitly, maybe...

No, they don't, certainly not explicitly, maybe read this thread back a bit first to get some proper background.
Forum: Tech Log
11th Aug 2009, 14:25
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Yes, but surprisingly those wings were thinner,...

Yes, but surprisingly those wings were thinner, less super-critical, more sweep and could well have had higher Mcrit, surprisingly - just less optimised for the 'exact' cruise condition and fuel...
Forum: Tech Log
11th Aug 2009, 11:07
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Not directly relevant but as far as rapid...

Not directly relevant but as far as rapid descents and dives are survivable and the likely results of such... here is a copy of a post elsewhere on this board...
Saha Air 707 loses 2 on climbout...
Forum: Tech Log
10th Aug 2009, 23:18
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Somebody's going to have to be a lot more...

Somebody's going to have to be a lot more specific before this rumour is taken seriously..

Under what configuration, trim, a/s and MNo did the suggested behaviour manifest?

Then we might be...
Forum: Tech Log
10th Aug 2009, 10:45
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

IF... Another outside odds 'fit' might be...

IF...

Another outside odds 'fit' might be that having to fly pitch and power once A/S seemed unreliable, if they followed AFM and did so, and if they realised their climb-rate, pulling the thrust...
Forum: Tech Log
10th Aug 2009, 10:35
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Maybe not unusual from a met aspect, but is it...

Maybe not unusual from a met aspect, but is it common to fly through the centre of such updrafts, which he also admits I believe, could have been topping out at 51,000 ft, having burst through the...
Forum: Tech Log
10th Aug 2009, 09:36
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Could it be, not the ACARS messages, but the...

Could it be, not the ACARS messages, but the method of transmission & reception that offers such data...
I have no knowledge of this technology and from what I've read previously and reasoning that...
Forum: Tech Log
9th Aug 2009, 22:14
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

IF...

IF 35,000 > 47,000 ft

4 minutes at 50 ft/s (a v. high thermal climb rate in the troposhere, 20 ft/s is quite normal)

If a/t out, manual flight, the throttles would need to be cut quick if...
Forum: Tech Log
9th Aug 2009, 21:55
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Unlikely indeed if we're talking subsonic well...

Unlikely indeed if we're talking subsonic well short of Mcrit
Forum: Tech Log
8th Aug 2009, 22:17
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

PJ2 Wow! :D What a shame a collection...

PJ2

Wow! :D

What a shame a collection of such erudite responses aren't going to be published in an Airline Aviation Safety Journal - or would there be no-one of any influence subscribing to...
Forum: Tech Log
8th Aug 2009, 11:35
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Pitot design ass u mptions?

There appears to be no laws of dynamic similarity that would make a scaling up of the whole pitot probe inaccurate and I'm stretching myself to think of a problem with a 50 or 100% bore increase....
Forum: Tech Log
6th Aug 2009, 11:10
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

PJ2 Thankyou. You're not the one in...

PJ2

Thankyou.

You're not the one in the firing-line, but I would then like to ask generally, how is the handing back of an aircraft to manual flight in what may inevitably be a 'less than...
Forum: Tech Log
6th Aug 2009, 02:15
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Back to stall handling...

Personally a lot of the comment and opinion on a good few pages recently, makes me 1) worried;
2) think that:

a) The bigger picture is how much 'real life', 'real stall' experience the handling...
Forum: Tech Log
27th Jul 2009, 02:53
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

That's a nomogram.. very clever things nomograms....

That's a nomogram.. very clever things nomograms. Reading them can sometimes be, er... 'less than obvious'. Drawing them up, even more so... :ugh:

===
I can see the good sense in the alt.hold...
Forum: Tech Log
26th Jul 2009, 11:48
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

ISA +40 Think I'm right in saying that if...

ISA +40

Think I'm right in saying that if you suddenly ran into +40, then your MCrit margin would in short term increase, thrust decrease, and stall margin decreases (?)

... until A/P A/T...
Forum: Tech Log
26th Jul 2009, 03:05
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

If that proves to have been the case, we would be...

If that proves to have been the case, we would be back again discussing similar issues to Turkish/Schipol - in an opposite sense though, both in height & speed. Namely - unnoticed degrading margins...
Forum: Tech Log
24th Jul 2009, 19:54
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

It's more hand than the arm, with a fashioned...

It's more hand than the arm, with a fashioned rest for the forearm, if we're talking sidestick?
Forum: Tech Log
24th Jul 2009, 17:32
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Is that 12 factorial or something :) A big number...

Is that 12 factorial or something :) A big number

I think BEA & others know pretty well how to group them into subgroups that helps though...
Forum: Tech Log
24th Jul 2009, 08:53
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Perhaps answers your question? Mayday ...

Perhaps answers your question?

Mayday
Yes, it would be expected, with some provisos

Drowning
When an a/c impacts very hard (and it seems likely it did) the cause of death would invariably be...
Forum: Tech Log
23rd Jul 2009, 17:43
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

I think the depths are an order of magnitude...

I think the depths are an order of magnitude greater, as is the search area...
Forum: Tech Log
23rd Jul 2009, 01:22
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

Very much due to the accuracy of CFD/Wind tunnel...

Very much due to the accuracy of CFD/Wind tunnel and other methods of quantifying whole a/c behaviour up to and beyond any likely flight conditions, test or operationally. The high Mach upper...
Forum: Tech Log
23rd Jul 2009, 00:50
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

If you're talking aerodynamically, then of...

If you're talking aerodynamically, then of course, behaviour outside the normal flight enveleope can be simulated. All the data e.g. mass/inertial distributions, lift, drag pitching moment of...
Forum: Tech Log
21st Jul 2009, 02:35
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

They may be governed by AW Requirements, but the...

They may be governed by AW Requirements, but the actual alpha and the interpretation of sufficient margin (which is what the question was getting at) is established first during design and...
Forum: Tech Log
20th Jul 2009, 00:59
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

DJ77 Surely that's a question for the aerod...

DJ77

Surely that's a question for the aerod and systems dept at AI. This wouldn't be a matter of 'stall' as much as initial buffet onset. Pilots wouldn't have much if any experience of flying into...
Forum: Tech Log
17th Jul 2009, 23:29
Replies: 4,593
Views: 3,295,314
Posted By HarryMann

It hasn't - that was a mistake before the DNA...

It hasn't - that was a mistake before the DNA analysis made it clear there had only been 50 (souls) found.
Showing results 1 to 35 of 92
 
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