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Search: Posts Made By: DaveReidUK
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Forum: Rumours & News
24th Mar 2019, 07:41
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

This is in danger of becoming apochryphal. Can...

This is in danger of becoming apochryphal. Can anyone point to a verifiable reference to this supposed 4g pushover?

If not, I suggest we move on ...
Forum: Rumours & News
19th Mar 2019, 07:44
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

You must be reading a different article. ...

You must be reading a different article.

From the one that you linked to:



Which do you think is more likely to be something that the NTSB would actually say ?
Forum: Rumours & News
13th Mar 2019, 18:11
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

The airframe in question was a passenger aircraft...

The airframe in question was a passenger aircraft until a few years ago.
Forum: Rumours & News
12th Mar 2019, 22:50
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Are you saying that control column deflection was...

Are you saying that control column deflection was in fact an FDR parameter for the accident flight?
Forum: Rumours & News
12th Mar 2019, 22:38
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

It's more likely that nobody knows. The NTSB...

It's more likely that nobody knows. The NTSB didn't say that there was an absence of control column input. That suggests that they can't actually tell control column deflection from the FDR.
Forum: Rumours & News
12th Mar 2019, 20:49
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

AFAIK, control column deflection and control...

AFAIK, control column deflection and control force aren't mandatory FDR parameters per Annex 6.

So it may be that it was inferred from the elevator deflection (which is of course a mandatory...
Forum: Rumours & News
12th Mar 2019, 16:43
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

That might also account for why the NTSB aren't...

That might also account for why the NTSB aren't saying what's on the CVR.
Forum: Rumours & News
11th Mar 2019, 08:00
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Yes, the THS/jackscrew combination will be...

Yes, the THS/jackscrew combination will be familiar, of course, to anyone who has flown or worked on types such as the 737 or DC-9 over the past 50+ years.



I doubt that particular question...
Forum: Rumours & News
10th Mar 2019, 12:30
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Some aircraft do, the MD-80 for example. Google...

Some aircraft do, the MD-80 for example. Google Acme screw.
Forum: Rumours & News
9th Mar 2019, 07:42
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

In the photo, the jackscrew is resting on the...

In the photo, the jackscrew is resting on the actuator end and the broken-off stabilizer bracket. I don't think you can necessarily read too much into the position of the ballnut - if its threads had...
Forum: Rumours & News
9th Mar 2019, 06:41
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Given that we know the flightpath angle was...

Given that we know the flightpath angle was approaching -50°, a ROD of 200 m/s would resolve to a velocity of around 500 kts.

Hmmm.
Forum: Rumours & News
8th Mar 2019, 21:25
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

The references to 6", etc, are seconds into the...

The references to 6", etc, are seconds into the video, not inches.
Forum: Rumours & News
8th Mar 2019, 08:04
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

ATC stopped receiving the transponder signal...

ATC stopped receiving the transponder signal shortly before impact. That doesn't mean it had stopped transmitting at that point.

SSR data captured by FR24 continued up to around 2-3 seconds before...
Forum: Rumours & News
8th Mar 2019, 06:21
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

See post #316 from two days ago.

See post #316 from two days ago.
Forum: Rumours & News
7th Mar 2019, 20:13
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Bear in mind that when the Alaskan MD-80's...

Bear in mind that when the Alaskan MD-80's jackscrew let go, it pulled through the mechanical stop and just kept going. The elevators didn't make a blind bit of difference.
Forum: Rumours & News
7th Mar 2019, 18:38
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Despite being misinterpreted (wilfully?),...

Despite being misinterpreted (wilfully?), McGinty's post was perfectly clear.

He (or she) did not assert that the wings would fall off in a dive. :ugh:
Forum: Rumours & News
6th Mar 2019, 22:10
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

If by "two different things" you mean two...

If by "two different things" you mean two different frames of reference, then yes. File under "interesting, but irrelevant".
Forum: Rumours & News
6th Mar 2019, 17:56
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

I don't think anyone will disagree with that. A...

I don't think anyone will disagree with that. A screwjack/ballnut failure, on the other hand, could be implicated.
Forum: Rumours & News
6th Mar 2019, 17:06
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Yes, though that doesn't seem to be relevant to...

Yes, though that doesn't seem to be relevant to what actually happened.

A "zero G" descent (or indeed a descent at any constant vertical acceleration value) follows a parabolic profile (ask any...
Forum: Rumours & News
6th Mar 2019, 16:44
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Correct me if I'm wrong, but average vertical...

Correct me if I'm wrong, but average vertical acceleration would simply be a function of vertical distance travelled and time (if initial vertical velocity is zero).

6000' in 18 seconds gives a =...
Forum: Rumours & News
6th Mar 2019, 16:38
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

AD 2008-06-06. Still in force.

AD 2008-06-06. Still in force.
Forum: Rumours & News
6th Mar 2019, 11:37
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

While that might be true, more or less, for a...

While that might be true, more or less, for a control surface that's hinged at its leading edge (say an aileron), I don't think you can make that assumption for a THS where the pivot point certainly...
Forum: Rumours & News
3rd Mar 2019, 19:01
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

I don't see any reason why a team looking...

I don't see any reason why a team looking specifically for the FDR shouldn't have the (simple) means to remove the pinger, given that that's SOP.

Maybe they didn't need it, maybe they did.
Forum: Rumours & News
3rd Mar 2019, 13:06
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

No trade-off required. It's perfectly...

No trade-off required.

It's perfectly possible for a pinger to be both securely attached, so that it won't separate from the recorder in an impact, and also readily removable once its job is done...
Forum: Rumours & News
2nd Mar 2019, 21:33
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Typically the data plate (visible on the end of...

Typically the data plate (visible on the end of the unit in photo 2) will identify the part number and a description of whether it's a CVR and/or FDR.

The high-visibility legend FLIGHT DATA...
Forum: Rumours & News
1st Mar 2019, 20:34
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Correct. While you can plot a reasonably accurate...

Correct. While you can plot a reasonably accurate profile (altitude vs horizontal position) from the FR24 data, you can't reliably derive anything that's time-dependent as the timestamps (added to...
Forum: Rumours & News
28th Feb 2019, 23:06
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Not necessarily. If, for example, the...

Not necessarily.

If, for example, the forwardmost ULD hadn't been securely locked down, but those behind had, then the problem wouldn't have been apparent on take-off, but on descent.

We're not...
Forum: Rumours & News
26th Feb 2019, 16:05
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

That article is more than 18 months ago. It...

That article is more than 18 months ago. It doesn't offer any evidence for your assertion that Qatar Airways, or indeed any operator, is actually taking delivery of aircraft with ejectable flight...
Forum: Rumours & News
26th Feb 2019, 13:15
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

We were told, not that long ago, that the Lion...

We were told, not that long ago, that the Lion Air CVR wouldn't be found in the mud because the seabed conditions were so inhospitable. It was.

Ejectable recorders (in civil aircraft) aren't going...
Forum: Rumours & News
26th Feb 2019, 08:32
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Sorry, but it doesn't prove that at all. ...

Sorry, but it doesn't prove that at all.

Aside from the cost and feasibility considerations, discussed previously in these columns on a number of occasions, ejectable recorders in this instance...
Forum: Rumours & News
25th Feb 2019, 16:31
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

Yes, although the aircraft's trajectory, with at...

Yes, although the aircraft's trajectory, with at least some thrust being generated, would differ slightly from the purely ballistic trajectory of a thrown stone.

The last few points of the ADS-B...
Forum: Rumours & News
24th Feb 2019, 17:53
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

I thought it was only the Air Force that...

I thought it was only the Air Force that supposedly forgot to defrost the birds before the test ... ?
Forum: Rumours & News
24th Feb 2019, 12:47
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

I did warn that the previous plot was...

I did warn that the previous plot was foreshortened ...

Here it is in profile:

https://cimg3.ibsrv.net/gimg/pprune.org-vbulletin/864x362/5y3591b_e290b6503f2a3b1b611bc6e3678921233159755e.jpg
...
Forum: Rumours & News
24th Feb 2019, 11:21
Replies: 920
Views: 2,318,292
Posted By DaveReidUK

The FR24 data, as usual, contains numerous...

The FR24 data, as usual, contains numerous artifacts and synchronisation issues.

That said, once cleaned up it appears to show a slight but unmistakeable climb interrupting the descent just before...
Showing results 1 to 34 of 34


 
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