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Search: Posts Made By: Mesoman
Showing results 1 to 35 of 61
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Forum: Questions
25th Dec 2016, 18:18
Replies: 14
Views: 4,602
Posted By Mesoman

ELT's do find survivors

In the US, Civil Air Patrol occasionally finds survivors from an ELT activation. In fact, ELT's tend to fail with crashes bad enough to kill all on board.

I remember one a few years back where a...
Forum: Safety, CRM, QA & Emergency Response Planning
9th Aug 2016, 16:39
Replies: 889
Views: 435,304
Posted By Mesoman

Why are they on sale? Because people want them...

Why are they on sale? Because people want them and they have uses. The lower powered ones are used for pointing out celestial objects during amateur astronomy, and I would suspect this usage results...
Forum: Rumours & News
6th Jun 2016, 01:31
Replies: 1,184
Views: 2,630,230
Posted By Mesoman

Per NASA, ELT's are picked up by GEOSAR and...

Per NASA, ELT's are picked up by GEOSAR and LEOSAR. I have not heard of GNSS satellites able to do this. Only LEOSAR can give a location unless the ELT transmitted location data.
Forum: Rumours & News
5th Jun 2016, 21:10
Replies: 1,184
Views: 2,630,230
Posted By Mesoman

I keep seeing reference to dye bags. I don't...

I keep seeing reference to dye bags. I don't think those will be of much use. Back in my P-3 days, we had Fluorescein dye in the sonobuoys. They were visible, but not that great, and they...
Forum: Rumours & News
1st Jun 2016, 19:50
Replies: 1,184
Views: 2,630,230
Posted By Mesoman

121.5/243.0 no longer used on Sats, at least by US

The 121.5/243.0 was shut down, at least for the US. All ELT's were supposed to transmit on 406 by 2009, so they stopped listening. Sadly, most ELT's in the US are still not on 406, which means now...
Forum: Rumours & News
1st Jun 2016, 02:35
Replies: 1,184
Views: 2,630,230
Posted By Mesoman

It looks like the COSPAS-SARSAT rules are not...

It looks like the COSPAS-SARSAT rules are not made for this kind of situation - where the ELT may be shortly submerged or destroyed but there is a very large interest in locating the wreckage,...
Forum: Rumours & News
22nd Mar 2016, 23:02
Replies: 88
Views: 69,167
Posted By Mesoman

For all the complaints about security and...

For all the complaints about security and security theater, it has succeeded in preventing another 9-11 style attack. We can never totally secure travel, but preventing hijacking is more important...
Forum: Rumours & News
30th Jan 2016, 04:09
Replies: 918
Views: 1,117,838
Posted By Mesoman

Wreckage may have been sighted, but could not be investigated

The initial aerial search efforts by sizeable numbers of multiple engine aircraft, with multiple searchers aboard - that produced precisely nothing - is what remains the most disconcerting feature...
Forum: Rumours & News
27th Jan 2016, 23:02
Replies: 918
Views: 1,117,838
Posted By Mesoman

The search isn't over yet

They still have a fair amount to search, and I'm really hoping they find it. From a Bayesian standpoint, though, the odds go down the longer they search.
Forum: Rumours & News
9th Dec 2015, 16:22
Replies: 918
Views: 1,117,838
Posted By Mesoman

Nothing new here

I agree with Mad (Flt) Scientist (http://www.pprune.org/members/58150-mad-flt-scientist) - the media story is just nonsense, as far as I can tell from reading the report. I see nothing new - just an...
Forum: Safety, CRM, QA & Emergency Response Planning
2nd Dec 2015, 15:55
Replies: 889
Views: 435,304
Posted By Mesoman

Laser protection

Lasers operate on fixed wavelengths - the bright green ones that eyes are most sensitive to are at 532nm. Safety glasses exist that strongly attenuate that wavelength without blocking much else. It...
Forum: Rumours & News
10th Nov 2015, 15:53
Replies: 2,082
Views: 2,494,894
Posted By Mesoman

other than a bomb...

A central fuel tank explosion would cause an instantaneous catastrophic failure. I don't know how that can be ruled out given what we know, although I presume actions taken after TWA800 have reduced...
Forum: Rumours & News
8th Nov 2015, 15:52
Replies: 2,082
Views: 2,494,894
Posted By Mesoman

Center fuel tank explosion?

How about a central fuel tank explosion similar to TWA800? Has that been completely prevented by actions taken since TWA800, or is it still a possibility? Such an explosion would explain all the...
Forum: Rumours & News
8th Nov 2015, 01:07
Replies: 2,082
Views: 2,494,894
Posted By Mesoman

Hmmm... FR24 + CVR

If you combine this information with the assertion that the CVR showed nothing unusual except a loud bang at the end...

Either that bang lasted a couple of seconds or the CVR was cut off before...
Forum: Rumours & News
7th Nov 2015, 16:29
Replies: 2,082
Views: 2,494,894
Posted By Mesoman

CVR Bandwidth

I looked at specs for a couple of CVR's. One had a bandwidth of 3kHz and the other 5kHz. The microphone bandwidth would likely have been higher.

This means that a sample of the sound (think...
Forum: Rumours & News
6th Nov 2015, 16:08
Replies: 2,082
Views: 2,494,894
Posted By Mesoman

Not conclusive

"He said the explosion would not be secondary to engine failure, which would remove the assumption of the accident."

This does not remove the possibility of an accident. For example, a fuel tank...
Forum: Tech Log
5th Nov 2015, 19:35
Replies: 205
Views: 43,070
Posted By Mesoman

Image processing

I don't think the main challenge is processor power these days, although that is an issue. The really hard part - still very much in the research area - is making sense of the image. These days,...
Forum: Tech Log
2nd Nov 2015, 15:57
Replies: 205
Views: 43,070
Posted By Mesoman

"Automation only computes, Humans reason."

"Automation only computes, Humans reason."

This is not true, and in the future computers will do even more reasoning. There are too many comments now which assume that computers only do what is...
Forum: Rumours & News
1st Nov 2015, 01:59
Replies: 2,082
Views: 2,494,894
Posted By Mesoman

"data sorted not by time (which we know is not...

"data sorted not by time (which we know is not reliable, as the timestamp is not from the aircraft)"

It is reported that the stations use GPS to time stamp their data. That means the time stamps...
Forum: Tech Log
29th Oct 2015, 01:52
Replies: 205
Views: 43,070
Posted By Mesoman

Strong AI systems

"I wonder how airline managers would react when the AI system refuses to fly because it assesses the conditions as being sub optimal for profit or safety?"

Retrain it? :) Seriously, if it made...
Forum: Tech Log
28th Oct 2015, 21:22
Replies: 205
Views: 43,070
Posted By Mesoman

Automation vs AI

"An automated control system may well have opted for heading for the nearest airport if the figures indicated it was possible to glide there. The automated system might then be caught out by...
Forum: Tech Log
27th Oct 2015, 02:22
Replies: 205
Views: 43,070
Posted By Mesoman

Yes, automation can handle unforseen events

Automation of very complex processes, such as autonomous cars (or aircraft) is not just a practice of thinking up every scenario and programming the autopilot to handle it.

Modern software is...
Forum: Rumours & News
7th Sep 2015, 01:27
Replies: 918
Views: 1,117,838
Posted By Mesoman

Magnetic detection

I used to be crew member on an ASW aircraft (P-3) which was equipped with magnetic anomaly detection - MAD, and I used to maintain the MAD equipment. The device was made as sensitive as possible. It...
Forum: Rumours & News
4th Sep 2015, 03:14
Replies: 918
Views: 1,117,838
Posted By Mesoman

Wave height measurements and drift hindcasting

As far as I know, the remote sensing for determining wave heights works indirectly. SAR (Synthetic Aperture Radar) and scatterometry (a form of SAR) can estimate surface winds. From a history of...
Forum: Rumours & News
16th Aug 2015, 00:51
Replies: 918
Views: 1,117,838
Posted By Mesoman

ELT's are not good, and not the solution for Air Transport

I've been involved in tracking down ELT's for 30 years. In my opinion, they are mostly junk. All but one that I found was a false alarm - usually triggered by a mechanic, or by being thrown in a...
Forum: Rumours & News
12th Jan 2015, 23:53
Replies: 3,923
Views: 4,442,279
Posted By Mesoman

Radar characteristics

"The signal needs to be of just the right strength to be partially reflected thus showing the WX. The snag is the weaker beam also suffers attenuation."

This is not true. All radar beams suffer...
Forum: Rumours & News
20th Jun 2014, 03:01
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

Virtual terminal location?

First, kudos to RichardC10 for an impressive job and no doubt a lot of hard work.

One item that I find odd is the 718 km altitude of the virtual terminal (VT). This seems a very unlikely choice...
Forum: Rumours & News
9th May 2014, 04:18
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

Woods Hole Expert

If the article is correct, this would be a bombshell.

But... I'd like to see someone else, or Woods Hole itself, corroborate this. After all, the pings were picked up by the experts using the TPL,...
Forum: Rumours & News
5th May 2014, 18:14
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

ULB propagation different from submarine

An important factor differentiating submarine sound propagation from ULB ping propagation is attenuation of the signal. At low frequencies used for submarine detection, there is virtually no...
Forum: Rumours & News
29th Apr 2014, 03:12
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

Anyone know about this?

A CNN 'expert' said that they had not searched the bottom near the area of the first and longest ping detect, because it was too deep for the Bluefin.

This certainly contradicts the impression I...
Forum: Rumours & News
24th Apr 2014, 23:32
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

The techies are probably right

As a techie who also has SAR experience, I think there is very strong evidence that the techies are right.

The INMARSAT ping data is pretty good - I doubt anyone just made it up for fun. Even...
Forum: Rumours & News
22nd Apr 2014, 02:03
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

Wreckage moving?

.


I really doubt this, but I'd love to hear from a maritime expert.

After a month on the bottom, it's unlikely it would still be tumbling. One would expect it to have reached a resting...
Forum: Rumours & News
17th Apr 2014, 02:09
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

Density, pressure

For the purposes of estimating safe pressures, the density of sea water is virtually constant (variation ~1%), and thus the pressure is mostly linear with depth.

The small variations in density in...
Forum: Rumours & News
13th Apr 2014, 22:41
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

AIS Report source

I have noticed that Echo and Ocean Shield report at the same time. This suggests that a proxy is providing the reports - perhaps AMSA.
Forum: Rumours & News
11th Apr 2014, 04:22
Replies: 11,831
Views: 24,191,683
Posted By Mesoman

Echo now in the box

Earlier someone noted that Ocean Shield was departing the acoustic search box at faster than detection speed.

Now, Echo is in the box and almost stationary (.5 kts) - suggesting that they may be...
Showing results 1 to 35 of 61
 
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