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Search: Posts Made By: sensor_validation
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Forum: Tech Log
27th May 2011, 08:20
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Sorry, I don't fancy designing a sensor to...

Sorry, I don't fancy designing a sensor to measure multiphase flow through the drain holes - got to cope with climbing through heavy rain just after take-off as well as the current hot topic of high...
Forum: Tech Log
26th May 2011, 20:45
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Lonewolf_50 The airprox report is summarized...

Lonewolf_50

The airprox report is summarized in this post

http://www.pprune.org/tech-log/449639-af-447-search-resume-part2-42.html#post6434021

and the UK AAIB report can now be found...
Forum: Tech Log
26th May 2011, 12:40
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Don't under-estimate Airbus engineers, 3 sensors,...

Don't under-estimate Airbus engineers, 3 sensors, median filters, time delays are all included to minimize false alarms, but what is left is the remote possibility that any 2 may fail in exactly the...
Forum: Tech Log
26th May 2011, 10:08
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Good point, most cars these days use thermal...

Good point, most cars these days use thermal massflow sensor to measure air flow to calculate fuel injection times. There's normally a flap valve on inlet to take in warm air on start-up to speed up...
Forum: Tech Log
26th May 2011, 08:27
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Hot wire anemometers are used a lot in wind...

Hot wire anemometers are used a lot in wind tunnels, I am only familiar with the type that run at constant temperature/resistance - then the input power is direct measure of the heat loss via...
Forum: Tech Log
25th May 2011, 19:52
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Apologies if posted before but details of release...

Apologies if posted before but details of release on Friday now up on BEA site
Forum: Tech Log
25th May 2011, 08:51
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Pitot tube measure airspeed via dynamic pressure,...

Pitot tube measure airspeed via dynamic pressure, this is also what the wings use to generate lift. Measuring air molecule approach speed (laser?) will still need air density from static pressure...
Forum: Tech Log
24th May 2011, 22:53
Replies: 2,546
Views: 933,240
Posted By sensor_validation

I wonder if the WSJ author's have just watched...

I wonder if the WSJ author's have just watched the year old BBC/Nova documentary?

No mention of a control system protection triggered zoom-climb for a while?
Forum: Tech Log
15th May 2011, 22:12
Replies: 2,546
Views: 933,240
Posted By sensor_validation

It was posted earlier in these threads that...

It was posted earlier in these threads that Heating is ON full any time weight off the landing gear. Wind Chill on the outside of the Pitot means that it can never get much above ambient whatever...
Forum: Tech Log
15th May 2011, 06:40
Replies: 2,546
Views: 933,240
Posted By sensor_validation

The A300 FCOM mentions 28VDC and 320W, but the...

The A300 FCOM mentions 28VDC and 320W, but the actual power deliverable will not be constant. The probe heaters are made out of resistance wire, the actual resistance changes with temperature, so...
Forum: Tech Log
14th May 2011, 20:18
Replies: 2,546
Views: 933,240
Posted By sensor_validation

I'm sure I will be corrected if wrong, but I...

I'm sure I will be corrected if wrong, but I believe the issue with pitot tube heating is only when on the ground - no problem dissipating 300+ W when exposed to cold flight-speed air, but they'd...
Forum: Tech Log
11th May 2011, 14:50
Replies: 2,546
Views: 933,240
Posted By sensor_validation

I think we can safely assume the grid marks are...

I think we can safely assume the grid marks are 60,10,5 seconds. - check the RA lasted 27 seconds, and max rate of climb 6000ft/min.

The elevator action presumably triggering the pitch response...
Forum: Tech Log
11th May 2011, 08:24
Replies: 2,546
Views: 933,240
Posted By sensor_validation

It is strange to me that the violent manoeuvre by...

It is strange to me that the violent manoeuvre by the A340 is assumed possible but very rare so the main recommendation was to not closely stack planes vertically just in case a lower one decides to...
Forum: Tech Log
10th May 2011, 19:55
Replies: 2,546
Views: 933,240
Posted By sensor_validation

AF447 reported position to AF HQ via ACARS...

AF447 reported position to AF HQ via ACARS Satellite comms, every 10 mins. In amongst the alarm messages in one of the BEA interim reports is the 02:10 entry received at 2:10:34
...
Forum: Tech Log
10th May 2011, 18:38
Replies: 2,546
Views: 933,240
Posted By sensor_validation

The UK AAIB have just re-published the 2001...

The UK AAIB have just re-published the 2001 report of the October 2000 near miss between an A330 and a A340

Airbus A330 C-GGWD and Airbus A340 TC-JDN

including the DFDR figures in the...
Forum: Tech Log
10th May 2011, 12:51
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Don't you find the evidence posted by BEA...

Don't you find the evidence posted by BEA compelling? It is pretty clear that AF459 could see a similar picture to that portrayed and took evasive action.

Flight Paths of Flight AF 447 and of the...
Forum: Tech Log
10th May 2011, 08:32
Replies: 2,546
Views: 933,240
Posted By sensor_validation

We do not yet know actual height, air...

We do not yet know actual height, air temperature, windspeed or Mach No. Ground speed is not that precise as the exact time of transmission seemed to vary, apparently slipping by 15 seconds...
Forum: Tech Log
9th May 2011, 20:36
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Trade kinetic energy 1/2 m v^2 for gravitational...

Trade kinetic energy 1/2 m v^2 for gravitational potential energy mgh - the m's cancel.
Forum: Tech Log
9th May 2011, 18:17
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Watch out Tim's work was produced very early on...

Watch out Tim's work was produced very early on when it was assumed the Brazilian navy had a location for the final ACARS message - which later turned out to only be extrapolated, and now some 30NM...
Forum: Tech Log
9th May 2011, 08:15
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Sorry, don't follow - the cabin alt is controlled...

Sorry, don't follow - the cabin alt is controlled at max 8000ft equivalent, this will only rise rapidly due to a breach in the pressure vessel - potentially triggering that ACARS message. Surely...
Forum: Tech Log
8th May 2011, 23:00
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Old article here giving some general details...

Old article here giving some general details about GE engine monitoring

MRO USA: Engine diagnostics: GE opens the envelope...
Forum: Tech Log
5th May 2011, 19:15
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Not seen any real detail about GE real time...

Not seen any real detail about GE real time monitoring of AF447 engines, but by 2006 they received "thousands of data messages from aircraft each day" with >9000 aircraft monitored...
Forum: Tech Log
5th May 2011, 17:34
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Good question - it was the APU sorry!

Good question - it was the APU sorry!
Forum: Tech Log
5th May 2011, 16:10
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Takata - Engines run on the ground or in...

Takata - Engines run on the ground or in testbeds without airspeed, wouldn't a modern FADEC with sensitive surge protection managing fuel flow maintain operation even where there is not enough air...
Forum: Tech Log
29th Apr 2011, 17:13
Replies: 2,546
Views: 933,240
Posted By sensor_validation

The BEA again have a non reduite version of the...

The BEA again have a non reduite version of the image, more pixels but no more detail I feel

http://www.bea.aero/fr/enquetes/vol.af.447/images/apu.jpg
Forum: Tech Log
28th Apr 2011, 09:35
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Dumb insensitive British press at its worst ...

Dumb insensitive British press at its worst

Robot submarines find part of Air France jet black box 13,000ft under Atlantic | Mail Online...
Forum: Tech Log
27th Apr 2011, 20:19
Replies: 2,546
Views: 933,240
Posted By sensor_validation

Its the pitot tube sticking out of the bed at...

Its the pitot tube sticking out of the bed at 12-O'Clock (with shadow) that leaps out at me...

http://www.bea.aero/fr/enquetes/vol.af.447/images/chassis.fdr.site.jpg
Forum: Tech Log
27th Apr 2011, 08:05
Replies: 2,546
Views: 933,240
Posted By sensor_validation

From the published US patent application ...

From the published US patent application



The incorporated French patent submitted Sep 23, 2009
Showing results 1 to 28 of 28


 
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