PPRuNe Forums - Search Results
PPRuNe Forums

Go Back  PPRuNe Forums > Search Forums
Reload this Page >

Search Results

Register
FAQ
Calendar
Wikiposts
Today's Posts
Search
Vendor Directory
 
Page 1 of 2
1
2
Search: Posts Made By: sensor_validation
Showing results 1 to 35 of 37
Search took 0.00 seconds.
Forum: Tech Log
23rd Apr 2011, 10:18
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

You can tell that the data used for the AF447 is...

You can tell that the data used for the AF447 is the 'nearest 10 minute +/-0.3NM accuracy' from ACARS, time in seconds past 01/06/09 00:00:00
...
Forum: Tech Log
22nd Apr 2011, 14:46
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

I think you need to look at the time of the...

I think you need to look at the time of the incident and the time the search really going - more than 7 hours later? - i suspect the wreckage was 'over the horizon' W/NW of the LKP when they first...
Forum: Tech Log
21st Apr 2011, 09:11
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Time-stamped 2:10, received 2:10:34, so...

Time-stamped 2:10, received 2:10:34, so presumably the actual position at 2:10:30? slotting in as high priority message in the initial bunch of errors, re-presented here

AF447 ACARS MESSAGES -...
Forum: Tech Log
19th Apr 2011, 20:13
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Nothing new, just referring back to much...

Nothing new, just referring back to much discussed effect of locked in pressure (ram and drain hole blocked *) - the 'apparent indicated airspeed' rises with altitude. Obviously most dangerous under...
Forum: Tech Log
19th Apr 2011, 18:02
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Sorry for diversion - having seen Ewa Ewa sucked...

Sorry for diversion - having seen Ewa Ewa sucked into storm and lives to tell - National - smh.com.au (http://www.smh.com.au/news/national/dead-luck-ewas-flight-of-fury/2007/02/16/1171405421626.html)...
Forum: Tech Log
19th Apr 2011, 08:33
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Indeed - you also have to allow for wind speed,...

Indeed - you also have to allow for wind speed, and if you calculate distances between the history of 10 minute locations you get about 80nm per 10minutes - so the initial +40nm position was 5...
Forum: Tech Log
18th Apr 2011, 14:29
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

I'm sure you are right that it is significant...

I'm sure you are right that it is significant what happened just before 02:10z - did the auto controls take action on 'bad-data' before disconnecting, was a turn or step-climb in progress etc.

I...
Forum: Tech Log
18th Apr 2011, 10:18
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

To be fair they, and the Brazilian Navy, were...

To be fair they, and the Brazilian Navy, were originally trying to guess where the last message came from - based on 4 mins at 10 NM/min from the last position report, which was 3NM 'left of track'. ...
Forum: Tech Log
15th Apr 2011, 17:26
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

The original pictures are available on Sea search...

The original pictures are available on Sea search ops : wreckage images (http://www.bea.aero/en/enquetes/flight.af.447/images.du.site.php) - I guess the highest quality?

Are the 2 images both the...
Forum: Tech Log
13th Apr 2011, 18:19
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Not mentioned for a while - but if initial...

Not mentioned for a while - but if initial problem was caused by icing - what about the effect of ice crystals on the engines, did they somehow "roll back" meaning level flight with "pitch and power"...
Forum: Tech Log
12th Apr 2011, 16:11
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Note also the Flight plan was to climb to FL370...

Note also the Flight plan was to climb to FL370 around this point.
Forum: Tech Log
12th Apr 2011, 08:34
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Relevant both to the sort of problems mother...

Relevant both to the sort of problems mother nature can throw at us, and the amplifying effect of PIO on the rear vertical stabilizer...

The pprune thread...
Forum: Tech Log
6th Apr 2011, 19:12
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Of course many aircraft the same night did...

Of course many aircraft the same night did deviate, but given the likely weather pattern, to do so after 02:00 would surely have been too late? I didn't realize there was any doubt that AF447...
Forum: Tech Log
6th Apr 2011, 09:09
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Given the approx location of the debris, is the...

Given the approx location of the debris, is the fact that the 02:10:30 (assume this is exact time of position acquisition, transmission 4s later) location was "slighty west 3NM" of track INTOL -...
Forum: Tech Log
15th Jul 2010, 08:08
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

To a human pilot maybe, but apparently not for...

To a human pilot maybe, but apparently not for the auto-pilot



The classic case where blocked pitot tubes allow decreasing static pressure due to increasing altitude appear as increasing speed....
Forum: Tech Log
13th Jul 2010, 08:49
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Just to be pedantic - its triple pitot disagree,...

Just to be pedantic - its triple pitot disagree, which means only a double pitot failure. The third pitot may be working fine, but you have no way of knowing. The triple sensor system can only...
Forum: Tech Log
9th Jul 2010, 08:24
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Much discussion since first few days after...

Much discussion since first few days after accident that loss of control could have been caused by inappropriate "Pitch and Power" following disconnection of autopilot and auto-thrust - hence the...
Forum: Tech Log
28th Jun 2010, 22:40
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

No, the Auto thrust and Auto Pilot disengaged...

No, the Auto thrust and Auto Pilot disengaged because the speed measurements disagreed, which is most likely due to uneven blockage of pitot tubes and their drains due to ice.

Air properties and...
Forum: Tech Log
28th Jun 2010, 18:18
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

I am intrigued by this - the actual density of...

I am intrigued by this - the actual density of humid/ saturated air will be lower than that of dry air (the effect that keeps clouds up), so the total pressure observed by the pitot will be lower,...
Forum: Tech Log
27th Jun 2010, 12:54
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Also difficult to see how the 2 pitots on same...

Also difficult to see how the 2 pitots on same side would disagree.

@HN39

How would your plot change with alt = FL370 and/or T = ISA+30
Forum: Tech Log
27th Jun 2010, 08:33
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

@ushumgal...

@ushumgal (http://www.pprune.org/members/328214-ushumgal)

In your scenario in which phase does the a/c lose 35,000ft in how long? The bits of the Lockerbie PA103 reportedly took 2 mins to fall...
Forum: Tech Log
25th Jun 2010, 22:37
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Yes, from earlier posts this probably means bank...

Yes, from earlier posts this probably means bank angle greater than 50 degrees or changing rapidly during that gap.

The BEA also reports there must have been messages queued after the final...
Forum: Tech Log
22nd Jun 2010, 08:53
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Note that is not known definitely what altitude...

Note that is not known definitely what altitude AF447 was at. The flight plan was to be at FL370, from

Air France 447 - AFR447 - A detailed meteorological analysis - Satellite and weather data...
Forum: Tech Log
12th Jun 2010, 00:23
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

@UNCTUOUS What is your mechanism for a pitot...

@UNCTUOUS

What is your mechanism for a pitot to slightly under-read?

If the ram-port blocked the the indicated flow will fall to zero if the drain open - guess you are looking for partial...
Forum: Tech Log
7th Jun 2010, 23:10
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

One for the conspiracy theorists:- When the...

One for the conspiracy theorists:-

When the 1st BEA interim report was issued on 2nd July 2009 the English language version was only 72 pages long, it didn't have all the appendices in the French...
Forum: Tech Log
5th Jun 2010, 16:19
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Flight plan was for M 0.82 Fin Rudder limit...

Flight plan was for M 0.82
Fin Rudder limit suggests M 0.80 when A/P disconnected

Does that mean speed was in transition?
Forum: Tech Log
4th Jun 2010, 17:53
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

median of 3 (or bigger odd number) values is...

median of 3 (or bigger odd number) values is generally interpretted as you take the middle one when sorted in order of magnitude, without any averaging. This is sensible as it automatically ignores...
Forum: Tech Log
4th Jun 2010, 15:14
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Ignore me I'm sure Takata is correct re facts re...

Ignore me I'm sure Takata is correct re facts re location/storm - there was much discussion in previous thread and elsewhere about how quickly you can get down in one piece from 35,000ft, clearly not...
Forum: Tech Log
4th Jun 2010, 10:28
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

The weather models suggest AF447 was inside the...

The weather models suggest AF447 was inside the storm system @0210. They had reduced speed from M0.82 to M0.80 at some point. The final ACARS position report which probably reports the position at...
Forum: Tech Log
3rd Jun 2010, 00:03
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

@RetiredF4 It was stated in earlier posts...

@RetiredF4

It was stated in earlier posts that Airbus test pilots have drag chutes to deploy when testing, can't find the reference but

AF 447 – What The Crew Did … Maybe Dark Matter...
Forum: Tech Log
31st May 2010, 23:54
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

which would also be frozen at altitude in the BBC...

which would also be frozen at altitude in the BBC super-cooled liquid storm?

Would still have pitch from gyros?
Forum: Tech Log
30th May 2010, 22:37
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

The Beeb experts seemed to say Speed would have...

The Beeb experts seemed to say Speed would have been reduced from M0.82 to M0.76 and then be only 10knots above stall speed?

They also blamed super-cooled liquid for pitot freezing.

Back on...
Forum: Tech Log
29th May 2010, 14:27
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

It doesn't simulate above 20,000ft or 220knots as...

It doesn't simulate above 20,000ft or 220knots as far as I can tell.

At alts/speeds in its range it doesn't seem to model the small over-read due to the drain blockage, but this is likely to be...
Forum: Tech Log
27th May 2010, 10:02
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

Again see old thread for more detail discussion...

Again see old thread for more detail discussion last year

Not slush at -40 degC, probably micro-fine ice crystals, which would be harder to melt out, could also insulate the TAT probe, and cause...
Forum: Tech Log
26th May 2010, 09:09
Replies: 3,893
Views: 1,543,242
Posted By sensor_validation

It has been discussed before - Pitot tubes have a...

It has been discussed before - Pitot tubes have a drain hole, to allow ingress of liquid to drain, their calibration assumes the leak. If the drain hole blocked they will over-read, not sure what...
Showing results 1 to 35 of 37
 
Page 1 of 2
1
2


 
Forum Jump

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.