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Search: Posts Made By: techgeek
Showing results 1 to 35 of 37
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Forum: Rumours & News
19th Mar 2014, 02:58
Replies: 11,831
Views: 24,180,845
Posted By techgeek

keeping SATCOM up makes perfect sense

@Ornis
@D.S.

Here is why network links are kept up. Suppose you have a scenario generating LOTS of ACARS messages in succession (e.g. AF447). If each message has to set up and tear down the link...
Forum: Rumours & News
18th Mar 2014, 07:00
Replies: 11,831
Views: 24,180,845
Posted By techgeek

deplorably dismal data

Is anyone else troubled by the lack of accurate empirical data released to date?


Was ACARS log-off received?
Was AMSS log-off message received?
Was ADS logged on and contract established...
Forum: Rumours & News
17th Mar 2014, 06:43
Replies: 11,831
Views: 24,180,845
Posted By techgeek

ACARS and VHF

@Sicer

Reportedly VHF radio disabled by pulling CB. SATCOM uses sep radio and freq for its comm. SATCOM was not disabled.

Result: No VHF comm even if over land. SATCOM only.
Forum: Rumours & News
17th Mar 2014, 04:24
Replies: 11,831
Views: 24,180,845
Posted By techgeek

tomnod

@Shadoku

Looks like a 777 to me ... but taken next day? 09MAR 04:12 - anyone know what TZ the timestamps are on tomnod?
Forum: Rumours & News
17th Mar 2014, 02:58
Replies: 11,831
Views: 24,180,845
Posted By techgeek

WPT CHG

@D.S.

ADS-C can send route data either on a periodic basis or if changed:

Predicted Route Group

Latitude at next waypoint
Longitude at next waypoint
Altitude at next waypoint
ETA at...
Forum: Rumours & News
17th Mar 2014, 01:44
Replies: 11,831
Views: 24,180,845
Posted By techgeek

tomnod lat long

Hmmm tomnod hasn't given up on the S China Sea
Forum: Rumours & News
16th Mar 2014, 19:39
Replies: 11,831
Views: 24,180,845
Posted By techgeek

ACARS tidy shutdown sequence

citation (http://www.ispacg-cra.com/FANS_1_A_Datalink_Comm_V1.0.pdf)
Forum: Rumours & News
16th Mar 2014, 16:44
Replies: 11,831
Views: 24,180,845
Posted By techgeek

@Surtchris

... and the wreckage continued to contact satellites for hours thereafter but was missing when everyone went looking for it so the US Navy decided to go to the Indian Ocean to search for it.
Forum: Rumours & News
16th Mar 2014, 16:35
Replies: 11,831
Views: 24,180,845
Posted By techgeek

ACARS manual shutdown

@Ian_W

Precisely right!



ACARS log-off from the cockpit is a reasonable interpretation that fits two stated facts:

cessation of normal ACARS data
multiple hourly SAT data link...
Forum: Rumours & News
16th Mar 2014, 15:44
Replies: 11,831
Views: 24,180,845
Posted By techgeek

previous pings

@ekpilot

Short answer is yes. I believe this fits the category of information withheld. One can posit a range of reasons for the authorities slowly releasing tidbits they have known for some time....
Forum: Rumours & News
16th Mar 2014, 15:34
Replies: 11,831
Views: 24,180,845
Posted By techgeek

satellite pics of a/c in flight

@uncle_maxwell

That is an interesting proposition. If IR sat photos, taken at night, are available that cover each arc at the time of a given ping it is a reasonable computational exercise to use...
Forum: Rumours & News
15th Mar 2014, 21:58
Replies: 11,831
Views: 24,180,845
Posted By techgeek

KKN

Based on my review of the underlying protocols there are a couple of candidates for "pings". There are requests to establish a comm link between the a/c and ground station via satellite that involve...
Forum: Rumours & News
15th Mar 2014, 21:20
Replies: 11,831
Views: 24,180,845
Posted By techgeek

GCharlie

Thanks for clarifying. If there are more frequent "pings" then a/c location should be more precisely fixed than being publicly stated.

Also, as lakedude pointed out earlier, I think many are...
Forum: Rumours & News
15th Mar 2014, 20:10
Replies: 11,831
Views: 24,180,845
Posted By techgeek

wild_goose

Precisely! I'd like to see a map showing each ping and it's arcs. I suspect the USN has this information.
Forum: Rumours & News
15th Mar 2014, 20:06
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Ramjet555

citation for above quote (http://www.nbcnews.com/storyline/missing-jet/u-s-officials-say-missing-malaysian-jet-pinged-satellites-n53166)

It seems you left this fact out of your theory!

Further...
Forum: Rumours & News
15th Mar 2014, 19:28
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Define ping

Warning - the following is a bit off topic for an aviation forum but it is relevant to this thread.



A reasonable generalization but not really accurate. Protocols use very explicit language to...
Forum: Rumours & News
15th Mar 2014, 18:28
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Sat link and "pings"

It has been reported that last sat contact was 8:11AM MYT (00:11 UTC) and loss of SSR occurred at ~01:21AM MYT (17:21 UTC). That is an elapsed time of just under 7 hours. If there was an hourly data...
Forum: Rumours & News
15th Mar 2014, 17:38
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Define ping

I've researched the underlying comm protocols a bit. Can anyone here clarify whether the "ping" refers to the AMSS R channel protocol transmission from AES to GES?
Forum: Rumours & News
15th Mar 2014, 03:56
Replies: 11,831
Views: 24,180,845
Posted By techgeek

time to fuel exhaustion

Endurance must be less than 7 hours if acft maneuvered as much as now being reported. Especially if most of the flight was at FL230. A much narrower search area should be established based on new...
Forum: Rumours & News
13th Mar 2014, 06:24
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Rolls Royce EHM uses ACARS

From the RR web site:

EHM = Engine Health Monitoring
Forum: Rumours & News
13th Mar 2014, 05:59
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Rolls Royce engine data

This article (http://www.newscientist.com/article/dn25201-malaysian-plane-sent-out-engine-data-before-vanishing.html#.UyFFZ_mzFWg) indicates only 2 data reports were received by RR.



Unless...
Forum: Rumours & News
13th Mar 2014, 05:47
Replies: 11,831
Views: 24,180,845
Posted By techgeek

Rolls Royce engine monitoring system

Here is a link to the RR web page about their engine monitoring system. It does piggyback on ACARS for the comm link.

http://www.rolls-royce.com/about/technology/systems_tech/monitoring_sys...
Forum: Rumours & News
15th Jul 2013, 01:27
Replies: 2,403
Views: 2,195,414
Posted By techgeek

EGPWS

@Etud_lAvia

It appears that we are in agreement!

My idea is an enhanced EGPWS mode (2?) that would address the short landing CFIT scenario exemplified by this accident.
Forum: Rumours & News
14th Jul 2013, 22:06
Replies: 2,403
Views: 2,195,414
Posted By techgeek

GPWS

I just listened to Chairman Hersman's final briefing in which she mentioned they have sent the GPWS to Wash. D.C. for analysis.

Q: Is the GPWS inhibited below some altitude on approach (similar...
Forum: Rumours & News
14th Jul 2013, 00:56
Replies: 2,403
Views: 2,195,414
Posted By techgeek

FQA?

FQA is an acronym for ... ?
Forum: Tech Log
28th May 2011, 17:53
Replies: 2,070
Views: 612,778
Posted By techgeek

deSitter, That's a pretty harsh indictment...

deSitter,

That's a pretty harsh indictment of a lot of good people. People are not 100% perfect at flying planes or designing and writing software. Most pilots and software engineers are very...
Forum: Tech Log
28th May 2011, 17:46
Replies: 2,070
Views: 612,778
Posted By techgeek

There was indication to the pilots of unreliable...

There was indication to the pilots of unreliable airspeed information.
Forum: Tech Log
28th May 2011, 16:44
Replies: 2,070
Views: 612,778
Posted By techgeek

More to it than just pilot control inputs

I am a pilot and a software engineer. Back in April I posted about a scenario that turns out to be quite similar to what the FDR and CVR describe. In that post I suggested that the pilots would have...
Forum: Tech Log
14th Apr 2011, 07:02
Replies: 3,893
Views: 1,536,906
Posted By techgeek

I quote from the 2nd BEA report: "The...

I quote from the 2nd BEA report:

"The reappearance of the flight directors on the PFD when two air speeds will
be calculated that can lead the crew to rapidly engage the autopilot. However, ...
Forum: Tech Log
13th Apr 2011, 06:58
Replies: 3,893
Views: 1,536,906
Posted By techgeek

FBW design goals and aircraft performance

The following quote is taken from a document comparing B777 and A330 flight control design vis a vis aircraft performance limitations and pilot authority developed during the recent USAF tanker...
Forum: Tech Log
13th Apr 2011, 02:19
Replies: 3,893
Views: 1,536,906
Posted By techgeek

On G limits vs CFIT

Gotta love this quote from an ALPA report on system limitations on pilot authority:

"Although aircraft structural integrity may be compromised by a g load in excess of 3.8 gs,
aircraft...
Forum: Tech Log
11th Apr 2011, 04:54
Replies: 3,893
Views: 1,536,906
Posted By techgeek

Spiral dive ...

Spiral dives generally end in a broken airplane due to excessive G loads during recovery (HS or VS failure in flight) unless you get to FL 0 first that is. The graveyard spiral seems ruled out in...
Forum: Tech Log
11th Apr 2011, 01:44
Replies: 3,893
Views: 1,536,906
Posted By techgeek

MLG down before impact or not?

bearfoil's post did not explain why lowering the gear might be an attempt to lower the nose. The idea is that the MLG are located below the center of gravity (CG) of the aircraft and lowering them...
Forum: Tech Log
6th Apr 2011, 04:06
Replies: 3,435
Views: 1,665,837
Posted By techgeek

Why keep searching?

They renewed the search because they were named in a civil lawsuit and are trying to find evidence that will prove they were not negligent in ways that contributed to the accident. I would say some...
Forum: Rumours & News
6th Apr 2011, 04:02
Replies: 196
Views: 80,753
Posted By techgeek

FAA issues new AD

You can read the new AD in response to this incident here (http://bit.ly/hiuUGy). The AD requires eddy current testing to find and confirm cracks in the lower skin at the lap join lower fastener row...
Showing results 1 to 35 of 37
 
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