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Qantas A330 Emergency Landing in Learmonth

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Qantas A330 Emergency Landing in Learmonth

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Old 7th Mar 2009, 11:57
  #341 (permalink)  
Wod
 
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I'll stick with the ATSB for now.
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Old 7th Mar 2009, 12:08
  #342 (permalink)  
 
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I understand military jets such as E6B prowlers and the like have some fairly sophisticated and powerful jamming gear installed (relatively speaking)..... not sure what effect it would have on a commercial jet..... however this is relatively small and when compared to ground based gear somewhat insignificant.

Is it really beyond the realms of possibility that ground based gear appropriately targeted couldnt do this? (Yes pretty remote - but is it possible?)



Anyone with any idea of how military jamming on a jet works?
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Old 7th Mar 2009, 15:10
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mmm

Something i dont understand is that pax get told to switch off ipods etc on takeoff and landing as they can interfere with aircraft navigation equipment.

So if an Ipod supposedly can do this to an aircraft, im supposed to believe that Harold E Holt communications cannot?
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Old 7th Mar 2009, 22:55
  #344 (permalink)  
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Lightbulb

When any airliner takes off, I'd put money on the fact there are still mobile phones, ipods, blackberrys or other 'devices' switched on. Given how few events we have because of those devices and their proximity to the aircraft I find it doubtful that a VLF transmission caused this type of event.
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Old 8th Mar 2009, 00:07
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Keg - only thing is - all those items are extremely low powered (by comparison) and the jets wiring should be moderately well shielded from general interference items such as those.

I know many crews who leave their phones on all the time - the only downside is your phone looks for a station all the time and the battery goes flat quickly.

In fact sit in business class and its amazing how many phones start getting msgs (some punters dont care as their phones beep continuously) at about 1000' on finals.

Also I find it hard to believe any phone or ipod like item will ever cause interference. (Not saying it wont just very unlikely and likely to be some mitigating factor)

Yet a military base may have the ability to.... does this base only transmit VLF? Or is it capable of other transmissions which may cause interference?
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Old 8th Mar 2009, 00:30
  #346 (permalink)  
 
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ipods mobile phones and the like emit much higher wavelength emissions from either their antenna or simply from oscillators within the gizmos.They do so within very close range of everything within that hull.
VLF has (as discussed at great length earlier) an enormous wavelength, ie kilometres, and despite its power output is still hundreds of K's away.To have an efficient antenna and to allow a signal at those wavelengths within a shielded hull to do anything is remote to the extreme imho.

I also tend to think that the turning off of consumer electronics is probably overplayed but why take the risk ?

I'm sure the very clever people who design these things do consider the RF the aircraft will encounter and provide adequate filtering and shielding.

If the vlf signal has anything to do with it, it would be a failure of a filtering cct and or shielding within wiring to or in a component not a design oversight imho.

Not having a shot at anyone here but in the media (including the net)those who dont or wont understand tend to go with conspiracy theories to explain things.

I'm quite sure any military would like their airbuses ie tankers) to not fall from the sky anytime they go within cooee of a vlf station.Its in their interests to solve this issue not hide from it.
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Old 9th Mar 2009, 13:22
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This post's two links have a lot to offer by way of precedent and explanation for ADIRU misbehavior
.

LINK
.
.
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Old 20th Sep 2010, 21:02
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and now a word from the lawyers....

Qantas passengers to sue Airbus over plunge terror

Qantas passengers to sue Airbus over plunge terror
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Old 13th May 2017, 23:41
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A view from the inside. It is not a good situation when faced with an aircraft gone "rogue"

The untold story of QF72: What happens when 'psycho' automation leaves pilots powerless?
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Old 14th May 2017, 03:50
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Originally Posted by Lookleft
A view from the inside. It is not a good situation when faced with an aircraft gone "rogue"

The untold story of QF72: What happens when 'psycho' automation leaves pilots powerless?
Was told about this article on one of the online Fairfax group (WAToday), but couldn't get far into it ... the writing makes GT look like a Pulitzer winner!
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Old 14th May 2017, 06:14
  #351 (permalink)  
 
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10 simultaneous failures at the same moment
and together too.
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Old 14th May 2017, 06:41
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Really? I found the story quite good myself. Glad it was them up there and not me.

Well handled by the crew I thought

You need to get a life
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Old 14th May 2017, 07:45
  #353 (permalink)  
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The reason you have three computers is that is one gives erroneous information the other two can overrule, or so I thought. Obviously airbus engineers think differently.
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Old 14th May 2017, 07:55
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What happens if two are in error? I am of the understanding that the manufacturer (Northrop-Grumman) admitted that 5 defective ADIRU's came off the production line in sequence, 3 ended up in QF aircraft, with2 defective units ending up in the aircraft involved in the incident (QPA).
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Old 14th May 2017, 09:02
  #355 (permalink)  
 
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A good read. Reminded me of the SQ A340 that went berserk near ASP many years ago.
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Old 14th May 2017, 12:37
  #356 (permalink)  
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Originally Posted by B772
A good read. Reminded me of the SQ A340 that went berserk near ASP many years ago.
Except that was self inflicted when they turned off the hydraulic pumps instead of some fuel pumps to balance fuel!
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Old 14th May 2017, 14:25
  #357 (permalink)  
 
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When I checked out on a 707 many moons ago the Check pilot said :

All the lights come on and all the warning noises sound; What do you do ?

Answer: Sit on your f******* hands.

The idea being to see what the aircraft is doing and is it on profile before you jump in.

Best advice I ever got !
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Old 14th May 2017, 16:58
  #358 (permalink)  
 
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Originally Posted by 4Greens
When I checked out on a 707 many moons ago the Check pilot said :

All the lights come on and all the warning noises sound; What do you do ?

Answer: Sit on your f******* hands.

The idea being to see what the aircraft is doing and is it on profile before you jump in.

Best advice I ever got !
That's 'cos it's a Boeing!
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Old 14th May 2017, 23:28
  #359 (permalink)  
 
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All good but it would be hard to sit on your hands when you are watching the nose pitch down suddenly...........
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Old 14th May 2017, 23:49
  #360 (permalink)  
 
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That's 'cos it's a Boeing!
It happened to a Boeing first, and they had a Honeywell ADIRU. It was a very similar incident where the computers were malfunctioning and the only warning to the crew was the autopilot reacting to bad data. The crew of that aircraft also lost confidence in their machine. It gave them a false windshear warning on final approach for good measure. That was a 777.

The QF Captain's nickname according to the article is "Sully"!
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