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Air France Disaster – Focus On Airbus Air Data Inertial Reference Unit (ADIRU) System
The Australian ^ | June 3, 2009 | LuckyBogey

Posted on 06/03/2009 9:12:38 AM PDT by luckybogey

The Air France disaster should be watched very closely as there are numerous political implications in the aircraft industry. The Australian is reporting investigators may be looking at the Airbus Air Data Inertial Reference Unit (ADIRU) System that sent a Qantas A330 on a wild ride over Western Australia last year.

The Qantas incident last October, and another in December last year also involving an Airbus 330 near Western Australia, involved a problem with a unit called an air data inertial reference unit, which prompted flight control computers to twice pitch down the nose of one of the jets.

Fast action by the crew limited the extent of the plane's fall but 14 people were seriously injured.

The incidents raised questions about a potential wider problem with ADIRUs, which collect raw data on parameters such as air speed, altitude and angle of attack, and process the information before sending it to flight computers. They led to European authorities issuing a global alert to A330 operators.

After the Air France disaster, The Seattle Times reported yesterday that experts were already examining these malfunctions...


(Excerpt) Read more at theaustralian.news.com.au ...


TOPICS: Business/Economy; Foreign Affairs; Government
KEYWORDS: adiru; airbus; airfrance
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To: Jim Noble

I don’t know anymore. The 330 seems to have as impressive a safety record as possible. If you don’t count the test flight accident, you have 3.3 million flights w/out a fatality. We also don’t know the cause of this one yet and whether it will be attributed to the plane. Prior to this you had the 7 test flight fatalities and that’s it over 15 years. I don’t choose to fly Airbus planes for different reasons than safety but will fly them as needed.


21 posted on 06/03/2009 11:23:35 AM PDT by Bogeygolfer
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To: heartwood
At 35,000 feet the pilots would have time to recover from a nose pitch down, wouldn’t they? They can override?

Depends. The weather was bad. And even in good weather there are no guarantees, but read this about some of the luckiest people ever to get off a plane in one piece...

TWA 841, April 12, 1979

22 posted on 06/03/2009 11:59:37 AM PDT by buccaneer81 (Bob Taft has soiled the family name for the next century.)
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To: Jim Noble
Give me Boeing or I ain’t going.

Easier said than done. I live in Columbus, a city of 800,000 and when I go to Boston or NYC it's almost always on an Embraer or a CRJ.

23 posted on 06/03/2009 12:02:06 PM PDT by buccaneer81 (Bob Taft has soiled the family name for the next century.)
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To: Travis McGee

Indeed. As a real fair weather sailor with limited eperience I have only been caught in one bad open water storm and that was in a RHIB in the persian gulf long ago.

Weatheris a killer at all levels. Wonder why the pilots weather radar didn’t warn him ?

Just a look at such would be enough to divert the flight plan to smoother skies or return to Brazil


24 posted on 06/03/2009 12:07:50 PM PDT by Squantos (Be polite. Be professional. But have a plan to kill everyone you meet)
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To: KeyLargo
Thank you for posting and pinging me with this. It is an excellent paper.

Rule #4: Thou shall not fly into thunderstorms. I will not fly within 20 miles of an active building cell. There are old piliots, and there are bold pilots. There are no old, bold pilots.

I am an old chicken pilot.

The suspected flight plan is probably correct because, flying those distances, they probably use canned flight plans. Also SIDs (standard instrument departures) and STARs (Standard Terminal Approach Routes) can get you most of the way on some flghts with just one entry in a proposed flight plan.

At one time there was (might still be) a canned approach (STAR) for LaGuardia that started at a VOR in Illinois. Made it easy for the AA and UAL guys who flew it 10 times a month!

25 posted on 06/03/2009 12:09:59 PM PDT by MindBender26 (The Hellfire Missile is one of the wonderful ways God shows us he loves American Soldiers & Marines)
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To: sionnsar

Different planes, different ADIRUs:

I agree with the point however my understanding is that it is the same software!


26 posted on 06/03/2009 1:23:53 PM PDT by luckybogey
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To: luckybogey

What keeps a fly-by-wire vehicle controlled if there is a sudden disaster in the electrical systems?


27 posted on 06/03/2009 1:26:01 PM PDT by Glenn (Free Venezuela!)
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To: Glenn

gravity, inertia, lift, drag


28 posted on 06/03/2009 1:40:15 PM PDT by stefanbatory (Do you want a President or a King?)
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To: stefanbatory
gravity, inertia, lift, drag

Amazing.

29 posted on 06/03/2009 1:41:47 PM PDT by Glenn (Free Venezuela!)
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To: Jim Noble; Glenn; DuncanWaring
Give me Boeing or I ain’t going.

You mean one of these plastic aircraft with Japanese wings and Italian fuselage ;) ?

What keeps a fly-by-wire vehicle controlled if there is a sudden disaster in the electrical systems?

Aircraft like cars are Faraday cages, so lightning should not cause a disaster (wind shear associated with thunderstorms is much more dangerous). Plus there's redunancy built in. Of course, there's that one in a trillion chance that something unforeseen will happen, but that goes for hydraulic / mechanical controls as well.

On the aircraft I’m most familiar with (primarily business-jets), it’s a regulatory requirement that the pilot be able to physically overpower the autopilot and its associated actuators in the case it runs away and tries to go hard-to-the-stops in any particular direction.

AFAIK overriding the autopilot in an Airbus is as easy as with any other aircraft out there. Overriding the flight envelope protection (like e.g. intentionally stalling the aircraft 50 feet above ground) is a bit trickier.
30 posted on 06/03/2009 1:42:28 PM PDT by wolf78 (Inflation is a form of taxation, too. Cranky Libertarian - equal opportunity offender.)
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To: KeyLargo
That meteorological analysis is one of the most impressive, professional things I've ever read in any field.
31 posted on 06/03/2009 2:08:26 PM PDT by Plutarch
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To: buccaneer81
Here's another very lucky group:

China Air 006

32 posted on 06/03/2009 2:08:42 PM PDT by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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To: buccaneer81

Doesn’t Southwest fly from Columbus to NYC, Providence RI and Manchester NH?


33 posted on 06/03/2009 2:10:46 PM PDT by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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To: DuncanWaring

That would suck. Big time.


34 posted on 06/03/2009 2:12:16 PM PDT by Travis McGee (---www.EnemiesForeignAndDomestic.com---)
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To: luckybogey
I agree with the point however my understanding is that it is the same software!

If one ADIRU comes from Honeywell and the other comes from Litton (or whoever bought them out) you can pretty much bet the eternal salvation of your soul they don't use the same software.

Much patent-infringement and unfair-restraint-of-trade litigation has transpired over the years between those two companies and their respective RLG products.

35 posted on 06/03/2009 2:14:00 PM PDT by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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To: DuncanWaring

Wow. That’s the first time I’ve heard of that one.


36 posted on 06/03/2009 2:14:36 PM PDT by buccaneer81 (Bob Taft has soiled the family name for the next century.)
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To: buccaneer81

WOW! Pucker Factor Infinity on that one!


37 posted on 06/03/2009 2:14:48 PM PDT by Travis McGee (---www.EnemiesForeignAndDomestic.com---)
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To: Squantos
Just a look at such would be enough to divert the flight plan to smoother skies or return to Brazil

I wonder what happens to pilotos who "chicken out" and return to base? Can't be good. (Not as bad as what happened, though.)

38 posted on 06/03/2009 2:16:05 PM PDT by Travis McGee (---www.EnemiesForeignAndDomestic.com---)
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To: DuncanWaring
Doesn’t Southwest fly from Columbus to NYC, Providence RI and Manchester NH?

LaGuardia service starts June 28. To Providence and Manchester, it's four or five hours through Baltimore (then the possible 1-2 hour drive.)

It's business travel. The office prefers US Airways. I don't.

39 posted on 06/03/2009 2:20:06 PM PDT by buccaneer81 (Bob Taft has soiled the family name for the next century.)
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To: Travis McGee

The incident in Post 32 is right up there, too.


40 posted on 06/03/2009 2:20:11 PM PDT by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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