CPHGuard
Topic Author
Posts: 249
Joined: Fri Jun 09, 2006 8:58 pm

Corrosion Found On SAS Q400's

Wed Sep 19, 2007 6:05 am

According to danish newspaper BT, SAS confirms that they have found corrosion on several of their Q400's

The corrosion has been found in the bolts, that is beleived to have caused both the AAL and the VNO accident.

The same article states that the Lithauanian investigation board has confirmed it was a similar malfunction that caused both the AAL and the VNO accident.

Link in danish only:
http://www.bt.dk/article/20070918/nyheder/709180388/
 
DeltaAVL
Posts: 1525
Joined: Wed Mar 21, 2007 10:15 pm

RE: Corrosion Found On SAS Q400's

Wed Sep 19, 2007 7:31 am

So who's fault it is? Is it SAS's for not provided good enough maintenance? Or is it Bombardier's fault, for its design oversight?
"We break, We bend, With hand in hand, When hope is gone, Just hang on." -Guster
 
srbmod
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Joined: Tue Mar 20, 2001 1:32 pm

RE: Corrosion Found On SAS Q400's

Wed Sep 19, 2007 7:42 am

Quoting DeltaAVL (Reply 1):
Is it SAS's for not provided good enough maintenance? Or is it Bombardier's fault, for its design oversight?

They'll probably point fingers at each other in that regards.

This could end up being something along the lines of the aftermath of AS 261, where both the airline and the a/c manufacturer were named in the contributing factors that caused the incident.

And could this be just a Q400-specific issue or do all of the Dash 8 a/c ever built need to be looked at?
 
Arrow
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Joined: Wed Jun 19, 2002 7:44 am

RE: Corrosion Found On SAS Q400's

Wed Sep 19, 2007 7:52 am

Quoting DeltaAVL (Reply 1):
And could this be just a Q400-specific issue or do all of the Dash 8 a/c ever built need to be looked at?

I'm betting it's Q400 specific. The DHC-8 100/200/300 fleet has been around for a very long time, and if corrosion was a factor it would have turned up a long time ago. Last example of a corrosion-related problem on a DHC model was in the flaps of the Twin Otter. A Twotter float plane went in the water in (I think) Vancouver when flaps were set at maximum and a pin on one side failed, dropping it into the water pretty hard after a partial retraction. There were some fatalities. Out of that came increased inspections on all water-based twotters, especially the salt-water based ones -- and a change in operating procedures -- no more full-flap landings on floats.
Never let the facts get in the way of a good story.
 
KELPkid
Posts: 5247
Joined: Wed Nov 02, 2005 5:33 am

RE: Corrosion Found On SAS Q400's

Wed Sep 19, 2007 8:46 am

Quoting CPHGuard (Thread starter):
The corrosion has been found in the bolts, that is beleived to have caused both the AAL and the VNO accident.

At least that's an easy fix-you can always change out bolts for ones with better corrosion protection  Wink
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
 
Someone83
Posts: 2934
Joined: Sun Sep 17, 2006 5:47 pm

RE: Corrosion Found On SAS Q400's

Wed Sep 19, 2007 1:57 pm

Wideroe (WF) has discovered the same on one of their Q400 also and it's on one of their "own" and not the one they acquired from SAS
 
Tristarsteve
Posts: 3362
Joined: Tue Nov 22, 2005 11:04 pm

RE: Corrosion Found On SAS Q400's

Wed Sep 19, 2007 7:11 pm

Quoting DeltaAVL (Reply 1):
So who's fault it is? Is it SAS's for not provided good enough maintenance? Or is it Bombardier's fault, for its design oversight?

Bombardier will have supplied a maintenance schedule to SAS, which SAS used to write the schedule which was approved by the Danish authorities. If Bombardier had not requested inspection of this bolt (which seems to be inside an actuator) then I don't see how SAS can be faulted. With these aircraft only having about 10000 flights, it is unlikely that these actuators would have been scheduled off for an overhaul (If they have a hard life. They may be on-condition.)
 
prebennorholm
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Joined: Tue Mar 21, 2000 6:25 am

RE: Corrosion Found On SAS Q400's

Thu Sep 20, 2007 3:25 am

Tomorrow (Thursday) the Scandinavian aviation authorities will again decide whether the grounding will be lifted.

Anyway, even if they allow Q400 flights again, then it seems like SAS has cancelled all Q400 ops until at least Tuesday next week.

They have an unknown number of planes which in any case need repair and new spares before they can fly again. Planes which didn't pass the special landing gear inspection as dictated by Bombardier.

If they fly on Tuesday, then that means a total of 783 cancelled flights while 8 other airlines have helped SAS by performing 331 SAS Danmark flights. Those airlines are SAS Norway, Spanair, Cimber Air, Sterling Airlines, Jet Time, Atlantic Airways, DAT (Danish Air Transport) and MyTravel.

Especially Cimber Air is busy doing roughly half of those 331 flights with their quite small ATR and CRJ fleet.

The situation is much the same in Sweden.

SAS Norway is less severely hit, but that's mainly because all Q400 flights between Denmark and Norway are operated by SAS Danmark.
Always keep your number of landings equal to your number of take-offs