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Corrosion Found On SAS Q400's  
User currently offlineCPHGuard From Denmark, joined Jun 2006, 278 posts, RR: 0
Posted (7 years 1 month 1 week 6 days 9 hours ago) and read 3845 times:

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/

7 replies: All unread, jump to last
 
User currently offlineDeltaAVL From United States of America, joined Mar 2007, 1893 posts, RR: 6
Reply 1, posted (7 years 1 month 1 week 6 days 8 hours ago) and read 3707 times:

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
User currently offlineSrbmod From , joined Dec 1969, posts, RR:
Reply 2, posted (7 years 1 month 1 week 6 days 8 hours ago) and read 3675 times:

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?


User currently offlineArrow From Canada, joined Jun 2002, 2676 posts, RR: 2
Reply 3, posted (7 years 1 month 1 week 6 days 8 hours ago) and read 3651 times:

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.
User currently offlineKELPkid From United States of America, joined Nov 2005, 6413 posts, RR: 3
Reply 4, posted (7 years 1 month 1 week 6 days 7 hours ago) and read 3567 times:

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 :-)
User currently offlineSomeone83 From Norway, joined Sep 2006, 3427 posts, RR: 3
Reply 5, posted (7 years 1 month 1 week 6 days 2 hours ago) and read 3344 times:

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

User currently offlineTristarSteve From Sweden, joined Nov 2005, 4036 posts, RR: 33
Reply 6, posted (7 years 1 month 1 week 5 days 20 hours ago) and read 3146 times:

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.)


User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6491 posts, RR: 54
Reply 7, posted (7 years 1 month 1 week 5 days 12 hours ago) and read 2704 times:

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, Preben Norholm
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