Helicopter crash in Norway today
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No, (you can't see the whole warning panel in this picture). All parameters visible looks to be normal for controlled flight. Lots of fuel.
Can't see the VSI but doesn't 8FLI for 80kts/10° AOB seem like more power than necessary? Nose down attitude suggests the power isn't for a climb (that's how I interpret it).
(I'm alluding to potentially high disc loading and servo transparency with this question)
(I'm alluding to potentially high disc loading and servo transparency with this question)
Join Date: Sep 2003
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Looking at the pic they show, there is significant damage to the couplings. More than I have ever seen. And I have dealt with many sudden stoppage instances over the last 17yrs of component overhaul and repair.
I have alot of questions on what I see here, and find it hard to believe that bolts could have fallen out, although it is possible in a bad case of the swiss cheeze holes lining up.
I believe the engine was ripped from the airframe in this incident and gives pause to some of the damage seen as secondary. The reason I say that is because they show the aft driveshaft coupling torn apart, yet the tail rotor looks intact in the one picture. The liaison tube also bears significant secondary damage consistent with forced removal.
Like I said, there is alot of questions still, especially since the ASB came out to look at these bolts. Are they a cause, or is it secondary damage as well.
I have alot of questions on what I see here, and find it hard to believe that bolts could have fallen out, although it is possible in a bad case of the swiss cheeze holes lining up.
I believe the engine was ripped from the airframe in this incident and gives pause to some of the damage seen as secondary. The reason I say that is because they show the aft driveshaft coupling torn apart, yet the tail rotor looks intact in the one picture. The liaison tube also bears significant secondary damage consistent with forced removal.
Like I said, there is alot of questions still, especially since the ASB came out to look at these bolts. Are they a cause, or is it secondary damage as well.
Years ago under the Aerospatiale logo there was a "similar" rash of incidents/accidents with the 350/355 driveshaft flex couplings. Don't recall the specifics but believe it was the bolt tensile strength or something else that caused the bolt/nut to lose torque leading to bolt failure. The fix was to replace all the bolts with known good bolts marked with baby blue paint on the heads and a repetitive tq-check and bushing check on the disc packs. Unfortunately it doesnt need the bolts to fall out to have a failure which unfortunately again looks similar to the above pics.
this a/c should have the latest mod i think. well beyond the blue head bolts..
there is longer bolts, the 12pt nuts and the higher torque loading now.
if the bolts sheared thats one thing, but if they were loose for so long the nuts came off, or wore thru the bolts enough to disconnect, then theres some serious human factor errors at play from alot of levels
there is longer bolts, the 12pt nuts and the higher torque loading now.
if the bolts sheared thats one thing, but if they were loose for so long the nuts came off, or wore thru the bolts enough to disconnect, then theres some serious human factor errors at play from alot of levels
Final report on the accident is published
The final report on the investigation of the accident near Alta on the 31st of August 2019 from the Norwgian safety investigation authority (NSIA) was published yesterday.
The translated version is here.
"As a result of this investigation the NSIA submits 12 safety recommendations addressed to EASA, CAA-N and Helitrans AS, the helicopter operator. They concern measures to prevent servo transparency, training and safety of commercial sightseeing flights, survival aspects, including crash resistant fuel system and use of helmets, and requirements of lightweight flight recorders."
The translated version is here.
"As a result of this investigation the NSIA submits 12 safety recommendations addressed to EASA, CAA-N and Helitrans AS, the helicopter operator. They concern measures to prevent servo transparency, training and safety of commercial sightseeing flights, survival aspects, including crash resistant fuel system and use of helmets, and requirements of lightweight flight recorders."
An inexperienced pilot running out of talent while trying to give his pax a fun ride.............a waste of 6 lives.
Originally Posted by [email protected]
An inexperienced pilot running out of talent while trying to give his pax a fun ride.............a waste of 6 lives.
