Kids!
The names of the PAX with pictures was just released on NRK.no.
5 great kids at the age of 19 to 22. Going for a joy ride at a festival. Gone...... The State Attorney is getting all emotional and is loosing his cool and want the company, Heli Trans investigated ASAP. The pilot is not named but described as a 27 man fairly new to the company. Sad! Cpt B |
Gray posted in part: “The manufacturer does not consider servo transparency a failure of the system, but a limitation of all single hydraulic systems” Thanks for the AH statement, but I’m missing something. If the single servo system was designed to provide a control force which exceeds the maximum forces that can be generated by the rotor, this discussion, and the similar one for the Gazelle, would be moot, n’est-ce pas? |
Originally Posted by JohnDixson
(Post 10560347)
Gray posted in part: “The manufacturer does not consider servo transparency a failure of the system, but a limitation of all single hydraulic systems” Thanks for the AH statement, but I’m missing something. If the single servo system was designed to provide a control force which exceeds the maximum forces that can be generated by the rotor, this discussion, and the similar one for the Gazelle, would be moot, n’est-ce pas? Servo transparency Not saying that this is the safest way, only that is why the hyd-syst is limited in power. I’d rather see it constructed as You say, but then the rotor system might need to be redesigned to cope with the forces. |
Originally Posted by BluSdUp
(Post 10560336)
The names of the PAX with pictures was just released on NRK.no.
5 great kids at the age of 19 to 22. Going for a joy ride at a festival. Gone...... The State Attorney is getting all emotional and is loosing his cool and want the company, Heli Trans investigated ASAP. The pilot is not named but described as a 27 man fairly new to the company. Sad! Cpt B |
The limits of the hydraulic system is set to not overload the strenght of the rotor system to protect it from damage if the helo is operated outside the envelope. Servo transparency Perish the thought we under designed our flight control system and and then cause the aircraft to crash killing the occupants because we did not wish to over stress a rotor blade or some sheet metal and rivets. Why is it all the other helicopter designers seem to see the exact opposite way? |
Thanks AAKEE and as I think you would concur with SAS’ comments, allow a follow up to his observation: If one designs as I suggested ( BTW-this is the approach at SA just a disclaimer, so to speak ), then, when the pilot operates the controls such that the control loads become excessive ( the aggravating factor being stall or stall flutter ) the pilot is faced with very much higher vibration levels, and if for instance performed in turning flight, what was intended as a level turn maneuver may involve some rate of descent as the rotor lift I’d decreased by the stall, but those excessive control loads are within the design fatigue and static strength design parameters, and the controls don’t break-the pilot remains in control. As I wrote previously, I’m still a bit mystified as to the AH design philosophy. They are most certainly not amateurs and that is the reason for my curiosity. |
Originally Posted by JohnDixson
(Post 10560347)
Gray posted in part: “The manufacturer does not consider servo transparency a failure of the system, but a limitation of all single hydraulic systems” Thanks for the AH statement, but I’m missing something. If the single servo system was designed to provide a control force which exceeds the maximum forces that can be generated by the rotor, this discussion, and the similar one for the Gazelle, would be moot, n’est-ce pas? |
Some extra information in this article that hasn't been posted in this thread, and it's in english.
https://www.thelocal.se/20190901/swe...licopter-crash |
As usual in crashes of this type of helicopter....AS 350....we see immediate discussion of hydraulics issues...belts, pulleys, jack stall and fire post crash that evokes questions about crashworthiness of the fuel system.
We also hear talk of the. weakness of the airframe during high impact with the ground. The aircraft is popular....and has good performance numbers. Does the good really outweigh the bad in this machine or is its success profit driven? Did the certifying authorities allow a problem machine to fly when perhaps they should not. have? It is not like EC/AB helicopters have not made some engineering mistakes in their past. Will we see the accident investigation of this tragedy record some similar finding from previous crashes that point to design issues? |
Originally Posted by JohnDixson
(Post 10560470)
Thanks AAKEE and as I think you would concur with SAS’ comments, I’m not qualified on the type. I think the jack stall problem is quite easy to avoid, theoretically. If you have respect for it and fly it like AS/EC/AH built it, i think its safe in that perspective. But I also think that the reason people get in this kind of trouble will continue to happen making it dangerous to those that dont stay inside the box(envelope). AH can tell us it is safe inside the approved envelope but there will always be people that fly outside it. (Not saying this accident was due to this). |
The British military used the AS 350BB with a single hydraulic system as a basic trainer for 20 years flying tactical and low level profiles at high speed and managed not to experience jackstall/servo transparency in thousands of flying hours.
As I said before you have to be ham-fisted to get it to do that - stunting and bunting at high AUM with limited experience is a pretty good recipe though. |
FDR
NRK.no reports that some sort of data recorder has been recovered , but in bad shape.
This is not a proper FDR , so what is it exactly. Anyone care to enlighten me? Regards Cpt B |
Originally Posted by BluSdUp
(Post 10561139)
NRK.no reports that some sort of data recorder has been recovered , but in bad shape.
This is not a proper FDR , so what is it exactly. Anyone care to enlighten me? Regards Cpt B |
FinalCheck
Thanks
Handy little thing. And its Black, ie a black Box. In this case I fear it is burnt to a crisp, but time will show. According to the Investigation Team they have little to go by as most of the main body was consumed by the fire. At NRK.no there is some emotional RT , as a Heli Team 212(?) happens to pass by makes a Mayday call which is relayed by WF Dash 8. He eventually manage to set down to rescue a person outside the wreak , unfortunately this person later passed away. The SAR Seaking was there quickly as well. Some quick response by fellow RotorHeads, but to no avail. So. If this was a Technical problem: Fix it! If this was a Operational problem : Fix it! We owe those dead Kids. Eh!? Respectfully Cpt B |
BluSdUp
Have a look at this accident report, not much left over of aircraft after a post crash fire but they still got a lot of good data from the Vision 1000 unit: https://www.ntsb.gov/investigations/...ts/AAR1403.pdf Not saying the accident investigators will this time but they might, of course FDR / CVR like in the bigger aircraft would be ideal but cost prohibitive, this a a great solution for the smaller helicopters. |
FinalChecks
Indeed not much left of that frame either, but the unit looks to have avoided the fire. Lets hope it can be recovered in this case as well. A small " Crash " box and it would stand a better chance. Anyway Thanks |
Originally Posted by DonQuixote23
(Post 10559057)
Could we perhaps be a little more respectful, hours after the accident? Horrible. RIP |
Norwegian media are reporting that Airbus Helicopters are mandating inspections of the connection between the engine and gearbox of certain new AS350, AS550 and EC130 models. |
Originally Posted by [email protected]
(Post 10561114)
The British military used the AS 350BB with a single hydraulic system as a basic trainer for 20 years flying tactical and low level profiles at high speed and managed not to experience jackstall/servo transparency in thousands of flying hours.
As I said before you have to be ham-fisted to get it to do that - stunting and bunting at high AUM with limited experience is a pretty good recipe though. |
its ASB 63.00.32
its pertaining to the driveshaft flange bolts, both engine side and MGB side for proper installation. Its not specific if its this B3e incident, other than it says a recent accident with an ongoing investigation. |
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This is a ørintscreen of a video tanken 1.30 mins before the actual crash. Are there any errors showing up in the panel? Ibb.co/hLcnJqJ
|
Originally Posted by Jon Martinsen
(Post 10567829)
This is a ørintscreen of a video tanken 1.30 mins before the actual crash. Are there any errors showing up in the panel? Ibb.co/hLcnJqJ
|
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) |
|
Originally Posted by M609
(Post 10569311)
|
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. |
Originally Posted by GrayHorizonsHeli
(Post 10569442)
Looking at the pic they show, there is significant damage to the couplings.... find it hard to believe that bolts could have fallen out...
|
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 |
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." |
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]
(Post 11203983)
An inexperienced pilot running out of talent while trying to give his pax a fun ride.............a waste of 6 lives.
|
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