View Full Version : AAIB Oct 2016
John R81
13th Oct 2016, 15:54
Bell 206B Jet Ranger II, G-OAMI. (https://assets.publishing.service.gov.uk/media/57d6bb0540f0b6533a00003e/Bell_206B_Jet_Ranger_II__G-OAMI_10-16.pdf)
Having departed Wycombe Air Park and in level flight, the helicopter suffered a rapid and uncommanded loss of altitude. The pilot, believing that there had been a loss of engine power, carried out an autorotation. The helicopter touched down with a high rate of descent which resulted in the failure of the tail boom and landing gear.
Data recorded by on-board systems showed that the engine operated normally throughout the event. A limited examination of the helicopter was unable to identify a defect within the engine or flying controls which might have caused the uncommanded loss of altitude.
RINKER
13th Oct 2016, 17:51
Sprag clutch ?
FSXPilot
13th Oct 2016, 17:51
Wetware failure?
Turbulence?? Not having your hand on the collective???
SASless
13th Oct 2016, 20:19
From the wealth of information in that.....no telling what happened.
the helicopter suffered a rapid and uncommanded loss of altitude
What was the Rotor RPM....N-1, N-2, Torque???
krypton_john
13th Oct 2016, 22:34
since when do 206BII or any other 206 variant have on-board data collection?
tu154
14th Oct 2016, 07:22
Some aircraft have it fitted as part of a contractual requirement if the aircraft is used for pipeline inspection for example.
krypton_john
14th Oct 2016, 08:23
That's interesting - but I can't find anything available for B206 other than the Honeywell Intellistart for C30P types - nothing for C20.
Does anyone have any links?
212man
14th Oct 2016, 09:01
That's interesting - but I can't find anything available for B206 other than the Honeywell Intellistart for C30P types - nothing for C20.
Does anyone have any links?
Well, this one is the first hit with Google.........
http://www.shadin.com/about/press-releases/54-shadin-avionics-announces-easa-stc-approval-for-bell-206-407-fuel-management
jeepys
14th Oct 2016, 19:05
On board systems could simply be interpreted as go pro perhaps.
Whilst it's not an approved aircraft fit piece of equipment it can provide a picture that can paint a thousand words as well as giving a soundtrack.
another reason in favour of simplex
if a pilot can get confused to the point of crashing a perfectly serviceable machine just imagine how confused he might be if it were more complex? (as we see from time to time)
(another reason for singles, eg Kenya)
fisbangwollop
14th Oct 2016, 20:04
The lady that used to fly that helicopter on pipeline inspections over Scotland had a lovely voice.......just saying ��
jeepys
14th Oct 2016, 21:35
another reason in favour of simplex
Not really a valid comment if 'duplex' crews are trained properly and have good continuation training, probably unlike the Kenya crews.
krypton_john
14th Oct 2016, 22:44
Hi 212Man - that's a fuel flow transducer and fuel management computer not a HUMS monitoring and recording system.
It does state that their fuel monitor does support their ETM though:
ETM - Helicopter (http://www.shadin.com/products/engine-trend-monitors/helicopter)
And the ETM claims Allison 250 support!
However doesn't mention any STCs?
212man
15th Oct 2016, 08:23
Hi 212Man - that's a fuel flow transducer and fuel management computer not a HUMS monitoring and recording system.
It does state that their fuel monitor does support their ETM though:
ETM - Helicopter (http://www.shadin.com/products/engine-trend-monitors/helicopter)
And the ETM claims Allison 250 support!
However doesn't mention any STCs?
Nobody has mentioned HUMS and I wasn't suggesting this was one. But, as you have said, if an ETM system is installed (and I should have posted that link, not the first) it will allow engine data to be downloaded which will clearly indicate whether it was operating normally during the period of the incident. I'm not saying this particular system was fitted, just showing an example of after market kit that is out there and which would fit the comments by the AAIB about data.