SARH to go
Ah - is that PISS using Thermally Amplified Kinetic Energy in the Rotor?
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Sven and Crab,
Those are the only limits. As stated you would also be limited by the transmission limits, thereby limiting the level of airframe icing. Maybe severe airframe icing is only caused by SLDs and so that corner is covered. As for forcasting and detection, I would say forecast freezing rain implies SLDs and weather radar could be used to avoid likely areas.
Those are the only limits. As stated you would also be limited by the transmission limits, thereby limiting the level of airframe icing. Maybe severe airframe icing is only caused by SLDs and so that corner is covered. As for forcasting and detection, I would say forecast freezing rain implies SLDs and weather radar could be used to avoid likely areas.
I agree but you can still encounter SLDs without any forecast of freezing rain including in stratiform cloud where your weather radar is unlikely to see them. It still seems odd that they issue a limit regarding SLDs without either defining what size they are talking about or giving you a measuring method.
SLDs will cause severe airframe icing since only 1/80th of the drop (per degree below 0) will freeze on contact and the rest will flow over the airframe freezing into clear ice as it does so.
SLDs will cause severe airframe icing since only 1/80th of the drop (per degree below 0) will freeze on contact and the rest will flow over the airframe freezing into clear ice as it does so.
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RIPS continued..............
A practical example of the advantage of RIPS............
Last night, S-92 from Stornoway picked up casualty on the west coast of Scotland and transferred said casualty to Inverness. Conditions en-route required an IFR transit above safety altitude in icing conditions. The aircraft spent a total of about an hour and a half in cloud and precipitation at about -2 deg, 135kts airspeed with no ill effects. The RIPS ice accretion meter indicated light to moderate icing throughout. Embedded CB's were avoided by use of the very helpful forward facing radar.
Had this been an S-61 the casualty would have had to go the long way round, low level via the north coast at 110 kts.
A similar trip was done earlier in the week, this time to collect a casualty from Elgin and transport to Aberdeen. I would love to say the job was given to Stornoway because of superior capabilities and in a sense it was - Lossiemouth were off state. Again.
The icing clearance of the S-92 is not perfect but it's a massive step forward.
Last night, S-92 from Stornoway picked up casualty on the west coast of Scotland and transferred said casualty to Inverness. Conditions en-route required an IFR transit above safety altitude in icing conditions. The aircraft spent a total of about an hour and a half in cloud and precipitation at about -2 deg, 135kts airspeed with no ill effects. The RIPS ice accretion meter indicated light to moderate icing throughout. Embedded CB's were avoided by use of the very helpful forward facing radar.
Had this been an S-61 the casualty would have had to go the long way round, low level via the north coast at 110 kts.
A similar trip was done earlier in the week, this time to collect a casualty from Elgin and transport to Aberdeen. I would love to say the job was given to Stornoway because of superior capabilities and in a sense it was - Lossiemouth were off state. Again.
The icing clearance of the S-92 is not perfect but it's a massive step forward.
As it should be - it is a 21st century helicopter after all.
So you used the weather radar for the purpose it was designed then
Depending on the density altitude at the cruising level a Sea King may still have been able to do the job but certainly not at 135 kts!
Seriously though it is good to see that the much-vaunted superior capabilities of the S-92 are being used to save lives and I know that Lossie wish they had your serviceability.
So you used the weather radar for the purpose it was designed then
Depending on the density altitude at the cruising level a Sea King may still have been able to do the job but certainly not at 135 kts!
Seriously though it is good to see that the much-vaunted superior capabilities of the S-92 are being used to save lives and I know that Lossie wish they had your serviceability.
You know.. Christmas spirit and all that....
Join Date: Mar 2002
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Icing Papers
Cougar http://www.sae.org/events/icing/pres...16jamieson.pdf
Sikorsky http://www.sae.org/events/icing/pres...16flemming.pdf
And seasons greeetings!
Sikorsky http://www.sae.org/events/icing/pres...16flemming.pdf
And seasons greeetings!
Join Date: Apr 2006
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SLD limitation
Just to return to the SLD restrictions on the S-92A. The S-92A is certified to the fullest extent of Appendix C in 14 CFR Part 29, taking the allowable 10,000 ft limitation for expediency - the system was clearly designed to be independant of altitude.
Appendix C does not cover SLD - in fact the FAA is hardover in their concern that ANY helicopter not be operated in that environment. The restriction in the RFM is to assuage their concerns about SLD - Roselawn was a very hard lesson for the FAA and the S-92A walked straight into the backlash.
The S-92A is certainly no more susceptible to SLD than ANY helicopter out there.
Appendix C does not cover SLD - in fact the FAA is hardover in their concern that ANY helicopter not be operated in that environment. The restriction in the RFM is to assuage their concerns about SLD - Roselawn was a very hard lesson for the FAA and the S-92A walked straight into the backlash.
The S-92A is certainly no more susceptible to SLD than ANY helicopter out there.
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Military only?
Heard a couple of days ago that the MCA will not be using the helos of the CG for any transits for offshore firefighting crews. I suppose that leaves the military to pick up and deliver for the time being. I hope sense prevails and a bigger a/c will eventually be supplied to Solent and Portland, because one day, it will be needed. Happy New Year to you all, thorpey.
So no MIRG cover for the Channel then - this interim contract is going well isn't it
And before LostatSea starts - it's probably the Military's fault
And before LostatSea starts - it's probably the Military's fault
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Overheard!
'Well, we could use an RAF Chinook they're the right size for that agency requirement,'
'Running a little tight on availaility aren't they?'
'Really?'
'er yes'
Well those special people the americans have some big rescue helicopters don't they!'
'The PAVELOW's?'
'Is that a CHS3 (sic)'
'Er yes.' (slowly dying)...they're all retired'
'Whens that!!?'
'It's done!'
'Oh *&$%!'
'What about the small ones that did the long range rescue the other month!?'
'The pavehawk?'
'Bit small perhaps - good range'
'Well we'll just have to get a bigger helicopter then, -we could put a probe thing on it like the americans have'
The explosive crash of glass as I threw myself from a fifth floor window was just in my mind! Shame the above ear wig - give or take - wasn't!
'Running a little tight on availaility aren't they?'
'Really?'
'er yes'
Well those special people the americans have some big rescue helicopters don't they!'
'The PAVELOW's?'
'Is that a CHS3 (sic)'
'Er yes.' (slowly dying)...they're all retired'
'Whens that!!?'
'It's done!'
'Oh *&$%!'
'What about the small ones that did the long range rescue the other month!?'
'The pavehawk?'
'Bit small perhaps - good range'
'Well we'll just have to get a bigger helicopter then, -we could put a probe thing on it like the americans have'
The explosive crash of glass as I threw myself from a fifth floor window was just in my mind! Shame the above ear wig - give or take - wasn't!
So no MIRG cover for the Channel then
The 'plan'
, now that would be a novelty, evidently, is for the super swift 139, whichever is nearest, and available, to take out two firefighters, at warp factor 12, to assess the situation. Then the military, if available, would plod along with the rest of the MIRG team to what would probably by then be a smouldering wreck.
Do we like this 'plan'?? 
What do you think??I am not having a go at the military, they have been dropped in it just the same as we have by the unseen bean counters!!!
3D
Tonka.
Sounds like normal Government thinking to me!!
Finger on the pulse and all that!!3D