UK SAR 2013 privatisation: the new thread
GPS Hovering
Al-B,
Not sure but did I not read somewhere that the GPS was used for the hover. It would be better than the doppler, which on the BHL S61s, used to see the winchman and chunner off in what ever direction it felt like.
It was proposed that GPS was used years back but kicked into the long grass due to the fear of jitter having the same effect.
Talking of jitter has anybody ever seen or had the GPS run away due to jitter? Can't say I have but maybe I'm lucky or my attention wandered.
Not sure but did I not read somewhere that the GPS was used for the hover. It would be better than the doppler, which on the BHL S61s, used to see the winchman and chunner off in what ever direction it felt like.
It was proposed that GPS was used years back but kicked into the long grass due to the fear of jitter having the same effect.
Talking of jitter has anybody ever seen or had the GPS run away due to jitter? Can't say I have but maybe I'm lucky or my attention wandered.
Last edited by Sevarg; 18th Jan 2015 at 20:51. Reason: typo
.......and since whatever it is you are trying to rescue from the sea is almost certainly moving due to tide, wind, surface current, downdraught or it's own motive power I guess that GPS won't help too much over the water either!
Only ever got the Jitters pre AOC's inspection - marching never a strong point!
Only ever got the Jitters pre AOC's inspection - marching never a strong point!
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I previously described Position Hold, where the aircraft is held over a precise lat long. The more commonly used alternative is Velocity Hold where the pilot making the selection can set a datum baded on the currents/drifts you refer to. This has proven to be useful in the past, especially where extremely high hovers have been required to try and mitigate against the S92's very powerful downwash.
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Don't upset the winchman.
It would be better than the doppler, which on the BHL S61s, used to see the winchman and chunner off in what ever direction it felt like.
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SAR RC
The GPS can be used to maintain a precision hover over a point in space - but only over water, not over land.
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Sorry, I'll rephrase what I wrote. Position Hold and Velocity Hold on the S92 tend to only be used over the water where there is an absence of close external references.
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It's AHRS (Altitude Heading Reference System), which uses gyros, accelerometers and magnetic sensor units, that enables the S92A to accurately hold position in the hover.
AHRS will reference GPS for it's position, GPS does not ensure an accurate hover but merely advises the aircraft it is where it thinks it is.
AHRS allows the aircraft to hold a position (PHLD) or fly lateral and longitudinal references (VHLD) to maintain position with a vessel or other drifting target.
AHRS is also responsible for enabling the SAR AFCS modes for transition down functions.
Not just shiny and faster.
AHRS will reference GPS for it's position, GPS does not ensure an accurate hover but merely advises the aircraft it is where it thinks it is.
AHRS allows the aircraft to hold a position (PHLD) or fly lateral and longitudinal references (VHLD) to maintain position with a vessel or other drifting target.
AHRS is also responsible for enabling the SAR AFCS modes for transition down functions.
Not just shiny and faster.
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HM Coastguard's National Maritime Operations Centre (NMOC) provides the function of the UK Aeronautical Rescue Coordination Centre (ARCC) as required by international treaty obligations and UK national requirements. Search and Rescue (SAR) coordination of all aviation incidents and the tasking, deployment and coordination of UK aviation SAR assets within the air, land and sea areas of the UK Search and Rescue Region (UK SRR) is the primary purpose of this function.
The Senior Aeronautical Operations Officer SAOO is responsible to the duty Maritime Operations Commander, via the duty Aeronautical Operations Controller (AOC) for the efficient coordination of aviation SAR incidents, and the efficient and effective tasking, deployment and coordination of UK SAR aviation assets, within the land and sea areas of the UK SRR.
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What the hell will they be paying the Junior Aeronautical Operations Officers?
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Check out "... responsible for the performance and effectiveness of the Aeronautical Operations Specialist (AOS) and Aeronautical Operations Officers (AOO) under their supervision ... "
This is clearly not going to have Flight Lieutenants on PA Scales rushing to PVR!
No sign of ads for Aeronautical Operations Specialist.
AHRS allows the aircraft to hold a position (PHLD) or fly lateral and longitudinal references (VHLD) to maintain position with a vessel or other drifting target.
And I think the A in AHRS stands for attitude not altitude
I'm with Al Bert. Pilots used to do the hovering in my day. Automation is great, up to the point of failure. What ever the advances in Gizzmos and stated failure probabilities. A SAR crew must be fully proficient in all modes including the pure human element as well.
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I remember my days of the Whirlwind when everything was done manually. No autopilot, auto hover - just pilot and winchop skill and then when I flew the Wessex, wow 2 engines and an autostab - woohoo
All the super-automation is fine in some situations but even the VHLD (if that is what it is called) will only cope with steady state scenarios - an object in the water in any meaningful sea state will not move in a predictable and steady fashion - it will require pilot (or AHT) input to keep up. The automation is an aid but most winching jobs will still need stick and poles skills from the pilot.
The Sea King 3A has an auto-hover capability up to 200' and a HT you can trim (either on the cyclic or the HT controller) to give a relative hover and it has a very flexible TD SAR mode.
So actually the S92 is just newer and shinier
The Sea King 3A has an auto-hover capability up to 200' and a HT you can trim (either on the cyclic or the HT controller) to give a relative hover and it has a very flexible TD SAR mode.
So actually the S92 is just newer and shinier
I'm with Al Bert. Pilots used to do the hovering in my day. Automation is great, up to the point of failure. What ever the advances in Gizzmos and stated failure probabilities. A SAR crew must be fully proficient in all modes including the pure human element as well.