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"Chris OCallaghan" wrote in message om... Tim, I'm disappointed by you lack of knowledge. Your word carries weight as an expert in these matters. Get expert. For example, 406 ELTs are dual frequency, broadcasting on 121.5 as well. Please read what I have said and understand I am not trying to argue the issue but offer some insight as to what I have found from my own investigation. I don't consider myself to be an expert but the information I gave I believe to still be true and have consulted the manufacturers and my distributors for their advice and understanding of the rules and proposals to new rule making. You are correct in that the new 406 ELT's will broadcast on 121.5 as well, also as a side note the 121.5 ELT's also already broadcast on 243.0 MHz. Suggesting that marine EPIRBs are the same as Aircraft 406 ELTs is the worst kind of obfuscation. I never stated these EPIRBs were in any way the same as Aircraft ELT's, in fact what I said or tried to say was these were NOT and should not be confused with Aircraft ELT's and I in fact stated just a couple of the differences.Please also note that I do not, and have not ever offered or suggested using anything but Aircraft type ELT's in aircraft...... While they take advantage of the same satellite resources, the boxes themselves are very different. A sunset date for 121.5 satellite coverage has been set for February of 2009. As I've noted, there are many other reasons the 406 units are better. These are just a few. There are also diffences in unit-to-satellite-to-receiving station visibility, accuracy, and time to verification of signal. Not the least factor is the false alarm rate, which introduces an adminstrative delay when any 121.5 signal appears. Here's a snip from the SARSAT link. For more information look at http://www.artex.net/images/pdfs/121phaseout.pdf from Artex, who BTW is one of the manufacturers I have spoken with about these issues. "Different types of ELTs are currently in use. There are approximately 170,000 of the older generation 121.5 MHz ELTs in service. Unfortunately, these have proven to be highly ineffective. They have a 97% false alarm rate, activate properly in only 12% of crashes, and provide no identification data. In order to fix this problem 406 MHz ELTs were developed to work specifically with the Cospas-Sarsat system. These ELTs dramatically reduce the false alert impact on SAR resources, have a higher accident survivability success rate, and decrease the time required to reach accident victims by an average of 6 hours. I'd still like to see where these statistics come from, I see the print, but nothing to substantiate this, it sounds to me like this is coming from someone who is trying to politicize this and is pushing for this.........I'd really like to see something more graphic with these statistics. From my own experience, I have not heard of any ELT failures to transmit, at least not in ELT equipped gliders......have you????? Can you name just one????? I have however heard of several instances where ELT's have be useful and have triggered in crashed gliders... There have also been several "False ELT signals" this we can verify, and in fact this has been somewhat of a problem with ELT's being set off by hard landings and even gliders being trailered, which tends to suggests they can and do go off rather easily and should function in a crash, not the reverse.......also, even new 406 ELT's will also be prone to this since any and all ELT's will still be designed around this same triggering system.(G-Switch) Understand, I am not trying to argue against 406 ELT's.sounds like a good idea to me, but they will not become a standard for some time, even 2009 is still 6 years away and many potential owners will by then have changed gliders and moved on....the 121.5 MHz ELT's are until then a very good and affordable option for anyone who is concerned ...making any rule to require glider owners to install $1500 ELT's to participate in a contest I think is going to meet with a lot of resistance and should any rule like this pass, I think contest participation will decline...on the other hand, should a contest organizer require the installation of a less than $200 ELT I think many potential participants may just decide this is not at all a bad thing and go ahead with an installation that can and has proven to be useful Respectfully.... Tim Mara Due to the obvious advantages of 406 MHz beacons and the significant disadvantages to the older 121.5 MHz beacons, the International Cospas-Sarsat Program have made a decision to phaseout 121.5 MHz satellite alerting on February 1st, 2009. All pilots are highly encouraged both by NOAA and by the FAA to consider making the switch to 406!" |
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