At 11:16 AM 5/07/05 +0930, you wrote:
>Mike B reckons the ATSB is comfortable with ADS-B having a 25% false
>negative rate (because it's only expected to prevent 75% of midairs).
>Do we have any data whatsoever on whether FLARM's false negative
>rate exceeds that of ADS-B ?
I didn't say that. That was the result of looking at the midairs that have
occurred since the late 1960's and given the circumstances, whether ADSB
used in an air to air mode would maybe have prevented them.
I found the number prevented rather lower than I would have expected. The
vast majority were in the circuit or close to airfields.
One of the accidents was the two CAA aeroplane drivers who ran into a
thermalling Blanik at Tocumwal shortly after takeoff. ADSB might have
prevented that, FLARM might have prevented that, looking out the windscreen
could have prevented that.
Neither ADSB nor FLARM is ever going to be universal so the issue of false
negatives is rather a red herring, lookout will still be required. There is
a large occurrence of false negatives now with radio use at MBZs.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
Int'l + 61 429 355784
email: [EMAIL PROTECTED]
website: www.borgeltinstruments.com
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