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Aug 6th B738 and Glider Near Miss. Frankfurt
On Oct 16, 11:47*am, "Matt Herron Jr." wrote:
On Oct 12, 12:00*pm, India November wrote: On Oct 12, 6:25*pm, Darryl Ramm wrote: On Oct 12, 2:08*am, John Smith wrote: Darryl Ramm wrote: --- Moving topic somewhat but I want to make the point that we've lost several airliners full of passengers in fatal-midair collisions with light-aircraft and the response to that was largely transponders and TCAS/ACAS. And gliders operating near high density airline and fast jet traffic without transponders are effectively bypassing that evolution. I worry that human nature and perception of risks can allow apparent reduction of risks in situation because we don't perceive those rare but critical accidents happening frequently enough to register as practical risks even if they have catastrophic outcomes. I start my talks on collision avoidance with the following (USA centric information). There are similar fatal mid-air collisions outside the USA. Allegheny 853 MD DC-9 vs. Piper Cherokee Fairield, Indiana 1969 -- 83 killed Pacific Southwest 182 Boeing 727 vs. Cessna 172 San Diego, California 1978 -- 144 killed Aeroméxico 498 (the mid-air that lead to Mode C transponder and TCAS carriage requirements in the USA) MD DC-9 vs. Piper Cherokee Cerritos, California 1986 -- 82 killed, 8 injured NetJets N879QS Hawker 800XP vs. Schleicher ASG-29 Reno, Nevada 2006 -- 3 minor injuries (we were very lucky) Darryl Yes terrible accidents such as those cited motivated the regulators and industry to require the carriage of transponders. The FAA Near Midair Collision Avoidance database suggests that annual reports of reported near midair collisions in the US have decreased in number since the 1980s. http://www.asias.faa.gov/portal/pls/...pp_module.show... Still, only 45 of 6624 records (0.6% of the total) in the NMAC database contain the term "glider". Only nine records contain the terms "glider" and "US air carrier". The other 6579 reports (99.4%) do not involve gliders. Many of these other reported near midair collisions presumably happened between transponder-equipped powered aircraft. In conclusion, experience shows that the possibility of a mid-air collision between a glider and an air carrier is real enough (and warrants prudent action) but let's put it into perspective. Gliders form a very small part of the total collision risk that commercial passengers are exposed to. Ian Grant IN There are a lot more GA flights/yr than glider flights/yr. *It would be interesting to see these statistics stated as a % of all glider flights and % of all GA flights (I know this is not possible for gliders as there is no record of the number of flights). I bet the ratio would be a lot closer, if not reversed...- Hide quoted text - - Show quoted text - It's possible that near midair collisions between gliders and air transport aircraft are under-represented in the NMAC database because gliders are hard to see, so the airliner crews and ATC may be unaware of some incidents that the glider pilots know about. For sure. However, there is no reason to suppose that any aircrew who knows of a near midair collision with a glider is less likely to report it than a similar incident with another category of aircraft. Indeed my sense is that ATC and airliner crews are darn near paranoid about gliders and have a greater propensity to report such incidents. This observation knocks on the head the assertion that gliders are seriously underrepresented in the NMAC statistics, and supports the conclusion according to these statistics that most near mid-air collisions involve transponder-equipped powered aircraft. In the following tragic example near Toronto the radar data from transponder returns were used to plot the fatal flight paths! http://www.tsb.gc.ca/eng/rapports-re...6/a06o0206.pdf Airspace separation is the best bet. Ian Grant |
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