air.guerner(at)orange.fr
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 Posted: Sun May 02, 2010 2:05 am Post subject: Bing carb corrosion |
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Hi all,
This is to share my personal experience on Bing carb corrosion.
During my annual inspection in April last year, I found some corrosion at the bottom of both carburettor bowls. At this time, the 912ULS engine was 4 year old and had 360 hours total, using mainly Mogas. This corrosion had produced some black particles (supposedly zinc oxide, as the bowls seem to be made of cast zinc-aluminum alloy) which could partially block the nozzles and prevent the carbs to work properly. I talked to the french Rotax distributor who said that they had never experienced such corrosion. After a thorough cleaning I reinstalled the bowls.
This year I decided to buy new bowls for replacement during the annual. Surprisingly, I found that the new bowls were now nickel-plated, certainly for a reason: preventing corrosion!
During the annual, I found some additional corrosion inside the bowls. As I had to also replace the 5 year old diaphragms, I inspected the piston and needle and did not find any corrosion on these components.
Conclusion: remove, clean and inspect carb bowls at least every year as recommended by both Europa Aircraft and Rotax.
Regards
Remi Guerner
F-PGKL
XS monowheel S/N395, 740 hours
<<<<<<<<The current FAA Nuts and Bolts Newsletter has an interesting article about
corrosion in a Bing carb on a Jabiru 3300 experimental aircraft (possibly a
Sonex) leading to an accident.
[url=]https://www.faasafety.gov/files/notices/2010/Apr/10-01%5B1%5D.pdf[/url]
(see p. 5). There are some good thoughts Re conditional inspections on Bing
carbs. >>>>>>>>>
[quote][b]
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