rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Fri Aug 09, 2013 1:58 pm Post subject: Rotax part 966726 ignition modules |
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I recently had a hair-puller-outer problem with a 912 ULS that would not start. Since both carbs leaked fuel out the overflow tubes and they had not been rebuilt ever, I did that. In studying the aircraft's fuel system and studying the Rotax manual I found the fuel system had no return line. Having not crafted a fuel system for a 912 before, and finding the schematic in the IPC clear as mud, I contacted Roger Lee off list for some advice. Like many on this list I've learned a lot from Roger and having him take the time, while on vacation mind you, to give me the part numbers to order is a testimony to his character, but that's an aside to this story.
All plumbed up, no joy on getting the engine to fire. Did all the diagnostics and it boiled down to the ignition modules.
Fortunately, there is a message on the Rotax.com forum about ignition modules that would not fire below a certain rpm and advised sending them to Lockwood to be tested. Last Monday I called Lockwood, they emailed a work order and I forwarded it to my customer so he could mail them out for testing.
In talking to Aaron, he said this was a known problem. Some 966726 modules go south and will not fire until some elevated rpm not reachable with a starter. With their test system Lockwood can spin them up and determine the point where firing begins. They have found that once they do fire, the modules sometimes return to the correct firing rpm for awhile but when allowed to set for a day or two will redevelop the defect.
Bottom line of this missive is that if you have a problem with engine starting and you have done all the trouble shooting to make sure that an ignition is not inadvertently grounded out at the switch or the wiring, it may be worth your time to send them to Lockwood for testing.
I don't know if L.E.A.F. or CPS can do this test, the fellow who sent the message used Lockwood so I did too.
There's an upside to this story. The new modules, p/n 966727 have the capabilities of the 'Soft Start Module" built in. Rotax, aware of the problem with the old moduels has a special price for the new modules, $913, that is less than half the cost of the old modules and if you order them from Lockwood they waive the cost of testing the old modules so you save a further $50, too.
Rick Girard
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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