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Old 08-28-2019, 08:42 AM
DHeal DHeal is offline
Join Date: Sep 2006
Location: Windsor, California
Posts: 878
Default Ignition Checks at Various RPMs?

Occasionally I would like to verify the independent operation of each of the ignition modules on my 912 ULS at times and RPMs other than during the usual 4,000 RPM run-up. Is there any danger to the engine if I perform an ignition check at 2,000 RPM?, 3,000 RPM?, 5,500 RPM?, etc?

I know that an after-fire event in the exhaust system is typically a concern on some engines if too much unburned fuel is introduced into the exhaust system following an ignition check at high RPMs. Any concern here for the 912 ULS?

Thanks -- David
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 910+ hours (as of May 2020)!
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Old 08-28-2019, 09:44 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,814

I check ignitions often while flying especially if flight plan takes me over water. Simply shut off one ignition at a time and look for RPM drop. Goes without saying to be careful not to shut off both ignitions otherwise you'll be flying a glider...
Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 542

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MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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Old 08-30-2019, 09:34 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,694

From the ROTAX course it appears the only think special about4000 RPM is to be at a high enough RPM where carb imbalance is not a issue for rough running.
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