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07-26-2017, 10:47 PM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Alarm that I cannot identify
I get an alarm when stationary with engine at about 4100 Rpm, oil temp 125 F, no message. Reduce throttle and it becomes chattery then quits. Same deal on initial take off run, but stops after only a few seconds. Flew an hour with no alarm, then it sounded during roll out after landing.
No visual clue that I can find to tell me what it is. Recently replaced throttle springs and installed new 2020 gps antenna. At first, the backup battery low charge message was present, but it is recharged now and I got the alarm again.
Other suggestions?
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07-27-2017, 05:21 PM
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Join Date: Apr 2016
Location: Bakersfield, CA
Posts: 29
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What kind of an alarm is it? Is it a single tone?
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D. Boorsma
RV-12, Bakersfield, CA
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07-27-2017, 05:28 PM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 920
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Let's start with an easy one: Stall Warning alarm??
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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 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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07-27-2017, 08:04 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,246
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Skyview or older D180? If it's a Skyview, the RPM makes me wonder if it's the canopy latch alarm.
Not that I know what it sounds like, since I have a D180.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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07-28-2017, 08:30 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Canopy latch is OK. Green lights. And it goes away once underway.
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07-28-2017, 08:31 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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I thought that could be it, but would the stall warning go off while stationary and running engine up on ramp?
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07-28-2017, 08:35 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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It starts as a steady. high pitched tone, and then becomes beep beep beep beep and stops. If I am stationary and run engine up a bit higher than the 4,000 RPM for ignition check, it remains steady, and quits when I lower RPM. It typically does not come on during landing but does sound briefly during roll out. No lights on panel. I have the display set to show CHT, not coolant temp. Someone here suggested it could be that the coolant temp is too low. That seems unlikely if it also goes off during the roll out after landing after an hour flight.
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07-28-2017, 08:44 AM
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Join Date: May 2013
Location: Temecula, CA
Posts: 295
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The Skyview logs should reveal the source of the issue. Copy them out to a thumb drive and take a look from your PC.
__________________
Alex Erdelyi
RV-9A Purchased
RV-12 Built and Sold
Paid through December, 2020
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07-29-2017, 06:34 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Quote:
Originally Posted by alexe
The Skyview logs should reveal the source of the issue. Copy them out to a thumb drive and take a look from your PC.
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I was just about to suggest the same thing. Even if it does not point directly to the problem it will allow you to eliminate a bunch of stuff.
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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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07-29-2017, 07:52 AM
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Join Date: Jul 2017
Location: Omaha, NE
Posts: 42
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Thanks for the log suggestion. I tried to find them within Skyview itself and of course, couldn't, but didnl't think about exporting them to an Excel file.
The culprit is the AoA alarm.
AOA_16_16
AOA_16_16
AOA_13_16
AOA_16_16
AOA_01_16
AOA_13_16
AOA_04_16 and so forth.
I cannot find any evidence on the exterior of this used RV-12 that an AoA port has been installed. It is clearly not present on either wing. But the AoA alarm was set to YES. (We're still sorting out this newly acquired -12.) How would the AoA alarm sound if there is no AoA pressure port on the wings (suggesting it isn't installed)?
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