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  #1  
Old 07-26-2017, 10:47 PM
Strappe Strappe is offline
 
Join Date: Jul 2017
Location: Omaha, NE
Posts: 8
Default 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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  #2  
Old 07-27-2017, 05:21 PM
BOORSMA BOORSMA is offline
 
Join Date: Apr 2016
Location: Bakersfield, CA
Posts: 26
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What kind of an alarm is it? Is it a single tone?
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  #3  
Old 07-27-2017, 05:28 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 585
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Let's start with an easy one: Stall Warning alarm??
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RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 530+ hours (as of August 2017)!
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  #4  
Old 07-27-2017, 08:04 PM
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DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
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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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  #5  
Old 07-28-2017, 08:30 AM
Strappe Strappe is offline
 
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Location: Omaha, NE
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Canopy latch is OK. Green lights. And it goes away once underway.
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  #6  
Old 07-28-2017, 08:31 AM
Strappe Strappe is offline
 
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Location: Omaha, NE
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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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  #7  
Old 07-28-2017, 08:35 AM
Strappe Strappe is offline
 
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Location: Omaha, NE
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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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  #8  
Old 07-28-2017, 08:44 AM
alexe alexe is offline
 
Join Date: May 2013
Location: Temecula, CA
Posts: 210
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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.
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  #9  
Old 07-29-2017, 06:34 AM
BigJohn BigJohn is offline
 
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Location: Gloversville, NY
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Quote:
Originally Posted by alexe View Post
The Skyview logs should reveal the source of the issue. Copy them out to a thumb drive and take a look from your PC.
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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  #10  
Old 07-29-2017, 07:52 AM
Strappe Strappe is offline
 
Join Date: Jul 2017
Location: Omaha, NE
Posts: 8
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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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