On RV-12 built as an E-LSA, a stall warning vane activates a microswitch that carries C37 Pin 11 to ground. As originally wired a stall would turn a Engine section widget on the EFIS red, bring up a PUSH title and activate a tone in the headset. After picking up the airplane at a paint shop, I used a handheld to fly home due to a loud squeal in the radio. Later I found the stall microswitch continuously activated, producing the loud tone through the COM's built-in intercom.
After resetting the stall warning microswitch, I now experience the red widget and PUSH label, but no audio tone when the stall warning is activated. All other aural voice warnings are functional. I found the stall sensor settings with the alarm off. I changed the alarm to self clearing, but no change.
The rest of the stall sensor settings are standard for a contact with range 5 enabled, PUSH, red 0.0-2.0V and range 4 enabled, not set, black, 2.0-5.0V. Ranges 1,2,3 not enabled.
In the hangar I can detect a very faint change in background noise when the stall warning is activated.
Any ideas of the problem? Any other diagnostics to try?
After resetting the stall warning microswitch, I now experience the red widget and PUSH label, but no audio tone when the stall warning is activated. All other aural voice warnings are functional. I found the stall sensor settings with the alarm off. I changed the alarm to self clearing, but no change.
The rest of the stall sensor settings are standard for a contact with range 5 enabled, PUSH, red 0.0-2.0V and range 4 enabled, not set, black, 2.0-5.0V. Ranges 1,2,3 not enabled.
In the hangar I can detect a very faint change in background noise when the stall warning is activated.
Any ideas of the problem? Any other diagnostics to try?
