One more Red Cube failure
I started having a problem with intermittent zero fuel flow (good fuel pressure & engine ran fine) after about 140 hrs TT. Sometimes it would show zero fuel flow at engine start then jump up to normal flow after half an hour or so and remain normal thereafter.
I checked all the wiring and connections and didn't find any problems. I removed the unit and blew low pressure compressed air through it and could hear the wheel spinning inside.
Finally I just bit the bullet and bought and installed a new one and the problem disappeared. Everything normal.
Out of curiosity, I disassembled the old unit to see if I could see a problem. It's pretty simple inside and I didn't see anything that looked like it would cause a problem.
Interestingly, the new unit (from AS&S) came with three connectors, one for each wire, that I hadn't seen before. Each was a small sleeve with an allen screw in the middle. It's like a small butt splice except the wires overlap inside the sleeve and the allen screw is tightened to secure the splice. Seems pretty secure.
__________________
Tom
Port Orange, Fl
EAA #51411
RV-12 N121TK ELSA #120845; first flight 06/10/2015; 700 hrs as of 02/2020
RV-12 N918EN ELSA #120995 Eagles Nest Project; first flight 05/18/2019
SPA Panther N26TK; First Flight 03/13/2020
|