MacCool
Well Known Member
I have an FT-60, firewall mounted, on my RV-9A with IO-320...TT380 hours...and it reads on the display of my AFS 5400 EFIS. Over the last few days, I'm getting intermittent fuel flow readings, sometime low, but more usually it either reads zero fuel flow or it reads what I take to be normal. It will go on and off several times in a flight. Every time it goes offline, I get a "check fuel computer" audio warning.
I realize that the first thought is going to be "dead Red Cube" as this seems to be a recurring theme with that device and the symptoms are pretty classic. I'd just empirically replace it, but for a little backstory:
I recently replaced my legacy AFS 4500 with an AFS 5400. In the wiring switchover, the Red Cube didn't make the trip and I ultimately found an install manual error on the wiring leading to the FT-60 not getting any power from the EFIS. I noticed this by putting a voltmeter on it, reading zero volts all the time. Not intermittent like it is now. Once I got the harness re-pinned, about 3 weeks ago, it's been working fine. I did re-check the harness today and the Red Cube is getting the normal 8 volts, at least at that moment, with the plane sitting on the ground. The connections all look solid and pass the jiggle test.
Question...is there some other way I can evaluate the FT-60...bad power connection vs bad wiring other than just installing a new one?
I realize that the first thought is going to be "dead Red Cube" as this seems to be a recurring theme with that device and the symptoms are pretty classic. I'd just empirically replace it, but for a little backstory:
I recently replaced my legacy AFS 4500 with an AFS 5400. In the wiring switchover, the Red Cube didn't make the trip and I ultimately found an install manual error on the wiring leading to the FT-60 not getting any power from the EFIS. I noticed this by putting a voltmeter on it, reading zero volts all the time. Not intermittent like it is now. Once I got the harness re-pinned, about 3 weeks ago, it's been working fine. I did re-check the harness today and the Red Cube is getting the normal 8 volts, at least at that moment, with the plane sitting on the ground. The connections all look solid and pass the jiggle test.
Question...is there some other way I can evaluate the FT-60...bad power connection vs bad wiring other than just installing a new one?