Dual surefly installs?
I understand Sure Fly is now approved for dual Sure Fly installs as long as you have a backup battery. Wondering if anyone has done it. My Sure Fly and my bag both have about 1000 hours on them. So I’m thinking that the mag is going to be replaced soon and I’m considering going to the Electronic Ignition system.
Comments
My thinking is that even with a single E-mag, that a backup battery would be a reliable setup. If the E-mag fails or the electrical system fails, the engine is now running on a single mag...not a reliable situation, especially with an older mag.
So, with a dual E-mag, it's more important , besides being required, to have a substantial backup battery of at least 4 amp-hours, larger is better, since each E-mag needs 1.1 amps, to have 2+ hours of battery to power the E-mags.
So, a diode isolation setup is needed, allowing the E-mags to be powered from the main battery or the backup battery, with an alert to indicate that the E-mags were operating on the backup battery, so that the pilot can plan for landing somewhere within an hour or so.
If flying at night or IFR, then the backup need to be able to power some essential avionics as well, adding to the amp-hour capacity of the backup battery. This would require having an 'essential' bus, if the aircraft doesn't already have one.