{"id":4648,"date":"2019-07-07T23:34:45","date_gmt":"2019-07-07T23:34:45","guid":{"rendered":"https:\/\/stjohn.openbar.com\/airplane\/?p=4648"},"modified":"2019-07-13T22:37:07","modified_gmt":"2019-07-13T22:37:07","slug":"all-together-now-2","status":"publish","type":"post","link":"https:\/\/stjohn.openbar.com\/airplane\/?p=4648","title":{"rendered":"All Together Now"},"content":{"rendered":"

Finally, after four months of interruptions, priorities, fragmented blocks of time, and truly awful weather, some of which begat the need for a new rudder, N313TD is back to operational status.\"\"<\/p>\n

When I installed the new RDAC, I had to leave the left side CHG and EGT probes unconnected, because the wires wouldn’t reach the new RDAC location.\u00a0 Yesterday, I ran the K-type extensions from both sets of probes to the new location and connected them accordingly, and as far as I know, they all go to the right terminals.\u00a0 To truly test it out, I need to heat up the cylinder head and probes with a heat gun to find out which is which, but that’s not happening at a tie down in Santa Monica.\u00a0 \u00a0I know 1 and 3 are right.\u00a0 It’s 2 and 4 that might not be.\u00a0 You see, I ran the wires and wrapped them in spiral wrap before I thought to mark which was which.\u00a0 \u00a0The photo above shows a messy, but functional arrangement with enough extra wire to allow switching terminals, although I believe I can set them in the EFIS.\u00a0 At that point, I can clean them up and make them all nice.\u00a0 But for now, they’re secure and self-supporting, so I’m good.<\/p>\n

The other thing that happened on the way to the new RDAC module was that I somehow picked up an extra 2500 ohms between the fuel tank and the Fuel Level inputs.\u00a0 This new RDAC has a DIP switch for a pull-up circuit on most of the sensor inputs.\u00a0 The manual says you’re supposed to have the pull-up on for float-type senders, but if it’s on, the resistance drops to zero and the fuel level reads full.\u00a0 Not useful.<\/p>\n

With the pull-up circuit off, ~8 gallons reads about 1500 ohms, according to the raw level reading in the EFIS.\u00a0 \u00a0One of my tanks is pretty much there, because I leveled the airplane and the fuel on the left side is juuuuuust touching the outboard rib of the tank.\u00a0 So I half-assed it using the settings below until I can properly calibrate by emptying each tank and adding back 3.5 gallons at a time.\u00a0 \u00a0The gradations are from the previous measurements.<\/p>\n

<\/p>\n

Opinions are strong on this, with most of them in the key of “you should use a totalizer and do the math” and “if you keep track of what you put in and the time you fly, you don’t need a gauge.”\u00a0 \u00a0But the saner voices acknowledge that fuel gauges are a good redundancy to a totalizer, and I tend to agree.\u00a0 Either way, I now have everything I had before the old RDAC went tits-up, and then some.\u00a0 #1 and #3 CHT’s aren’t randomly dropping out anymore, and the left-side fuel level doesn’t randomly jump from its normal reading to full tank.\u00a0 The EFIS is still a mess.\u00a0 I can’t get it to take the latest update and it can’t read any of the raster maps I’ve uploaded, and I’m getting pretty damn good at QGIS, so I’m not as happy with it as I should be.\u00a0 But it’s still performing well for a 2010 unit that’s no longer being manufactured.<\/p>\n

Did I mention I was doing this stuff outside at a tie down at SMO?\u00a0 Yeah, about that.\u00a0 No electricity, so no luxuries, specifically, no heat gun, which means yours truly was shrink-wrapping wire with a barbecue lighter and a cupped hand.<\/p>\n

All repairs are field repairs, yo.\u00a0 \u00a0Can’t wait to install the Fed-mandated ADSB equipment before 2020.<\/p>\n","protected":false},"excerpt":{"rendered":"

Finally, after four months of interruptions, priorities, fragmented blocks of time, and truly awful weather, some of which begat the need for a new rudder, N313TD is back to operational status. When I installed the new RDAC, I had to leave the left side CHG and EGT probes unconnected, because the wires wouldn’t reach the […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3,5,83],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=\/wp\/v2\/posts\/4648"}],"collection":[{"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4648"}],"version-history":[{"count":6,"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=\/wp\/v2\/posts\/4648\/revisions"}],"predecessor-version":[{"id":4657,"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=\/wp\/v2\/posts\/4648\/revisions\/4657"}],"wp:attachment":[{"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stjohn.openbar.com\/airplane\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}