19:53:10 Canceled third cal since cals were started 2 mins late, and taxiing started slightly early. Unclicked purge, and set calint to 50, and reset auto control Allowing WT one more cal, and then will set WTFreq to 4 20:23 Forced calint to 15 to start the third cal with WT. 20:39:45 Even though I set calper to 15 to give myself a little extra time to set it back to 50, I just missed changing it to 50 and had to unclick purge of HS (I think). But set calper back to 50, WTFreq to 50. Note that data between 20:39:45 and about 20:46 should be exluded As system P/O2 is reequilibrating. BEST data to constrain concentration at 40Kft is from 20:38-20:39:30, where the signal is quite stable 21:32 Have noted that flow and fill P (at least MEDPSA) seem to have dropped between RF03 and RF07. Plan to check this thoroughly in NZ before SP flight. Could be: inlet filter clogging from wet tropics at summer and high moisture content/flow rate. Could be: that I filled a little more beads each of the last couple of flights (2.5" or so from bottom instead of 2") Inlet P has, if anything, climbed back up to close to PSX over the last few flights, which should allow more flow. 20:11 At 9 N supposedly doing high ascent into the ITCZ, but seeing a lot of stratified cloud decks, and not much major cumulonimbus 00:33:30 AO2 lamp dies.CO2 still works. PdS (WT, SP, O2) all fine, but 4 attempts to relight lamp fail. 00:52:10 Hit Stop, shut down boxes, restart boxes as per checksheet. Enabling Spark box to allow longer spark did not work. Signal is drawn down while spark is going but probably just because of V drawn to activate sparker Have gone back to just sampling CO2 for a last bit of flight. Britt's Instructions: So, plan for post-flight - please shutdown and power everything off while on final descent so that it is all powered down when the wheels stop. Then. . . A) open AO2 box lid and remove the 14 screws from the top of the lamp box (taking care not to drop any in the box). The hex driver for these I think is in the blue satchel and there should also be a rt-angle hex to get them started. B) Remove lamp box lid and inspect lamp, power supply and sparker, especially wire that comes from center of coax from power supply and solders onto the RF coil at the standoff - is it still soldered on? C) Is the standoff still holding and does it look like there is plenty of clearance between this solder joint and the box lid/wall? D) Inspect lengths and both ends of all wires going in/out of the lamp box - any signs of rubbing/wear or pins plinked out? I'll try to look up where each wire goes in the meantime. E) Inspect 15 V wire going to stud on side of RF power supply - still soldered on? F) If all looks good inside lamp box, then power up all 3 boxes, vnc into AO2, start program, turn on Pump 2 and open Man vac valve, and click initialize cal flow. G) Once PdO2 is controlling (what are PaO2 and PdO2 now?), click RF on and Spark for 2 seconds. Do you see/hear the sparks? Does the lamp light? If not, does the lamp flicker at all? coax has RF between inner-wire and shield. Inner-wire solders to one end of coil (antenna) and shield solders to other end. The coil is made of copper magnet wire with a thin brownish-red plastic coating. At the solder joints, the magnet wire is bent to take a screw/nut and the outer part of this bend is filed off to expose bare aluminum. The inner-wire from the coax is then soldered on to the outer edge of the bend of the coil at the stand-off. Ideally this is done in such a way that the fat coax+insulation is not under any strain. But, there probably was some strain and the solder connection probably wasn't perfect, and it eventually plinked off SO: the steps to remedy this are fairly straightforward, and it's just a question of how easy it is to do in place. My recommendation is to unscrew the coil from the standoff and bend it up ~ 1/2 inch to have clear access. Then, try to orient coax so that it is relatively strain-free and solder inner wire back to coil. You basically hold the inner-wire tangential to the coil and put a big glob of solder on. It's a bit tricky to get the coil hot enough because it is such a big mass, but it's important to heat the coil with the iron to the point that it melts the solder, and not just melt the solder onto it (the latter leads to easily broken solder joints). If you're unsure on technique, I'm sure Greg (is is spades or clubs - tech) or Fred would be happy to look over your shoulder. also, as soon as you have the coil soldered you can test lighting the lamp (the coil does not have to be on the standoff, and the lid does not have to be closed. In fact you could try it now just holding it on, but that isn't at all necessary. Enjoy the snorkeling and see if you can talk Pavel into Maint/Fly/Maint/Fly/Maint/Fly/Raro-HD2 instead of what he sent me which was Maint/Fly/Maint/Fly/CHC-HD/Maint/Fly Ah, good point. There is an LED on the sparker board that detects if the lamp is on or not. . . . but if it has failed it will bring down the lamp. This is more important than CO2, so after answering my question about whether you see any life in O2 signal during sparking, please stop program, click on "main" in the form menu on the upper right of the VB screen, then click on the tiny button just above this list that brings up the form (next to a button that brings up the code). Assume you mean Raw plot 1, right? Signal certainly shot up in raw plot, but didn't engage Once you have the main form up, you should be able to click on this check box, then look to the lower right of the screen where there is a "properties" list. Then scroll down the properties list until you find "enabled" and set it to true. Then click the play button and go back into CO2 only meas mode starting with calint = 50 and code of "c" My best guess (/hope because it's an easy fix) is that the wire broke off the coil, which would be consistent with what we're seeing The other possibility is that the RF power supply is completely dead - but this seems less likely and also a more involved repair