During the pre−flight planning phase RAIM prediction must be For En-Route mode the RAIM containment radius value should be under 2 NM, terminal mode under 1 NM, and approach mode 0.3 NM.Īnswer lies on AIM 5-1-16 "rnav and RNP operations" paragraph f:į. The requirements for the value of the containment radius depend on the flight phase.
The value of the containment radius depends on the geometry of the satellites. The containment radius is the maximum size that a position error can grow due to a fault in the GPS system without the RAIM algorithm being able to detect it. There are various categories of RAIM such as Fault Detection and Fault Detection & Exclusion but all RAIM algorithms will give you a containment radius. It continuously monitors all satellite signals for consistency and flags any inconsistencies. The FAA website does not say anything about the actual quality of the GPS system during your flight. You must use alternative navigation means if GPS RAIM is not available. A single fault in a GPS satellite or, more likely, a corruption in the downlinked GPS satellite almanac will cause the position fix to be off. The GPS may still work fine, but there is no way to check its integrity. If there is no RAIM available during part of your flight, you can't rely on GPS during that part. The FAA website predicts the availability of RAIM based on the constellation of GPS and the health status of its satellites, the route and the time of flight it is possible to calculate whether RAIM is available for your flight.
If there are only 4 satellites visible, or more than 5 but with an unfavourable geometry, RAIM cannot work and therefore the GPS receiver cannot be certain that the produce position fix is correct. For GPS without RAIM, at least 4 satellites are needed. It is a part of aviation graded GPS receivers that checks consistency of all used GPS satellite signals in order to raise an alert if the GPS system is not working correctly.įor RAIM to work, there must be at least 5 usable satellites in view of the GPS receiver. RAIM stands for Receiver Autonomous Integrity Monitor. It will only show whether the RAIM function is available during flight. The pre-flight FAA website check is not a substitute for the use of the RAIM function during flight. The RAIM algorithm will tell you during your flight if GPS is working correctly. Please provide some guides for this topic for MK2S and MMU.The FAA website predicts pre-flight whether RAIM will be available
#Preflight check update
I guess that the second press is what triggers this question but some clear instructions would definitely help and possibly update the LCD display after first press to let the user know to click again.Īlso I seem to have to press unload more than once and guide it by hand. I have seen Jakub's comment that there are two speeds but have not yet tried it again. The load option seemed to just keep feeding filament forever and I had to reset the printer, later I saw a yes/no option for filament colour being correct (new replacing old) but still do not know how this gets triggered. My comment was linked to a video but it is a bit vague. I think this is a topic that should be covered in the guides for both the MMU and the MK2S. Having had a different 3D printer where it was done by hand I did not realise to use the LCD menu options for the MK2S at first. I agree, I would hope for some guidance on loading/unloading filament for the MMU.
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