4 ms·

I get the gist of what you are saying about it being par for the course, but can you explain why a heading of 270 (West if 0 is North)would affect air worthines

by eggy 7y ago

I get the gist of what you are saying about it being par for the course, but can you explain why a heading of 270 (West if 0 is North)would affect air worthiness? Is it something to due with true North vs. magnetic north deviations? Grasping here. I am truly curious about this one. Thanks!

bradhe 7y ago
Air worthiness is determined by the FAA. In this case, the aircraft are only considered not airworthy when the flight plan calls for landing on one of those runways. Operating them in any other configuration is A-OK. As to why the bug exists, who knows :) Edit: Clarified slightly.
jonas21 7y ago
It affects airworthiness because the displays went blank when certain ILS approaches with heading 270 were selected. This is unexpected and would require the flight crew to fall back on other instruments. The FAA routinely issues airworthiness directives for all sorts of safety issues. Here are a few others published in the past week or so: https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/f0ddb5e68a9223aa862584ff00566373/$FILE/2020-01-17.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf... https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/f44c3d2f513d5268862584f900515e04/$FILE/2020-01-14.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf... https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/4aea68db57652880862584f900515ce0/$FILE/2019-26-01.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf... https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/85e929ccd96d5695862584f900515b4c/$FILE/2019-25-20.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf...
dlgeek 7y ago
Based on the AD, I suspect they're doing some sort of math on the longitude coordinates of the runway borders/endpoints. ("[O]nly seven runways worldwide, as identified in this AD, have latitude and longitude values that cause the blanking behavior.")

by eggy 7y ago

bradhe 7y ago

Air worthiness is determined by the FAA. In this case, the aircraft are only considered not airworthy when the flight plan calls for landing on one of those runways. Operating them in any other configuration is A-OK. As to why the bug exists, who knows :) Edit: Clarified slightly.

jonas21 7y ago

It affects airworthiness because the displays went blank when certain ILS approaches with heading 270 were selected. This is unexpected and would require the flight crew to fall back on other instruments. The FAA routinely issues airworthiness directives for all sorts of safety issues. Here are a few others published in the past week or so: https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/f0ddb5e68a9223aa862584ff00566373/$FILE/2020-01-17.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf... https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/f44c3d2f513d5268862584f900515e04/$FILE/2020-01-14.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf... https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/4aea68db57652880862584f900515ce0/$FILE/2019-26-01.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf... https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/85e929ccd96d5695862584f900515b4c/$FILE/2019-25-20.pdf https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf...

dlgeek 7y ago

Based on the AD, I suspect they're doing some sort of math on the longitude coordinates of the runway borders/endpoints. ("[O]nly seven runways worldwide, as identified in this AD, have latitude and longitude values that cause the blanking behavior.")