PPRuNe Forums - View Single Post - Blackout Bug: Boeing 737 cockpit screens go blank if pilots land on specific runways
Old 9th Jan 2020, 07:18
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MechEngr
 
Join Date: Oct 2019
Location: USA
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Originally Posted by ReturningVector
I think the article related the bug to the true direction, not the magnetic direction of a runway.
Ahh, true heading - OK.

What is unclear is why there is also a connection to latitude and longitude.

I looked at the airports - based on data from https://www.airnav.com these are the deviations in degrees from 270:

82V -0.009377087
KBJJ 0.001984966
KCIU -0.024015687
KCNM 0.017476942
PABR -0.00926391

AirNav provides Lat/Long for each end of the runway which I converted with ATAN to a degrees variation. It did not list the last two.

SKLM, is listed as runway true heading: 272.4 on SKLM - Jorge Isaac Airport and
SYCJ is listed at 271.9

So it's a mystery. While I can imagine truncating the true heading to one place would be a problem, I can't see where they would truncate the true heading by more than 2 degrees.
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