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From: "Alejandro R. Mosteo" <alejandro@mosteo.com>
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Subject: Curious bug in 737 glass instruments
Date: Fri, 10 Jan 2020 17:07:04 +0100
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Came across this one in pprune the other day:

https://www.pprune.org/rumours-news/628664-blackout-bug-boeing-737-cockpit-screens-go-blank-if-pilots-land-specific-runways.html

https://www.theregister.co.uk/2020/01/08/boeing_737_ng_cockpit_screen_blank_bug/

 > "All six display units (DUs) blanked with a selected instrument 
approach to a runway with a 270-degree true heading, and all six DUs 
stayed blank until a different runway was selected," noted the FAA's 
airworthiness directive, summarising three incidents that occurred on 
scheduled 737 flights to Barrow, Alaska, in 2019."

 > Although full technical details were not given in the airworthiness 
directive, the FAA said that the seven runways had "latitude and 
longitude values" that "triggered the blanking behaviour", suggesting 
some kind of memory interaction between onboard computers causing the 
screens to stop displaying any information until a different runway was 
selected in the flight plan.

 > The bug affects 737-600, -700, -700C, -800, -900 and -900ER model 
aircraft, which are running Common Display System Block Point 15 (CDS BP 
15) software for their display electronic units (DEUs) together with 
flight management computer (FMC) software version U12 or later.


Just wondering if some Ada is be involved...