So, I'm watching some YouTube videos of A320 series takeoffs. Airbus are renowned for the 'double flash' strobe effect, but on a lot of the videos it seems as there is only one distinct flash. I know that there are actually two high intensity strobes per wing, but are they actually sequenced to *double flash*?
Reading the AMM, I can see that they are timed at 60 flashes per minute, +/- 10%. Is it just this 10% tolerance that provides the unique effect, and that theoretically they should flash at the same instant?