An Airworthiness Directive had been issued, with a 36-month compliance from 16 January 2020, to install an insert over the apex pin bore to prevent incorrect installation of the downlock pin, but this had not yet been implemented on G-ZBJB.
I wonder how many airlines will now have had a "oh hell" moment and be rushing to complete this presumably simple maintenance task to block up the wrong hole to prevent reocurrence. Cost per aircraft to rectify is less than $2K and takes 2 hours, according to this:
https://www.federalregister.gov/docu...pany-airplanes
Seems like the exact same problem has happened at least three times now...