AD issued by FAA relating to biocide in fuel tanks and applicable to 737 MAX.
It appears that the AD prohibits operating 737 MAX aircraft involved in current flight testing programs until compliance with the AD has been attained. Pertains to CFM LEAP 1-B powerplants specifically.
http://services.casa.gov.au/airworth...2020-14-09.pdf
(Further discussion, see Tech Log)