After seven (?) incidents of landing gear malfunctions similar to the Jet
Blue incident, why has the FAA not issued an emergency Airworthiness
Directive on the Airbus A320?

Or has an AD been issued, but without the requirement to "ground" them
until
they've been repaired?
--

Why should they ground them ? It's just a few sparks, no big deal. These
planes have to work for a living and can't sit around waiting for some FAA
pencil pusher. Maybe they can get some mechanics in a truck to drive down
the runway under the plane and twist them back into alignment next time it
happens.