here the AIM from eurocontrol:
SUBJECT: HIGH DELAY DEST EGLL
.
OPERATORS AND ATC UNITS ARE ADVISED THAT THERE ARE MAJOR DELAYS
IN THE FOLLOWING AREAS: ARRIVALS AT EGLL
.
DELAYS ARE CAUSED BY DISABLED AIRCRAFT ON RWY
DELAYS ARE AS FOLLOWS:
.
-------- ARE UP TO 60 MINUTES--------------
.
FMD STAFF ARE CONTINUOUSLY MONITORING THE SITUATION AND WILL
ADVISE OF ANY POSSIBLE IMPROVEMENTS.
IN THE MEANTIME OPERATORS ARE STRONGLY REQUESTED NOT TO TELEPHONE
FMD HELPDESK ABOUT DELAYS WHICH ARE TYPICAL/AVERAGE.
.
FMD BRUSSELS.