 A team of about 30 engineers are still based at MAN earning revenue from various other airlines.It also consists of the Avionic division which is based at Pontyclun, South Wales, which services the majority of the removable avionic units, and some mechanical components.There are now 3 main maintenance hangars at Heathrow, these being (TB standing for technical block) TBJ, TBK and TBA along with a huge maintenance hangar called the "Cathedral" and TBE plus engineering's main Headquarters building called TBC.