(1) Friday's glitch started with an errant heater in one of the three auxiliary power units (APUs) in Endeavour - all of which must be in perfect working order for a launch to be allowed to proceed.

(2) E ures an up-to-date visual management of the APUs quality situation and reports results to the management.

(3) AMD is currently shipping the 32-nm Llano A-series APUs for production.

(4) Without getting too technical, the new A-series APUs are made using a 32nm manufacturing process and each processor core on the "CPU side" of the APU has 1MB of its own Level 2 cache.

(5) An ISS combines maintenance, logistics and access to spare equipment into a single package for both APUs and select avionics.

(6) Ensures an up - to - date visual management of the APUs quality situation and reports results to the management.