Thanks to everyone who responded so quckly. Armed with the HHDLU acronym I found more documentation via Mrs. Google.
Couple more questions if you guys don't mind: In general terms, where would the SSDFDR and CVR be installed on an A320? Would you access them from inside or outside the hull? Just need to know so I can describe in general terms what the guy with the HHDLU would have to do.
Thanks much!
Andy.