A320 reference triangles
After more than eight years on the 'Bus I find I have forgotten so much that I had learned from the first generation of drivers that had really gotten into the "nuts and bolts" of the airplane. Now, I'm not sure if I recall this correctly or not but if anyone has a reference on the following I would appreciate it being forwarded to me.
On each side of the aircraft fuselage, from just below the aft cockpit window to just forward of the rear door,there are 5 (maybe 6) evenly spaced, 2 cm/side metal triangles. They have a very small hole in the centre. While it is commonly accepted that they are reference markers, I recall being told (and shown) that they had another function. I've been through old paper FCOMS and the latest computer FCOMS but cannot find any reference to them at all.
Anyone else ever been told, or shown, anything about them?
Regards,
DLF