Relief hole
A hole drilled at the point at which two bend lines meet in a piece of sheet metal. This hole spreads the stresses caused by the bends and prevents the metal cracking.
Aviation Maintenance Technician Handbook — Airframe, p. G-28
A hole drilled at the point at which two bend lines meet in a piece of sheet metal. This hole spreads the stresses caused by the bends and prevents the metal cracking.
Aviation Maintenance Technician Handbook — Airframe, p. G-28