Optimum countersink depth for Boeing aircraft is 67% (or less) of the sheet thickness.They state this percentage helps to reduce possibility of fatigue cracking. During repair they allow up to 80% of the sheet thickness for countersink depth.
Optimum countersink depth for Boeing aircraft is 67% (or less) of the sheet thickness.They state this percentage helps to reduce possibility of fatigue cracking. During repair they allow up to 80% of the sheet thickness for countersink depth.