AGL means above ground level.
ALS means approach light system.
ASR means airport surveillance radar.
ATC means air traffic control.
CAS means calibrated airspeed
CAT II means Category II.
CONSOL or CONSOLAN means a kind of low or medium frequency long range navigational aid.
DH means decision height.
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.