Due to wake turbulence medium ac behind heavy shall wait at least 2mins for t/o and light ac behind medium or heavy for 3 mins.
CO PY RE ST :
5 6 8 14
CO - Cholera - 5 days
PY- Plague and yellow fever - 6 days
RE- Relapsing fever - 8 days
ST - Small pox and Typhus - 14 days