from the south, because of rapidly rising terrain south of the airport. This higher altitude allows a flight crew to clear the obstacle if a landing is not feasible. In general, each specific instrument approach specifies the minimum weather conditions that must be present in order for the landing to be made. See also Marker beacon Final approach Further reading References Audio and multimedia resources Audio and commentary of a full-procedure RNAV (GPS) approach into Flint Bishop International Airport (KFNT) Audio of a US instrument rating checkride – Part 1 (including RNAV 18 at KFNT) Audio of a US instrument rating checkride – Part 2 (including VOR 9 at KFNT partial panel and the ILS 9R at KPTK) External links Flight Crew Guide – Precision approach – Category I operations Flight Crew Guide – Precision approach – Category II operations Flight Crew Guide – Precision approach – Category III operations Flight Crew Guide – Non-precision approach Aircraft instruments Air traffic control Types of final approach (aviation) Aviation publications