nonprecision approach การใช้

A problem for the Korean crew was that it apparently had not had enough practice at nonprecision approaches.
"We made a major corporate commitment to eliminate nonprecision approaches, " said US Airways A330 chief pilot Tracy Barnett.
They occur most often in " nonprecision approaches, " in which there may be left-and-right guidance from the ground but no altitude guidance.
On May 30, 1979 a de Havilland Canada DHC-6 Twin Otter operating the flight crashed during a nonprecision approach to Rockland's Knox County Regional Airport.
As a result the pilots were making a " nonprecision approach " and were supposed to select their altitude manually and keep a close eye on their altimeters.