The general visibility on the main runway ( 28/ 11 which is the most preferred runway by airlines during the foggy days) was almost zero while the runway visibility
was 75 metres.
Currently, Salzburg is certified for approaches to Cat I (60 metre decision height, 550m runway visibility
The general visibility and the runway visibility
worsened after 2.30 a.m.
The general visibility dropped to less than 50m while the main runway visibility
dropped to 100m, which forced the Indira Gandhi International airport crew to resort to Low Visibility Procedures ( LVP).
The runway visibility
range was reduced to 300 metres, causing officials to divert flights to various places including Jaipur, Ahemdabad and Mumbai.
The procedures will also be divided into four phases depending on runway visibility
and cloud ceiling.
dropped suddenly from 700m to less than 50m on all three runways.
According to Airport officials, though the airport witnessed fog at night and in the morning the runway visibility
was good enough for smooth operations.
ILS allows compliant aircraft and trained pilots to land even when runway visibility
dips to 50m.
Providence airport does not have radar equipment to track the runway movements of aircraft and runway visibility
was apparently minimal due to heavy fog.
"The runway visibility
stood at six kilometers when the incident took place.