Answer :
To determine an ILS runway for the given approach the published visibility for the ils is no lower than 3/4 sm.
What should be the pilot aware of the obstacles?
The pilot should be aware that the obstacle identification surfaces (OIS) may be penetrated if the minimum published visibility for an ILS runway equipped with MALSR is no lower than 3/4 SM, and caution should be exercised in the visual segment to avoid any obstacles.
Visibility for an ILS Runway:
With a CAT I ILS approach supported by a 1,400–3,000-foot–long (430–910 m) ALS, visibility minimums of 12 mile (0.80 km) (runway visual range of 2,400 feet (730 m)) are possible. If the runway has high-intensity edge lights, visibility minimums of 38 miles (600 m) and 1,800–foot (550 m) visual range are also possible.
Hence published visibility for the ils is no lower than 3/4 sm
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