Airport Engineering
The size of landing area for multi engine helicopters operating under 1 FR conditions is

22.5 m × 22.5 m
22.5 m × 30 m
60 m × 120 m
30 m × 30 m

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Airport Engineering
The capacity of parallel runway pattern depends upon

Lateral spacing between two runways and navigational aids available
Lateral spacing between two runways and weather conditions
Weather conditions and navigational aids available
Lateral spacing between two runways, weather conditions and navigational aids available.

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