Question: The oisSurfaceCondition attribute seems inappropriate for Obstruction Identification Surfaces. Should I populate it? And if so, with what value?

Answer: The oisSurfaceCondition attribute is relevant for Obstruction Areas, but not Obstruction Identification Surfaces. A correction will be made in the next release of AC 150/5300-18b.

In the meantime, populate this attribute as “PRIMARY” for all ObstructionIdentificationSurfaces.

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