Means This

The center plane of datum feature B Is perpendicular to datum plane A

0.8 wide tolerance zone

0.8 wide tolerance zone

Aircraft Engineering Positional Drawing
Datum plane A

The center plane of the actual mating envelope of the slot must lie between two parallel planes 0.8 apart, equally disposed about the center plane of datum B. The specified tolerance and the datum reference can only apply on an RFS basis.

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