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The MDP is a reference or starting point used in manufacturing new airframes. Like weight and balance or CG point of reference.
Let me know if I am on the correct track with this answer please.
Thank you.
Are you sure that MPD is "Manufecturer's Datum Point"? Perhaps it refers to the Maintenance "Planing Document", which is a document that is part of the airworthiness certification process.
It is a point on or about an aircraft (when it is being built) from which all measurements are taken.