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Definition of Approach clearance

Approach clearance Definition from Business & Finance Dictionaries & Glossaries
BTS Transportation Expressions
Authorization by Air Traffic Control (ATC) for a pilot to conduct an instrument approach. The type of instrument approach for which a clearance and other pertinent information is provided in the approach clearance when required. (FAA4)
By the Bureau of Transportation Statistics.
Approach clearance Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
Authorization for a pilot conducting flight in accordance with instrument flight rules to commence an approach to an airport.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )