Buttock line (BL) – The longitudinal axis of the aircraft that serves as the reference location for positions to the left and right of center. The positions are usually dimensioned in inches.
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14 CFR 1.1 16G Abbreviation Acronym Aerodynamics Aircraft Airline Airlines Airport Airports Airworthiness AMT ATC Aviation Safety Aviation Weather Avionics Bird Strike Engineering ETOPS FAA FAA Pilot's Handbook Flight Flying Human Factors ICAO Icinig Inspection Instruments International Landing Maintenance Military Navigation NextGen Parts Pilot Technique Powerplant Regulatory Safety Seats Structures Systems Tires UK Weather
