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<br />MM: middle marker <br /> <br />MSL: mean sea level <br /> <br />NA V AID: navigational aid <br /> <br />NDB: non-directional beacon <br /> <br />OM: outer marker <br /> <br />P API: precision approach path indicator <br /> <br />SEL: sound exposure level <br /> <br />SW: runway weight bearing capacity for aircraft with single-wheel type <br />landing gear <br /> <br />TRACON: terminal radar approach control <br /> <br />V ASI: visual approach slope indicator <br /> <br />VFR: visual flight rules (FAR Part 91) <br /> <br />VHF: very high frequency <br /> <br />VOR: very high frequency omnidirectional range <br /> <br />VORTAC: (see VOR and TACAN) <br /> <br />B-7 <br />