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C is the clearance between the outer main gear wheel and the taxiway edge (maximum allowable lateral deviation), and Z = safety margin distance (for example, 10.5 m and 13 m for aircraft Codes E and F, respectively). Separation Distance between a Taxilane and an Object For the clearance distance required on an aircraft taxilane, the safety margins are reduced due to the slow taxiing speed of aircraft and the availability of a visual docking guidance system or a marshaller to accurately guide the aircraft. The condition is illustrated in Figure 8. Therefore, for Code E aircraft opera- tions, the C value was reduced to 8 ft (2.5 m) and the safety buffer (Z) was reduced to 25 ft (7.5 m). The formula is the same as the formula for the distance between a taxiway and an object. where STXL-OBJ is the separation distance between the taxilane centerline and an object. In the case of Code F aircraft, again the 1.6-ft (0.5-m) increase in the Z value was engineering judgment to account for the larger wingspan aircraft. For taxiways and taxilanes, the same document establishes that the minimum separation distance is equal to the wingspan plus max lateral deviation plus increment. ICAO Annex 14â Aerodromes (2006b) contains the standards and recommended practices on airport separations. S WS C ZTXL-OBJ = + + 2 11 Figure 7. Taxiway/apron taxiway-to-object geometry. Figure 8. Aircraft stand taxilane-to-object geometry.