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AC 150/5300-4B 6/24/75 <br />a. Certain standards are expressed as a maximum and a minimum, such as <br />the standard for the transverse grade of the runway safety area. <br />This range reflects a standard adequate for surface drainage but <br />not in excess of reasonable requirements for efficient and safe <br />airplane operation. <br />b. As most airport sites are not ideal, there are cases that require <br />deviation from a standard which is justifiable in view of other <br />advantages of a site. Where adherence to the recommended dimen- <br />sional standards is impractical, the engineer must justify his <br />decision to deviate. For example, where the direct adherence to <br />the separation between two airport components is considered <br />impractical, it will normally be so because of the combination of <br />physical area limitations and the cost of overcoming the limita- <br />tions. The justification for deviation must be balanced against <br />the effect it would have on the use of the airport and comparisons <br />to other advantages of the site. <br />c. The standards in Figure 7-1 are also applicable to general aviation <br />runways and taxiways provided especially for small general aviation <br />airplanes at air carrier airports. However, regard must be given <br />to lateral clearances from air carrier operational facilities. <br />Page 32 <br />Chap 7 <br />Par 33 <br />