For the taxiways, the following statement is true A. The maximum longitudinal grade is 3% B. The permissible rate of change of grade is 1% C. The permissible transverse grade is 1.5% D. All the above

The correct answer is D. All of the above.

The maximum longitudinal grade of a taxiway is 3%, which means that for every 100 feet of taxiway, the elevation should change by 3 feet. The permissible rate of change of grade is 1%, which means that the grade of the taxiway should not change more than 1% in any 100 feet. The permissible transverse grade of a taxiway is 1.5%, which means that the side-to-side slope of the taxiway should not exceed 1.5%.

These requirements are in place to ensure that aircraft can taxi safely and efficiently on the taxiway. The maximum longitudinal grade is limited to 3% to prevent aircraft from rolling backwards when they

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