A runway length corrected for elevation and temperature is 2845 m. With an effective gradient of 0.5%, what is the revised runway length_________________?
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Answer: C. 3030 m
Explanation
Gradient correction increases runway length by twenty percent for every one percent of effective gradient. Multiplying zero point five percent gradient by twenty percent gives a ten percent length increase. Adding ten percent to twenty-eight hundred forty-five meters results in thirty-and-thirty meters. Effective gradient is the maximum difference in elevation divided by total runway length. Sloping runways require extra length because gravity hinders aircraft acceleration during takeoff. Elevation and temperature corrected lengths must be further adjusted for longitudinal gradients.
Airport designers apply gradient corrections last after adjusting for elevation and temperature. Accurate runway sizing ensures aircraft can achieve takeoff speed safely on sloping terrain. Civil engineering projects verify all geometric corrections before constructing airfield pavements. Twenty-eight hundred forty-five meters fails to apply the necessary gradient correction factor. Twenty-nine hundred ten meters underestimates the required increase for a zero point five percent slope. Thirty-one hundred thirty meters overestimates the correct adjusted length calculation.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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