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The formula: RVR = HAT/tg x - L RVR is the resultant of the formula, namely X + Y, because HAT/tgx = X + Y + L Hence RVR = X + Y, not only Y. Hence X is an additional Visual segment, apart from the difference of the ICAO maximum approach light length and the e.g. 720 m.
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The formula: RVR = HAT/tg x - L RVR is the resultant of the formula, namely X + Y, because HAT/tgx = X + Y + L Hence RVR = X + Y, not only Y. Hence X is an additional Visual segment, apart from the difference of the ICAO maximum approach light length and the e.g. 720 m. The pilot can see over a distance X + Y. RVR = X + Y HAT Total Visual segment 15 m Y L = 720 m X (HAT-15)/tg x HAT/tg x