The formula:
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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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15 m

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


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