The final segment CAT speed is based on Vref. So for a CAT C aircraft, speed in the final approach segment can range from 140 to 164 kts IAS.
Other segments have minimum speeds as well per CAT..
To calc RVR:
rho=log(I=ET ) 2 log/RVR
MOR =log(0:05)RVRlog(I=ET ) 2 logRVR equals 3RVRlog(I=ET ) 2 logRVR
- Calculate MOR550 corresponding to RVR = 550m using the intensity of the
edge lights.
- Calculate MOR200 corresponding to RVR = 200m using the intensity of the
centre line lights.
- Using Koschmeider’s Law, calculate the actual MOR.
- Compute such that MOR = MOR550 + (1 )MOR200. Then the …nal
value of RVR = 200 + 350 . 