Originally Posted by
747dieseldude
If RVR is reported, it must be used. Controlling is TDZ RVR, unless it is u/s, in which case it may be substituted by MID RVR.
In our table (defective equipment) the quote above is only applicable to Cat2&3. Cat1 states "no effect".
Example 1: TDZ RVR u/s, cat1 installation, RVR required 550 m. RVR midpoint reported 600m.
Q: since the table doesnt explicitly allow midpoint RVR to be substituted for TDZ RVR, can I fly beyond OM?
Ex 2: TDZ RVR u/s, cat1 installation, now vis 600 given and RVR required 900 m, midpoint RVR 400, night, HIALS. Since midpoint IS given but TDZ not, can I convert, MUST I use midpoint for TDZ or???