CAPT OF AN MDT CONTINUED AN ILS APCH AFTER HE WAS GIVEN A WX RPT OF BELOW LNDG MINIMUM PRIOR TO REACHING THE FINAL APCH FIX.

Narrative

RVR ON RWYS 26 AND 27 AT IAH WAS GOING UP AND DOWN; 1600- 3000 FT. THERE WAS A NOTAM PUBLISHED FOR THE ILS TO RWY 27 THAT RAISED THE DECISION HT AND VISIBILITY FOR THE APCH. WE ELECTED TO USE RWY 26 BECAUSE OF THIS. ALL OTHER TFC WAS USING RWY 27. NOTAMED MINIMAL VISIBILITY WAS 4000 FT RVR. WE WERE CLRED FOR THE ILS RWY 26 AT IAH AT 4000 FT MSL; AND INTERCEPTED THE LOC AND GS AT THAT ALT. AT 3- 4 MI OUTSIDE THE FAF APCH GAVE NEW VISIBILITY READINGS. RWY 26 WAS PARTIALLY BLOCKED AND NOT UNDERSTOOD. AT 1 MI TO THE MARKER RWY 26 VISIBILITY WAS CALLED AT 1600 FT RVR. WE CONTINUED AND LANDED WITHOUT INCIDENT. IN RECENT TRAINING; I UNDERSTOOD THAT ONCE YOU ARE ESTABLISHED ON THE GS AND LOC THAT YOU ARE ON THE FINAL APCH SEGMENT AND CAN CONTINUE REGARDLESS OF NEW VISIBILITY RPTS. THE FO AND I DISCUSSED IT DURING THE APCH AND HE DID NOT OBJECT. AFTERWARDS HE DID OBJECT AND I DISCUSSED IT FURTHER WITH THE CHIEF PLT. HE AGREED WITH THE FO. I WOULD REALLY LIKE TO DISCUSS THIS WITH ONE OF YOUR INVESTIGATORS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS GIVEN THE REF TO THE RULE THAT APPLIES TO THE REQUIRED PROC TO USE WHEN THE RPTED WX INDICATES BELOW LNDG WX MINIMUMS BEFORE THE OM IS REACHED INBOUND ON THE FINAL APCH SEGMENT. ONLY WHEN THE FINAL APCH FIX IS NOT INDICATED; BUT THE ACFT IS ESTABLISHED ON FINAL INBOUND CAN THE APCH BE CONTINUED IF THE WX IS RPTED AT THAT TIME BELOW MINIMUM. THIS WAS A COMMUTER OPS WITH AN ATR42 TYPE ACFT.