Narrative:

During ILS approach to runway 22L bos, ATIS was reporting marginal 900 ft overcast 2 1/2 mi. Localizer intercept outside IAF we then got involved with separation from the flight ahead of us which we had both on TCASII showing 4 mi and visually. Given that maintenance unit readings in the 30's were being reported and that we appeared to be gaining slightly we opted to reduce to 140 KTS. This involved getting the gear down and the flaps to 25 degrees. While we were in the middle of this process, I thought I heard a report of 2000 ft RVR being issued to someone else but it did not register at the time because of all the activity in the cockpit, mainly interpreting the TCASII changing confign and reducing airspeed. To the best of my recollection we had begun the final segment of the approach when I heard the RVR report but there is an element of doubt in my mind thus the reason for this report. We saw the runway at 450 AGL and landed without incident.

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Original NASA ASRS Text

Title: B-757 PIC PONDERS ON THE LEGALITY OF HIS IAP ILS WHEN RVR ANNOUNCED INDICATING LESS THAN REQUIRED FOR ARPT WX MINIMUMS FOR LNDG.

Narrative: DURING ILS APCH TO RWY 22L BOS, ATIS WAS RPTING MARGINAL 900 FT OVCST 2 1/2 MI. LOC INTERCEPT OUTSIDE IAF WE THEN GOT INVOLVED WITH SEPARATION FROM THE FLT AHEAD OF US WHICH WE HAD BOTH ON TCASII SHOWING 4 MI AND VISUALLY. GIVEN THAT MAINT UNIT READINGS IN THE 30'S WERE BEING RPTED AND THAT WE APPEARED TO BE GAINING SLIGHTLY WE OPTED TO REDUCE TO 140 KTS. THIS INVOLVED GETTING THE GEAR DOWN AND THE FLAPS TO 25 DEGS. WHILE WE WERE IN THE MIDDLE OF THIS PROCESS, I THOUGHT I HEARD A RPT OF 2000 FT RVR BEING ISSUED TO SOMEONE ELSE BUT IT DID NOT REGISTER AT THE TIME BECAUSE OF ALL THE ACTIVITY IN THE COCKPIT, MAINLY INTERPRETING THE TCASII CHANGING CONFIGN AND REDUCING AIRSPD. TO THE BEST OF MY RECOLLECTION WE HAD BEGUN THE FINAL SEGMENT OF THE APCH WHEN I HEARD THE RVR RPT BUT THERE IS AN ELEMENT OF DOUBT IN MY MIND THUS THE REASON FOR THIS RPT. WE SAW THE RWY AT 450 AGL AND LANDED WITHOUT INCIDENT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.