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An air carrier large transport freighter flight crew reports that the RVR went below CAT 1 visibility minimums after they had passed the IAP so the flight crew continued the approach and landed.
| Attributes | |
| ACN | 392820 |
| Time | |
| Date | 199801 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : inn airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7000 flight time type : 2000 |
| ASRS Report | 392820 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | inflight encounter : weather non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approach control cleared us to cross 'bonna' intersection at 4000 ft. 'Bonna' is the initial approach fix for ILS runway 30R at minneapolis-st paul international airport. After crossing 'bonna' we intercepted the GS and began our descent. After starting down, ATC advised us that RVR for runway 30R was 3500 ft. Published minimums for ILS runway 30R are 4000 ft, but because we had started 'down' from IAF crossing altitude, I believe we were legal to continue the approach and did so. I asked other crew members if they agreed that we were legal to continue (when ATC informed us of the 3500 ft RVR) and all agreed that we were.
Original NASA ASRS Text
Title: AN ACR LGT FREIGHTER FLC RPTS THAT THE RVR WENT BELOW CAT 1 VISIBILITY MINIMUMS AFTER THEY HAD PASSED THE IAP SO THE FLC CONTINUED THE APCH AND LANDED.
Narrative: APCH CTL CLRED US TO CROSS 'BONNA' INTXN AT 4000 FT. 'BONNA' IS THE INITIAL APCH FIX FOR ILS RWY 30R AT MINNEAPOLIS-ST PAUL INTL ARPT. AFTER XING 'BONNA' WE INTERCEPTED THE GS AND BEGAN OUR DSCNT. AFTER STARTING DOWN, ATC ADVISED US THAT RVR FOR RWY 30R WAS 3500 FT. PUBLISHED MINIMUMS FOR ILS RWY 30R ARE 4000 FT, BUT BECAUSE WE HAD STARTED 'DOWN' FROM IAF XING ALT, I BELIEVE WE WERE LEGAL TO CONTINUE THE APCH AND DID SO. I ASKED OTHER CREW MEMBERS IF THEY AGREED THAT WE WERE LEGAL TO CONTINUE (WHEN ATC INFORMED US OF THE 3500 FT RVR) AND ALL AGREED THAT WE WERE.
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.