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Air carrier medium large transport flight crew performs unauthorized takeoff procedure below airport WX mins for takeoff.
| Attributes | |
| ACN | 200653 |
| Time | |
| Date | 199201 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iad |
| State Reference | VA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff ground : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 6800 |
| ASRS Report | 200653 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 400 |
| ASRS Report | 200524 |
| Events | |
| Anomaly | non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At iad, runway 30, in position for takeoff. Tower advises that the tower visibility is decreasing to 1/8 mi and then clears us for takeoff and to turn right to 340 degree as soon as possible. Another aircraft then asked for the RVR and was told 4000 ft. As I pushed the throttles up, I noted that I could see almost the entire length of runway 30. Shortly after takeoff, I checked the 10-9 page and discovered that there was no RVR reports available for runway 30. With the tower reporting visibility decreasing to 1/8, we had actually taken off below our takeoff min of 1/4 mi. I should have requested a delay on the runway or taxied off to check takeoff minima section and not just assumed the 4000 ft RVR report was for runway 30. I was also not alerted to the possibility of it being below takeoff mins because the visibility was so much better where I sat on runway 30 than what the tower was reporting.
Original NASA ASRS Text
Title: ACR MLG FLC PERFORMS UNAUTH TKOF PROC BELOW ARPT WX MINS FOR TKOF.
Narrative: AT IAD, RWY 30, IN POS FOR TKOF. TWR ADVISES THAT THE TWR VISIBILITY IS DECREASING TO 1/8 MI AND THEN CLRS US FOR TKOF AND TO TURN R TO 340 DEG AS SOON AS POSSIBLE. ANOTHER ACFT THEN ASKED FOR THE RVR AND WAS TOLD 4000 FT. AS I PUSHED THE THROTTLES UP, I NOTED THAT I COULD SEE ALMOST THE ENTIRE LENGTH OF RWY 30. SHORTLY AFTER TKOF, I CHKED THE 10-9 PAGE AND DISCOVERED THAT THERE WAS NO RVR RPTS AVAILABLE FOR RWY 30. WITH THE TWR RPTING VISIBILITY DECREASING TO 1/8, WE HAD ACTUALLY TAKEN OFF BELOW OUR TKOF MIN OF 1/4 MI. I SHOULD HAVE REQUESTED A DELAY ON THE RWY OR TAXIED OFF TO CHK TKOF MINIMA SECTION AND NOT JUST ASSUMED THE 4000 FT RVR RPT WAS FOR RWY 30. I WAS ALSO NOT ALERTED TO THE POSSIBILITY OF IT BEING BELOW TKOF MINS BECAUSE THE VISIBILITY WAS SO MUCH BETTER WHERE I SAT ON RWY 30 THAN WHAT THE TWR WAS RPTING.
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.