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Captain of a B757 exercised emergency authority/authorized to deviate around a line of thunderstorms since ATC could not provide a heading to clear the WX due to traffic.
| Attributes | |
| ACN | 445651 |
| Time | |
| Date | 199908 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iad.airport |
| State Reference | VA |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 445651 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | inflight encounter : weather non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : wx radar other flight crewa |
| Resolutory Action | flight crew : declared emergency |
| Consequence | Other |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance Weather |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Thunderstorms in area washington. Departure on 120.65 asked us to turn into a line of thunderstorms northwest of iad. Told ATC we would need a deviation to the south for approximately 35 mi due to a line of thunderstorms. ATC would not let us turn away from the storms. We asked ATC for the deviation 3 times and they still would not let us deviate. Exercised emergency authority/authorized to keep out of the line of thunderstorms. Deviated to the south for approximately 35 mi and then turned back on course.
Original NASA ASRS Text
Title: CAPT OF A B757 EXERCISED EMER AUTH TO DEVIATE AROUND A LINE OF TSTMS SINCE ATC COULD NOT PROVIDE A HEADING TO CLR THE WX DUE TO TFC.
Narrative: TSTMS IN AREA WASHINGTON. DEP ON 120.65 ASKED US TO TURN INTO A LINE OF TSTMS NW OF IAD. TOLD ATC WE WOULD NEED A DEV TO THE S FOR APPROX 35 MI DUE TO A LINE OF TSTMS. ATC WOULD NOT LET US TURN AWAY FROM THE STORMS. WE ASKED ATC FOR THE DEV 3 TIMES AND THEY STILL WOULD NOT LET US DEVIATE. EXERCISED EMER AUTH TO KEEP OUT OF THE LINE OF TSTMS. DEVIATED TO THE S FOR APPROX 35 MI AND THEN TURNED BACK ON COURSE.
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.