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B757 flight crew deviates a thunderstorm after attempting to receive clearance from departure controller. Departure controller did not approve the avoidance turn so captain authority/authorized was used.
| Attributes | |
| ACN | 398110 |
| Time | |
| Date | 199803 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | agl bound lower : 0 agl bound upper : 5000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 20000 flight time type : 1000 |
| ASRS Report | 398110 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | inflight encounter : weather non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
We were cleared for takeoff to the east from atl and given an initial heading of 120 degrees. There were thunderstorms to the east of atl to level 5. From the runway, the radar picture looked ok for a 120 degree heading. After takeoff, however, it did not. I instructed the first officer to request an immediate turn to 180 degrees to avoid a thunderstorm on the radar. Departure control did not approve it immediately and some discussion ensued between the first officer and departure control. I started a turn to 180 degrees and instructed my first officer to tell departure control we were turning to 180 degrees to avoid a thunderstorm. Some other discussion ensued between my first officer and departure control. After rolling out on 180 degrees, departure very pointedly asked us what we were doing on that heading. I replied we were avoiding flying into a thunderstorm. He had some comments to make, but finally seemed to agree we were within our rights. ATC should be reinformed that the pilots are in the best position to assess the WX and take appropriate evasive action to avoid flying through thunderstorms at all costs.
Original NASA ASRS Text
Title: B757 FLC DEVIATES A TSTM AFTER ATTEMPTING TO RECEIVE CLRNC FROM DEP CTLR. DEP CTLR DID NOT APPROVE THE AVOIDANCE TURN SO CAPT AUTH WAS USED.
Narrative: WE WERE CLRED FOR TKOF TO THE E FROM ATL AND GIVEN AN INITIAL HDG OF 120 DEGS. THERE WERE TSTMS TO THE E OF ATL TO LEVEL 5. FROM THE RWY, THE RADAR PICTURE LOOKED OK FOR A 120 DEG HDG. AFTER TKOF, HOWEVER, IT DID NOT. I INSTRUCTED THE FO TO REQUEST AN IMMEDIATE TURN TO 180 DEGS TO AVOID A TSTM ON THE RADAR. DEP CTL DID NOT APPROVE IT IMMEDIATELY AND SOME DISCUSSION ENSUED BTWN THE FO AND DEP CTL. I STARTED A TURN TO 180 DEGS AND INSTRUCTED MY FO TO TELL DEP CTL WE WERE TURNING TO 180 DEGS TO AVOID A TSTM. SOME OTHER DISCUSSION ENSUED BTWN MY FO AND DEP CTL. AFTER ROLLING OUT ON 180 DEGS, DEP VERY POINTEDLY ASKED US WHAT WE WERE DOING ON THAT HDG. I REPLIED WE WERE AVOIDING FLYING INTO A TSTM. HE HAD SOME COMMENTS TO MAKE, BUT FINALLY SEEMED TO AGREE WE WERE WITHIN OUR RIGHTS. ATC SHOULD BE REINFORMED THAT THE PLTS ARE IN THE BEST POS TO ASSESS THE WX AND TAKE APPROPRIATE EVASIVE ACTION TO AVOID FLYING THROUGH TSTMS AT ALL COSTS.
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.