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B737-800 flight crew requested deviation for thunderstorms on overwater flight. ATC denied the request unless the flight crew declared an emergency.
| Attributes | |
| ACN | 756926 |
| Time | |
| Date | 200709 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zzz.artcc |
| State Reference | FO |
| Altitude | msl single value : 39000 |
| Environment | |
| Flight Conditions | Marginal |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 756926 |
| Events | |
| Anomaly | inflight encounter : weather |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : took precautionary avoidance action |
| Supplementary | |
| Problem Areas | FAA Weather ATC Human Performance |
| Primary Problem | Weather |
Narrative:
There were storms south and at zzzzz intersection. We asked for right deviation 30 mi 85 before zzzzzz and were told by ATC they could not give us that. We then asked for runways xxl and xyr and that was turned down also. They told us there was no traffic and to declare captain's emergency authority/authorized if we needed to deviate. We did and deviated right 10 mi and we were back on course 10 mi east of zzzzzz. The storms were probably 43000 ft tall and we were at FL390. No problems with traffic.
Original NASA ASRS Text
Title: B737-800 FLT CREW REQUESTED DEVIATION FOR TSTMS ON OVERWATER FLT. ATC DENIED THE REQUEST UNLESS THE FLT CREW DECLARED AN EMER.
Narrative: THERE WERE STORMS S AND AT ZZZZZ INTXN. WE ASKED FOR R DEV 30 MI 85 BEFORE ZZZZZZ AND WERE TOLD BY ATC THEY COULD NOT GIVE US THAT. WE THEN ASKED FOR RWYS XXL AND XYR AND THAT WAS TURNED DOWN ALSO. THEY TOLD US THERE WAS NO TFC AND TO DECLARE CAPT'S EMER AUTH IF WE NEEDED TO DEVIATE. WE DID AND DEVIATED R 10 MI AND WE WERE BACK ON COURSE 10 MI E OF ZZZZZZ. THE STORMS WERE PROBABLY 43000 FT TALL AND WE WERE AT FL390. NO PROBS WITH TFC.
Data retrieved from NASA's ASRS site as of January 2009 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.