 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An air carrier B757 flight crew attempted to get permission via HF radio to deviate around thunderstorms. After waiting a short time, the flight crew broadcast on VHF frequencys that they were deviating using the captain's command authority/authorized. They returned to course a few mins later.
| Attributes | |
| ACN | 373799 |
| Time | |
| Date | 199707 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : kbv |
| State Reference | FO |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : atlantic enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 373799 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
Narrative:
We were northbound on A300-sju-ewr at FL350. At approximately XA08Z we requested a deviation 20 NM west of course to avoid thunderstorms on the route in the vicinity of navigation position lacki. We made this call on the primary HF frequency for ZNY and then were told to stand by for clearance. After 10 mins we received no cell call or radio transmission on the primary frequency. We began the deviation west of course due to thunderstorm clouds which went up to at least FL400, associated with tropical storm ana. I made calls in the blind on both 130.55, caribbean route common, and 121.50, identing our position/altitude and deviation. I made 4 calls in total on these frequencys, and we also monitored the TCASII. After the deviation we returned to course by about XA26Z. Our widest deviation was 20 NM west. Our requested clearance via HF radio was never granted. I used my emergency authority/authorized due to the adverse WX on our intended route of flight.
Original NASA ASRS Text
Title: AN ACR B757 FLC ATTEMPTED TO GET PERMISSION VIA HF RADIO TO DEVIATE AROUND TSTMS. AFTER WAITING A SHORT TIME, THE FLC BROADCAST ON VHF FREQS THAT THEY WERE DEVIATING USING THE CAPT'S COMMAND AUTH. THEY RETURNED TO COURSE A FEW MINS LATER.
Narrative: WE WERE NBOUND ON A300-SJU-EWR AT FL350. AT APPROX XA08Z WE REQUESTED A DEV 20 NM W OF COURSE TO AVOID TSTMS ON THE RTE IN THE VICINITY OF NAV POS LACKI. WE MADE THIS CALL ON THE PRIMARY HF FREQ FOR ZNY AND THEN WERE TOLD TO STAND BY FOR CLRNC. AFTER 10 MINS WE RECEIVED NO CELL CALL OR RADIO XMISSION ON THE PRIMARY FREQ. WE BEGAN THE DEV W OF COURSE DUE TO TSTM CLOUDS WHICH WENT UP TO AT LEAST FL400, ASSOCIATED WITH TROPICAL STORM ANA. I MADE CALLS IN THE BLIND ON BOTH 130.55, CARIBBEAN RTE COMMON, AND 121.50, IDENTING OUR POS/ALT AND DEV. I MADE 4 CALLS IN TOTAL ON THESE FREQS, AND WE ALSO MONITORED THE TCASII. AFTER THE DEV WE RETURNED TO COURSE BY ABOUT XA26Z. OUR WIDEST DEV WAS 20 NM W. OUR REQUESTED CLRNC VIA HF RADIO WAS NEVER GRANTED. I USED MY EMER AUTH DUE TO THE ADVERSE WX ON OUR INTENDED RTE OF FLT.
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.