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Emergency declared by flight crew of B747-400 in an overwater operation in foreign airspace. Thunderstorm activity required heading track deviation. Unable ATC approval account time constraints.
| Attributes | |
| ACN | 344592 |
| Time | |
| Date | 199608 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rorg |
| State Reference | FO |
| Altitude | msl bound lower : 38000 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : rorg |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other cruise other other |
| Route In Use | enroute : other oceanic enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain other personnel other |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 20000 flight time type : 1900 |
| ASRS Report | 344592 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 15000 flight time type : 2000 |
| ASRS Report | 344589 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approaching 'boney' intersection en route to hkg from sfo, flight requested to deviate off course 40 NM for level 4 thunderstorm. A timely response from naha control was not received. We followed fom guidance on WX deviation. We declared WX deviation emergency, broadcast in blind on 121.5, set code 7700, descended 1000 ft, monitored TCASII, turned on all exterior lights and flew 50 NM north of boney to circumnav thunderstorm. Once clear, proceeded direct hnc, reacquired tpe control and climbed back to FL390 on course.
Original NASA ASRS Text
Title: EMER DECLARED BY FLC OF B747-400 IN AN OVERWATER OP IN FOREIGN AIRSPACE. TSTM ACTIVITY REQUIRED HDG TRACK DEV. UNABLE ATC APPROVAL ACCOUNT TIME CONSTRAINTS.
Narrative: APCHING 'BONEY' INTXN ENRTE TO HKG FROM SFO, FLT REQUESTED TO DEVIATE OFF COURSE 40 NM FOR LEVEL 4 TSTM. A TIMELY RESPONSE FROM NAHA CTL WAS NOT RECEIVED. WE FOLLOWED FOM GUIDANCE ON WX DEV. WE DECLARED WX DEV EMER, BROADCAST IN BLIND ON 121.5, SET CODE 7700, DSNDED 1000 FT, MONITORED TCASII, TURNED ON ALL EXTERIOR LIGHTS AND FLEW 50 NM N OF BONEY TO CIRCUMNAV TSTM. ONCE CLR, PROCEEDED DIRECT HNC, REACQUIRED TPE CTL AND CLBED BACK TO FL390 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.