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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Heading track position deviation by air carrier widebody transport when encountering lines of thunderstorm activity.
| Attributes | |
| ACN | 251620 |
| Time | |
| Date | 199309 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : zoa |
| State Reference | CA |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa tower : mia |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other cruise other other |
| Route In Use | enroute : pacific enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 5050 flight time type : 2050 |
| ASRS Report | 251620 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time total : 26000 |
| ASRS Report | 251512 |
| Events | |
| Anomaly | inflight encounter : weather non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified 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 |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
We requested deviation north of track in order to avoid thunderstorms. Hnl radio advised that ZOA said 'unable deviation north, deviation south approved.' due to the southerly extent of the thunderstorms, northward deviation was the only safe way to go. We declared an emergency and deviated approximately 30 NM north of track. After 10 mins, we returned to course. Supplemental information from acn 251512: 'required deviation 10 NM for WX.' 'approved south of track' after 5 min wait (hnl arinc too busy at that hour working flts -- consistent problem). After successfully navigating this line, radar displayed a second line (not painted until after passing first one) requiring an additional 20 NM south. No good to go back. Could not get word in for clearance request account radio traffic. Broadcast on 121.5 position/altitude and intention to 'deviate without clearance' also on 128.95. Did so on emergency basis and advised ZOA via hnl radio when their traffic allowed. Need VHF satellite communication. This is 1993.
Original NASA ASRS Text
Title: HDG TRACK POS DEV BY ACR WDB WHEN ENCOUNTERING LINES OF TSTM ACTIVITY.
Narrative: WE REQUESTED DEV N OF TRACK IN ORDER TO AVOID TSTMS. HNL RADIO ADVISED THAT ZOA SAID 'UNABLE DEV N, DEV S APPROVED.' DUE TO THE SOUTHERLY EXTENT OF THE TSTMS, NORTHWARD DEV WAS THE ONLY SAFE WAY TO GO. WE DECLARED AN EMER AND DEVIATED APPROX 30 NM N OF TRACK. AFTER 10 MINS, WE RETURNED TO COURSE. SUPPLEMENTAL INFO FROM ACN 251512: 'REQUIRED DEV 10 NM FOR WX.' 'APPROVED S OF TRACK' AFTER 5 MIN WAIT (HNL ARINC TOO BUSY AT THAT HR WORKING FLTS -- CONSISTENT PROB). AFTER SUCCESSFULLY NAVING THIS LINE, RADAR DISPLAYED A SECOND LINE (NOT PAINTED UNTIL AFTER PASSING FIRST ONE) REQUIRING AN ADDITIONAL 20 NM S. NO GOOD TO GO BACK. COULD NOT GET WORD IN FOR CLRNC REQUEST ACCOUNT RADIO TFC. BROADCAST ON 121.5 POS/ALT AND INTENTION TO 'DEVIATE WITHOUT CLRNC' ALSO ON 128.95. DID SO ON EMER BASIS AND ADVISED ZOA VIA HNL RADIO WHEN THEIR TFC ALLOWED. NEED VHF SATELLITE COM. THIS IS 1993.
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.