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While en route on an IFR flight plan, pilot deviates from assigned altitude to circumnav thunderstorms without clearance from ATC.
| Attributes | |
| ACN | 274510 |
| Time | |
| Date | 199406 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : tal |
| State Reference | AK |
| Altitude | msl bound lower : 6000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : v531 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 85 flight time total : 1000 flight time type : 85 |
| ASRS Report | 274510 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| 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 none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
While cruising at 8000 ft on an IFR flight plan not in radio contact and probably not in radar contact with ATC, encountered cumulus buildups with bases at 6500-7000 ft. Tried center to request lower to remain visual. No response. Flew through one buildup experiencing moderate turbulence and moderate rain. Could not raise center. Descended to 6000 ft to remain visual and deviated around next group. Continued to call center and fairbanks radio to inform them of altitude and deviation. Took 10 plus mins to reestablish communication. Center asked for deviation reason and I informed them due to WX.
Original NASA ASRS Text
Title: WHILE ENRTE ON AN IFR FLT PLAN, PLT DEVIATES FROM ASSIGNED ALT TO CIRCUMNAV TSTMS WITHOUT CLRNC FROM ATC.
Narrative: WHILE CRUISING AT 8000 FT ON AN IFR FLT PLAN NOT IN RADIO CONTACT AND PROBABLY NOT IN RADAR CONTACT WITH ATC, ENCOUNTERED CUMULUS BUILDUPS WITH BASES AT 6500-7000 FT. TRIED CTR TO REQUEST LOWER TO REMAIN VISUAL. NO RESPONSE. FLEW THROUGH ONE BUILDUP EXPERIENCING MODERATE TURB AND MODERATE RAIN. COULD NOT RAISE CTR. DSNDED TO 6000 FT TO REMAIN VISUAL AND DEVIATED AROUND NEXT GROUP. CONTINUED TO CALL CTR AND FAIRBANKS RADIO TO INFORM THEM OF ALT AND DEV. TOOK 10 PLUS MINS TO REESTABLISH COM. CTR ASKED FOR DEV REASON AND I INFORMED THEM DUE TO WX.
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.