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King air 90 pilot reported deviating without clearance for a thunderstorm that suddenly appeared on the nose during transition from IMC to VMC. Xm weather and the aircraft radar did not show the buildup.
| Attributes | |
| ACN | 1465594 |
| Time | |
| Date | 201707 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | King Air C90 E90 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Weather Radar |
| Person 1 | |
| Function | Single Pilot |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 35 Flight Crew Total 2700 Flight Crew Type 80 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
The event occurred during cruise on a medical transport. Flight conditions were in and out small storm buildups and intermittent IMC/VMC. Upon exiting an area of IMC a very large buildup/thunderstorm appeared in front of me in very close proximity. I had no time available to request deviation from my course to avoid the hazard. I immediately turned approximately 30 degrees right of course to avoid the possible storm cell.contributing to this was the xm weather and radar did not accurately depict what I was about to fly into. Had I selected a different altitude I may have been able to see and avoid the area much earlier. My inaction created a situation where I had to deviate from my assigned route.
Original NASA ASRS Text
Title: King Air 90 pilot reported deviating without clearance for a thunderstorm that suddenly appeared on the nose during transition from IMC to VMC. XM weather and the aircraft radar did not show the buildup.
Narrative: The event occurred during cruise on a medical transport. Flight conditions were in and out small storm buildups and intermittent IMC/VMC. Upon exiting an area of IMC a very large buildup/thunderstorm appeared in front of me in very close proximity. I had no time available to request deviation from my course to avoid the hazard. I immediately turned approximately 30 degrees right of course to avoid the possible storm cell.Contributing to this was the XM weather and radar did not accurately depict what I was about to fly into. Had I selected a different altitude I may have been able to see and avoid the area much earlier. My inaction created a situation where I had to deviate from my assigned route.
Data retrieved from NASA's ASRS site 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.