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Citation flight crew experiences moderate to severe turbulence at FL180 for 15 seconds that apparently causes both garmins to shut down. This eliminates both navigation and communication and will not reset. The crew elects to remain VFR; squawk 7600; and divert to a suitable airport. When the aircraft is powered back up for trouble-shooting the garmins work normally.
| Attributes | |
| ACN | 1264175 |
| Time | |
| Date | 201505 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZHU.ARTCC |
| State Reference | TX |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation I (C500) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | VHF |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Flight Engineer Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 77.4 Flight Crew Total 29000 Flight Crew Type 600 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 60 Flight Crew Total 20000 Flight Crew Type 1200 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
This flight was to hyi (san marcos; tx); IFR and occurred at approximately 30 minutes into this 45 minute flight to hyi. The time of this is approximate. We were level at FL180 deviating around storm cells in IMC. We encountered moderate to severe turbulence for about 15 seconds and lost all navigation and radios. Our only communication with center was the transponder that was still working. Unable to get the navigation or radios back in operation we squawked 7600. We broke out into clear weather and decided to descend in VMC down to 3000 feet and look for a suitable airport. We landed at [an airport] and called center by phone.after shutting down the engines and then turning the battery switch back on to trouble shoot this problem all navigation and radios came back on and operated normal.we did a preflight and departed VFR; called center for VFR flight following to san marcos (hyi).
Original NASA ASRS Text
Title: Citation flight crew experiences moderate to severe turbulence at FL180 for 15 seconds that apparently causes both Garmins to shut down. This eliminates both Navigation and Communication and will not reset. The crew elects to remain VFR; squawk 7600; and divert to a suitable airport. When the aircraft is powered back up for trouble-shooting the Garmins work normally.
Narrative: This flight was to HYI (San Marcos; TX); IFR and occurred at approximately 30 minutes into this 45 minute flight to HYI. The time of this is approximate. We were level at FL180 deviating around storm cells in IMC. We encountered moderate to severe turbulence for about 15 seconds and lost all navigation and radios. Our only communication with Center was the transponder that was still working. Unable to get the navigation or radios back in operation we squawked 7600. We broke out into clear weather and decided to descend in VMC down to 3000 feet and look for a suitable airport. We landed at [an airport] and called Center by phone.After shutting down the engines and then turning the Battery Switch back on to trouble shoot this problem all navigation and radios came back on and operated normal.We did a preflight and departed VFR; called Center for VFR flight following to San Marcos (HYI).
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.