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PA46 pilot reported after a uav encounter the pfd in the aircraft produced a large navigational error. The reporter suspects GPS jamming.
| Attributes | |
| ACN | 1696794 |
| Time | |
| Date | 201910 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZLA.ARTCC |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PA-46 Malibu/Malibu Mirage/Malibu Matrix |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | UAV - Unpiloted Aerial Vehicle |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | PFD |
| Person 1 | |
| Function | Single Pilot Pilot Flying |
| Qualification | Flight Crew Private Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 41 Flight Crew Total 2714 Flight Crew Type 429 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Conflict Airborne Conflict Deviation - Procedural Published Material / Policy |
Narrative:
In route to myf on an IFR flight plan in VMC; I saw a DOD drone (inverted V tail) pass overhead approximately 1;000 [feet] above. At the same time; my garmin G3000 pfd indicated that I had a large magnetic variation error; and in turn the pfd indicated that I was now flying to a new way point (tch VOR) located in utah; well off my flight plan between northern and southern california. Later and second way point in montana was introduced. The mfd still showed the original flight plan; but the pfd was in conflict; which resulted in a loss of ability to fly an instrument approach of any kind; and loss of synthetic vision within the pfd. Had it not been a VMC day allowing me to fly a visual approach; I would have had to [advise ATC] - and find a way to land without any reliable approach capability.the system has since been checked and is operating correctly; but it seems pretty clear this was some type of interference / jamming arising from the DOD drone. Clearly; this is a significant risk to all aircraft; and because if occurred within the la airspace it is a serious threat to safe flights
Original NASA ASRS Text
Title: PA46 pilot reported after a UAV encounter the PFD in the aircraft produced a large navigational error. The reporter suspects GPS jamming.
Narrative: In route to MYF on an IFR flight plan in VMC; I saw a DOD drone (inverted V tail) pass overhead approximately 1;000 [feet] above. At the same time; my Garmin G3000 PFD indicated that I had a large magnetic variation error; and in turn the PFD indicated that I was now flying to a new way point (TCH VOR) located in Utah; well off my flight plan between Northern and Southern California. Later and second way point in Montana was introduced. The MFD still showed the original flight plan; but the PFD was in conflict; which resulted in a loss of ability to fly an instrument approach of any kind; and loss of synthetic vision within the PFD. Had it not been a VMC day allowing me to fly a visual approach; I would have had to [advise ATC] - and find a way to land without any reliable approach capability.The system has since been checked and is operating correctly; but it seems pretty clear this was some type of interference / jamming arising from the DOD drone. Clearly; this is a significant risk to all aircraft; and because if occurred within the LA airspace it is a serious threat to safe flights
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.