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A tbm 850 pilot reported an ahrs (altitude and heading reference system) failure at FL270. The pilot then elected to divert.
| Attributes | |
| ACN | 1458327 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | TBM 700/TBM 850 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | AHRS/ND |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 9000 Flight Crew Type 780 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
In cruise in VMC aircraft ap began to command a left turn into what was an erroneous wind vector that rapidly increased through 200 knots. Ap was disconnected and control was established.shortly after an attitude fail message was displayed on the pfd; followed by a red ahrs (attitude and heading reference system) fail with associated loss of all pitch and roll data along with heading information. After a few minutes the system reset. It then failed again for a couple minutes before again resetting and operating normally for the duration of the diversion to landing.there were no other associated air data or GPS signal failures noted. Aircraft control and safety of flight were not jeopardized. Being day VMC was a significant factor in the outcome of this event. While the electronic backup instrument still had good attitude information it's heading also failed with the pfd. Steam gauge instruments are fully independent and provided good attitude information but being on the far side of the cockpit and not providing GPS navigation they are a poor substitute.systems are garmin G600 pfd and dual garmin GTN700 navigators.
Original NASA ASRS Text
Title: A TBM 850 pilot reported an AHRS (Altitude and Heading Reference System) failure at FL270. The pilot then elected to divert.
Narrative: In cruise in VMC aircraft AP began to command a left turn into what was an erroneous wind vector that rapidly increased through 200 knots. AP was disconnected and control was established.Shortly after an Attitude Fail message was displayed on the PFD; followed by a red AHRS (Attitude and Heading Reference System) FAIL with associated loss of all pitch and roll data along with heading information. After a few minutes the system reset. It then failed again for a couple minutes before again resetting and operating normally for the duration of the diversion to landing.There were no other associated air data or GPS signal failures noted. Aircraft control and safety of flight were not jeopardized. Being day VMC was a significant factor in the outcome of this event. While the electronic backup instrument still had good attitude information it's heading also failed with the PFD. Steam gauge instruments are fully independent and provided good attitude information but being on the far side of the cockpit and not providing GPS navigation they are a poor substitute.Systems are Garmin G600 PFD and dual Garmin GTN700 navigators.
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.