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Both of a LR45's ahrs failed climbing out of FL310 but were recovered after the ahrs 1 and 2 ahrs circuit breakers were reset.
| Attributes | |
| ACN | 1015752 |
| Time | |
| Date | 201206 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZNY.ARTCC |
| State Reference | NY |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Learjet 45 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | AHRS/ND |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 140 Flight Crew Total 10000 Flight Crew Type 3500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
On climb out of FL310 'heading 1 fail' appeared on the pilot's primary flight display and heading 2 fail on the copilot's primary flight display. We had no heading information on pilot and copilot side and lost all navigation display from the FMS and VOR. We were not able to bring up VOR navigation display on the rmu. The autopilot remained engaged in roll mode. We pulled and reset the ahrs 1 and 2 circuit breakers and within a few minutes regained heading and navigation display on both sides. With failure of both heading sources; we also lost all navigation display on the pfd's and mfd as well as the rmu's. Glad we were not climbing out of the mountains in IMC when this happened.
Original NASA ASRS Text
Title: Both of a LR45's AHRS failed climbing out of FL310 but were recovered after the AHRS 1 and 2 AHRS circuit breakers were reset.
Narrative: On climb out of FL310 'Heading 1 Fail' appeared on the pilot's Primary Flight Display and Heading 2 Fail on the copilot's Primary Flight Display. We had no heading information on pilot and copilot side and lost all navigation display from the FMS and VOR. We were not able to bring up VOR NAV display on the RMU. The autopilot remained engaged in ROLL mode. We pulled and reset the AHRS 1 and 2 circuit breakers and within a few minutes regained heading and navigation display on both sides. With failure of both heading sources; we also lost all navigation display on the PFD's and MFD as well as the RMU's. Glad we were not climbing out of the mountains in IMC when this happened.
Data retrieved from NASA's ASRS site as of July 2013 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.