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Ce-560XL captain reported a failure of the ahrs and the inadequacy of the checklist while addressing this issue.
| Attributes | |
| ACN | 1519662 |
| Time | |
| Date | 201802 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flight Dynamics |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Crew experienced an ahrs 1 failure confirmed by autopilot failing; heading (heading) failure in pfd 1; mfd and in the scratch pad of FMS. And attitude (att) failure on pfd 1 and FMS scratch pad. Pilot flying transferred controls to non-flying pilot as well as radios; while checklist was retrieved.the checklist was retrieved and run to completion but finding the actual failure (AHRS1) took longer than expected searching and thusly required systems knowledge to individually isolate the heading portion and then the att portions for reversion. There was no one item for loss of heading and attitude information (ahrs). The crew communicated with ATC regarding aircraft being non rvsm compliant and coordinated lower altitude. Flight continued without incident. There were no deviations; nor further information or telephone exchanged.the addition of a joint failure of heading and att (ahrs) would have made sense rather than separated items. The newer checklist felt fractured in this particular instance.
Original NASA ASRS Text
Title: CE-560XL Captain reported a failure of the AHRS and the inadequacy of the checklist while addressing this issue.
Narrative: Crew experienced an AHRS 1 failure confirmed by autopilot failing; Heading (HDG) failure in PFD 1; MFD and in the scratch pad of FMS. And Attitude (ATT) failure on PFD 1 and FMS scratch pad. Pilot flying transferred controls to non-flying pilot as well as radios; while checklist was retrieved.The checklist was retrieved and run to completion but finding the actual failure (AHRS1) took longer than expected searching and thusly required systems knowledge to individually isolate the HDG portion and then the ATT portions for reversion. There was no one item for loss of heading and attitude information (AHRS). The crew communicated with ATC regarding aircraft being Non RVSM compliant and coordinated lower altitude. Flight continued without incident. There were no deviations; nor further information or telephone exchanged.The addition of a joint failure of HDG AND ATT (AHRS) would have made sense rather than separated items. The newer checklist felt fractured in this particular instance.
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.