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Pilot reports a sudden EFIS system instrument malfunction in a hawker-siddeley hs-125 aircraft; caused the autopilot to dive then climb abruptly to FL350 from FL340 before crew could recover. EFIS displays rolled down; then up; then started to spin with no direction or orientation. Crew used basic gauges to take control until EFIS system reset.
| Attributes | |
| ACN | 1105692 |
| Time | |
| Date | 201307 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | HS 125 Series |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | PFD |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 70 Flight Crew Total 9000 Flight Crew Type 725 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Other / Unknown |
Narrative:
We had a sudden instrument malfunction which caused the autopilot to dive; then climb abruptly to FL350 before we could recover and return the aircraft to FL340. Center understood and confirmed it was not a problem. They asked us if we would be able to maintain FL340 of which we replied yes; and we had no further problem or deviation. Our EFIS displays rolled down; then up; then started to spin with no direction or orientation. We used basic gauges to take control of aircraft until the EFIS system reset and [were] reliable. There were no further problems. I reported this to the avionics shop.
Original NASA ASRS Text
Title: Pilot reports a sudden EFIS System instrument malfunction in a Hawker-Siddeley HS-125 aircraft; caused the autopilot to dive then climb abruptly to FL350 from FL340 before crew could recover. EFIS displays rolled down; then up; then started to spin with no direction or orientation. Crew used basic gauges to take control until EFIS System reset.
Narrative: We had a sudden instrument malfunction which caused the Autopilot to dive; then climb abruptly to FL350 before we could recover and return the aircraft to FL340. Center understood and confirmed it was not a problem. They asked us if we would be able to maintain FL340 of which we replied yes; and we had no further problem or deviation. Our EFIS displays rolled down; then up; then started to spin with no direction or orientation. We used basic gauges to take control of aircraft until the EFIS System reset and [were] reliable. There were no further problems. I reported this to the Avionics Shop.
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.