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C525 flight crew reported failing to properly set 29.92 upon passing the transition altitude. Contributing factor was that the aircraft was configured for single-pilot operation. Since the altimeters were synced due to the single-pilot set up; both altimeters returned to the local altimeter setting after the copilot pushed the standard baro knob.
| Attributes | |
| ACN | 1398213 |
| Time | |
| Date | 201610 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citationjet (C525/C526) - CJ I / II / III / IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Altimeter |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Undershoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Flying an aircraft (avionics setup for single pilot) we climbed through transition altitude and I set standard on the altimeter setting. I then checked the standby instruments and set it and mentioned to my copilot to set standard on his side. I did not monitor him setting the altimeter on his side. About 45 minutes later I noticed the altimeter setting was 30.12 on both altimeters.this was caused by me setting standard; then my copilot also selecting the standard baro knob. Since the altimeters were synced due to the owners set up; when the copilot pushed the sync knob the original altimeter setting was placed back into the setting on both the pilot and copilot pfds. We flew in this condition at about 200 feet below the ATC commanded altitude until I noticed our error; then I self-corrected. ATC never did query about our altitude. When flying with a non-standard crew ensure communication is clear; double check for errors on both sides of the crew. Also when flying an owner operated aircraft; change the avionics profile to default as not to impede the owners setup; but also to encourage a review of how the avionics profile is configured.
Original NASA ASRS Text
Title: C525 flight crew reported failing to properly set 29.92 upon passing the transition altitude. Contributing factor was that the aircraft was configured for single-pilot operation. Since the altimeters were synced due to the single-pilot set up; both altimeters returned to the local altimeter setting after the copilot pushed the STD BARO knob.
Narrative: Flying an aircraft (avionics setup for single pilot) we climbed through transition altitude and I set standard on the altimeter setting. I then checked the standby instruments and set it and mentioned to my copilot to set standard on his side. I did not monitor him setting the altimeter on his side. About 45 minutes later I noticed the altimeter setting was 30.12 on both altimeters.This was caused by me setting standard; then my copilot also selecting the standard baro knob. Since the altimeters were synced due to the owners set up; when the copilot pushed the sync knob the original altimeter setting was placed back into the setting on both the pilot and copilot PFDs. We flew in this condition at about 200 feet below the ATC commanded altitude until I noticed our error; then I self-corrected. ATC never did query about our altitude. When flying with a non-standard crew ensure communication is clear; double check for errors on both sides of the crew. Also when flying an owner operated aircraft; change the avionics profile to default as not to impede the owners setup; but also to encourage a review of how the avionics profile is configured.
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.