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A lear 45 flight crew experienced an altitude deviation when the captain used the altimeter setting knob while setting minimums for approach instead of the approach minimums setting knob.
| Attributes | |
| ACN | 854589 |
| Time | |
| Date | 200910 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | BHM.Airport |
| State Reference | AL |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Learjet 45 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Altimeter |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 7800 Flight Crew Type 300 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 5500 Flight Crew Type 800 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy |
Narrative:
The flying pilot was attempting to set the minimums for the approach and selected the altimeter setting knob by mistake. Once the altimeter knob was turned the aircraft started a descent trying to maintain the altitude selected. I questioned the flying pilot about the descent and he decoupled the autopilot and climbed the aircraft back to the assigned altitude. The flight continued to its destination and landed uneventfully.
Original NASA ASRS Text
Title: A Lear 45 Flight Crew experienced an altitude deviation when the Captain used the altimeter setting knob while setting minimums for approach instead of the approach minimums setting knob.
Narrative: The flying pilot was attempting to set the minimums for the approach and selected the altimeter setting knob by mistake. Once the altimeter knob was turned the aircraft started a descent trying to maintain the altitude selected. I questioned the flying pilot about the descent and he decoupled the autopilot and climbed the aircraft back to the assigned altitude. The flight continued to its destination and landed uneventfully.
Data retrieved from NASA's ASRS site as of April 2012 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.