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BD70 (glex) flight crew reported overshooting charted altitude during RNAV approach. Crew reported they thought they were in VNAV but were actually in vs mode.
| Attributes | |
| ACN | 1254524 |
| Time | |
| Date | 201504 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | D10.TRACON |
| State Reference | TX |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | Global Express (BD700) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent Initial Approach |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 10000 Flight Crew Type 3600 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 9200 Flight Crew Type 1700 |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance |
Narrative:
Cleared to descend to 3000 feet and to maintain 3000 feet until established on the approach. Cleared for the RNAV GPS 35. Pilot flying (PF) thought he was in VNAV and had the altitude selector set to below field elevation. The aircraft was actually in vertical speed and didn't level off at 3000 feet. The PF was watching the aircraft as it came upon 3000 feet and thought it was leveling off but didn't confirm that it was leveling off. ATC then called the aircraft as we were going through 2500 feet. We immediately returned to 3000 feet after descending 600 feet below our altitude. I believe contributing factors were not knowing/confirming the flight modes the aircraft was in and not monitoring the aircraft properly while on auto pilot.
Original NASA ASRS Text
Title: BD70 (GLEX) flight crew reported overshooting charted altitude during RNAV approach. Crew reported they thought they were in VNAV but were actually in VS mode.
Narrative: Cleared to descend to 3000 feet and to maintain 3000 feet until established on the approach. Cleared for the RNAV GPS 35. Pilot flying (PF) thought he was in VNAV and had the altitude selector set to below field elevation. The aircraft was actually in Vertical Speed and didn't level off at 3000 feet. The PF was watching the aircraft as it came upon 3000 feet and thought it was leveling off but didn't confirm that it was leveling off. ATC then called the aircraft as we were going through 2500 feet. We immediately returned to 3000 feet after descending 600 feet below our altitude. I believe contributing factors were not knowing/confirming the flight modes the aircraft was in and not monitoring the aircraft properly while on auto pilot.
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.