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Air carrier flight crew descended below a STAR published minimum altitude due to being in FMC lvl chg rather than VNAV mode.
| Attributes | |
| ACN | 1304312 |
| Time | |
| Date | 201510 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | D01.TRACON |
| State Reference | CO |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | Medium Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | STAR TELLR2 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 113 Flight Crew Type 1259 |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 172 Flight Crew Total 940 Flight Crew Type 465 |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance |
Narrative:
On arrival on the TELLR2 arrival; 10 miles prior to cragg ATC requested us to slow to 210 KTS and then expedite to 10;000. The captain slowed to 210 and then expedited to 10;000 by switching from VNAV to lvl chg. Shortly after we were cleared for the approach. I put 7;000 in the MCP for the FAF altitude at corde. At approximately 9;700 feet I noticed we were below the published minimum altitude of 10;000 and advised the captain. At 9;300 feet he started a climb back to 10;000. The error we made was not going back into VNAV after being cleared for the approach.
Original NASA ASRS Text
Title: Air carrier flight crew descended below a STAR published minimum altitude due to being in FMC LVL CHG rather than VNAV mode.
Narrative: On arrival on the TELLR2 Arrival; 10 miles prior to CRAGG ATC requested us to slow to 210 KTS and then expedite to 10;000. The Captain slowed to 210 and then expedited to 10;000 by switching from VNAV to LVL CHG. Shortly after we were cleared for the approach. I put 7;000 in the MCP for the FAF altitude at CORDE. At approximately 9;700 feet I noticed we were below the published minimum altitude of 10;000 and advised the Captain. At 9;300 feet he started a climb back to 10;000. The error we made was not going back into VNAV after being cleared for the approach.
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.