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A B737 flight crew and the controller involved reported a descent below assigned altitude during a visual approach to runway 30 at oak.
| Attributes | |
| ACN | 1384724 |
| Time | |
| Date | 201609 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | OAK.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | MCP |
| Person 1 | |
| Function | Approach |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 2 |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 196 |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
The B737 came in from the northwest leveled at 5;000 expecting the ILS 30 at oak. From the downwind; the B737 was given a southbound turn heading 200 and a descent to 3;400; which he read back correctly. When I keyed up to turn and clear for ILS approach I noticed he had descended below the MVA 3;400 and assigned altitude 3;400. I cleared him for the approach issuing maintain 3;000 until established; he was still descending; lowest altitude I observed was 2;700. I verified maintain 3;000 until established and advised previously issued altitude was 3;400; pilot replied with; 'sorry we are climbing; we missed it.'I did not issue a low altitude alert and the low altitude alarm did not go off at any point during the occurrence. Not sure why the low altitude alarm did not sound.
Original NASA ASRS Text
Title: A B737 Flight Crew and the Controller involved reported a descent below assigned altitude during a visual approach to Runway 30 at OAK.
Narrative: The B737 came in from the northwest leveled at 5;000 expecting the ILS 30 at OAK. From the downwind; the B737 was given a southbound turn heading 200 and a deScent to 3;400; which he read back correctly. When I keyed up to turn and clear for ILS approach I noticed he had descended below the MVA 3;400 and assigned altitude 3;400. I cleared him for the approach issuing maintain 3;000 until established; he was still descending; lowest altitude I observed was 2;700. I verified maintain 3;000 until established and advised previously issued altitude was 3;400; pilot replied with; 'Sorry we are climbing; we missed it.'I did not issue a low altitude alert and the low altitude alarm did not go off at any point during the occurrence. Not sure why the low altitude alarm did not sound.
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.