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ZBW controller reported a B739 crew on a descend via clearance descended below published crossing restriction.
| Attributes | |
| ACN | 1534901 |
| Time | |
| Date | 201804 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZBW.ARTCC |
| State Reference | NH |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR ROBUC3 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft X was level at 11;000 and given clearance direct provi. A few minutes later; I issued a descend via clearance to the aircraft for runway 22L at bos. The pilot read back correctly. Minutes after; I was issuing aircraft X a clearance direct krann when I noticed the aircraft descending out of 10;700. I immediately changed the clearance verbiage and issued an altitude instruction to maintain 11;000 along with the clearance to krann. This occurred about 15 miles west of provi (base altitude at provi is at or above 11;000). The aircraft continued down to 10;400 as I was calling pvd approach to point out the aircraft. After the coordination; I advised aircraft X that the base altitude at provi was 11;000 and to maintain 11;000 until krann as that too is the base altitude.more training for pilots to understand how [to] fly a descend via clearance. It is becoming harder and harder to trust that the procedure works safely.
Original NASA ASRS Text
Title: ZBW Controller reported a B739 crew on a descend via clearance descended below published crossing restriction.
Narrative: Aircraft X was level at 11;000 and given clearance direct PROVI. A few minutes later; I issued a descend via clearance to the aircraft for Runway 22L at BOS. The pilot read back correctly. Minutes after; I was issuing Aircraft X a clearance direct KRANN when I noticed the aircraft descending out of 10;700. I immediately changed the clearance verbiage and issued an altitude instruction to maintain 11;000 along with the clearance to KRANN. This occurred about 15 miles west of PROVI (base altitude at PROVI is at or above 11;000). The aircraft continued down to 10;400 as I was calling PVD Approach to point out the aircraft. After the coordination; I advised Aircraft X that the base altitude at PROVI was 11;000 and to maintain 11;000 until KRANN as that too is the base altitude.More training for pilots to understand how [to] fly a descend via clearance. It is becoming harder and harder to trust that the procedure works safely.
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.