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An air carrier crew and ATC controller reported that a descent was begun following localizer capture rather than after intercepting the glideslope as assigned.
| Attributes | |
| ACN | 1358122 |
| Time | |
| Date | 201605 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | D10.TRACON |
| State Reference | TX |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Other Instrument Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Other Instrument Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 6.0 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy |
Narrative:
I cleared aircraft X for the ILS approach with 'maintain four thousand till intercepting the glideslope; cleared ILS ... Approach'. Aircraft Y was going to the parallel runway at 3;000 feet. Aircraft X joined the final and immediately descended out of 4;000 feet. Final monitor corrected them and climbed them back up to 4;000 feet until the glideslope descended out of 4;000 feet again. Aircraft X descended out of 4000 feet next to aircraft Y before aircraft Y was established. We have requested 4;000 foot intersection points on the finals for a long time and this is the exact reason why. Even though the pilot knew exactly what I meant; he still descended to 3;000 feet even though the glideslope was way above their altitude. Technically; 'maintain an altitude until intercepting the glideslope' isn't approved phraseology; so having a crossing fix at 4;000 feet on every final would be a very nice option.
Original NASA ASRS Text
Title: An air carrier crew and ATC controller reported that a descent was begun following localizer capture rather than after intercepting the glideslope as assigned.
Narrative: I cleared Aircraft X for the ILS approach with 'maintain four thousand till intercepting the glideslope; cleared ILS ... approach'. Aircraft Y was going to the parallel runway at 3;000 feet. Aircraft X joined the final and immediately descended out of 4;000 feet. Final monitor corrected them and climbed them back up to 4;000 feet until the glideslope descended out of 4;000 feet again. Aircraft X descended out of 4000 feet next to Aircraft Y before Aircraft Y was established. We have requested 4;000 foot intersection points on the finals for a long time and this is the exact reason why. Even though the pilot knew exactly what I meant; he still descended to 3;000 feet even though the glideslope was way above their altitude. Technically; 'maintain an altitude until intercepting the glideslope' isn't approved phraseology; so having a crossing fix at 4;000 feet on every final would be a very nice option.
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.