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A320 flight crew reported the FMS descended below one of the intersection fix altitudes while in descent mode on the DRLLR4 arrival to iah. Crew disengaged autopilot and returned to STAR clearance.
| Attributes | |
| ACN | 1341460 |
| Time | |
| Date | 201603 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | IAH.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR DRLLR4 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 21100 Flight Crew Type 5732 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 227 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy |
Narrative:
Cleared to descend via the drllr landing 26R. 6000 set correctly in FCU window. Des mode used. Both pilots separately and completely checked each altitude restriction. Two separate times PF had to use full speed brakes for altitude corrections; and waypoints correctly showed orange indicating crossing problems. At our request ATC cleared us runway 27 by descending via the DRLLR4 runway 27 except maintain 6000; and after domno fly heading 085. PF changed runway to 27. As the pm returned from a PA announcement; it was noted the ptrol intersection was crossed about 10;700 ft in the des mode. The correct altitude is between 11000-13000 ft. The PF disengaged the a/P and leveled off. The occurrence happened in des mode with no deviation from descent path and no orange waypoint.
Original NASA ASRS Text
Title: A320 flight crew reported the FMS descended below one of the intersection fix altitudes while in descent mode on the DRLLR4 Arrival to IAH. Crew disengaged autopilot and returned to STAR clearance.
Narrative: Cleared to descend via the DRLLR landing 26R. 6000 set correctly in FCU window. DES mode used. Both pilots separately and completely checked each altitude restriction. Two separate times PF had to use full speed brakes for altitude corrections; and waypoints correctly showed orange indicating crossing problems. At our request ATC cleared us runway 27 by descending via the DRLLR4 runway 27 except maintain 6000; and after DOMNO fly heading 085. PF changed runway to 27. As the PM returned from a PA announcement; it was noted the PTROL intersection was crossed about 10;700 ft in the DES mode. The correct altitude is between 11000-13000 ft. The PF disengaged the A/P and leveled off. The occurrence happened in DES mode with no deviation from descent path and no orange waypoint.
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.