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Emb-175 flight crew reported descending through an altitude on the arrival when the FMS/autopilot failed to level off after an aggressive descent rate.
| Attributes | |
| ACN | 1441424 |
| Time | |
| Date | 201704 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | PHX.Airport |
| State Reference | AZ |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR HYDRR1 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance |
Narrative:
We were cleared to descend on the hydrr 1 arrival to phoenix via the 25L transition. We were then given a runway change to 26 due to an anticipated runway inspection (runway 25R was closed). Just prior to chavo waypoint; the airplane FMS mode went from path to vertical speed (pink) and the airplane pitched over to a greater than 3;000 FPM descent. Even though the VNAV mode was pink; the airplane flew through the 9;000 foot restriction at chavo. The captain alerted the first officer verbally (flying pilot) that the FMS/auto pilot had basically failed and to hand fly the airplane and return to 9;000 feet. The plane got as low as 8;500 to 8;600 feet. We returned promptly to 9;000 feet.english is not the 'home' language for the first officer. He was surprised (zone of confusion) when I told him to hand fly the airplane and get the FMS/autopilot off. Thus; the reason for the very quick 500 feet altitude bust. It should be noted; that the phoenix approach controller never told us to check our altitude as we were over an area of high terrain.
Original NASA ASRS Text
Title: EMB-175 flight crew reported descending through an altitude on the arrival when the FMS/autopilot failed to level off after an aggressive descent rate.
Narrative: We were cleared to descend on the HYDRR 1 Arrival to Phoenix via the 25L Transition. We were then given a runway change to 26 due to an anticipated Runway Inspection (RWY 25R was closed). Just prior to CHAVO waypoint; the airplane FMS Mode went from PATH to Vertical Speed (pink) and the airplane pitched over to a greater than 3;000 FPM descent. Even though the VNAV mode was pink; the airplane flew through the 9;000 foot restriction at CHAVO. The Captain alerted the First Officer verbally (flying pilot) that the FMS/Auto Pilot had basically failed and to hand fly the airplane and return to 9;000 feet. The plane got as low as 8;500 to 8;600 feet. We returned promptly to 9;000 feet.English is not the 'home' language for the First Officer. He was surprised (zone of confusion) when I told him to hand fly the airplane and get the FMS/Autopilot off. Thus; the reason for the very quick 500 feet altitude bust. It should be noted; that the Phoenix Approach Controller never told us to check our altitude as we were over an area of high terrain.
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.