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Hawker 800XP captain reported that an autopilot malfunction during approach resulted in an altitude deviation.
| Attributes | |
| ACN | 1740908 |
| Time | |
| Date | 202004 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | PCT.TRACON |
| State Reference | VA |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | BAe 125 Series 800 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
Potomac approach give us instructions as we crossed cavalier fix to proceed directly to mosby fix (if) for ILS runway 1R; and maintain 4;000 ft. Seven miles from the fix we were instructed to [descend to] 3;000 ft. To cross mosby and cleared for the ILS approach.as we crossed mosby at 3;000 ft. I armed approach and allowed autopilot [to] continue approach. As [we] were getting closer to the next fix [waxin at 1;900 ft. With] GS captured I noticed autopilot [was] not holding 1;900 ft. And continued to descend. I disconnected the autopilot and hand flew the aircraft to the proper attitude on the glidepath. At the same time tower notified us they are getting low alert altitude warning. We acknowledged the correction and indicated we were on the glidepath and proceeded with our approach to complete the landing.the lesson I learned from this [is] always be prepared to take the airplane from automation and fly the airplane.
Original NASA ASRS Text
Title: Hawker 800XP Captain reported that an autopilot malfunction during approach resulted in an altitude deviation.
Narrative: Potomac Approach give us instructions as we crossed Cavalier fix to proceed directly to Mosby fix (IF) for ILS Runway 1R; and maintain 4;000 ft. Seven miles from the fix we were instructed to [descend to] 3;000 ft. to cross Mosby and cleared for the ILS approach.As we crossed MOSBY at 3;000 ft. I armed approach and allowed autopilot [to] continue approach. As [we] were getting closer to the next fix [Waxin at 1;900 ft. with] GS captured I noticed autopilot [was] not holding 1;900 ft. and continued to descend. I disconnected the autopilot and hand flew the aircraft to the proper attitude on the glidepath. At the same time Tower notified us they are getting low alert altitude warning. We acknowledged the correction and indicated we were on the glidepath and proceeded with our approach to complete the landing.The lesson I learned from this [is] always be prepared to take the airplane from automation and fly the airplane.
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.