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A319 captain reported during final approach and on ILS the autopilot pitched over chasing the glideslope. The captain stated the glideslope was erratic.
| Attributes | |
| ACN | 1706888 |
| Time | |
| Date | 201912 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | ILS/VOR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 203 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Unstabilized Approach |
Narrative:
While on short final for ILS runway X at 1;500 feet; the aircraft pitched down from approx 800 feet/min to 2;900 feet/min. Autopilot was disconnected and returned to normal descent rate after 1 sec. It appeared to me that the ILS glideslope signal was disturbed and aircraft pitched down to follow the glideslope. Hand flew the rest of approach with no issues.
Original NASA ASRS Text
Title: A319 Captain reported during final approach and on ILS the autopilot pitched over chasing the glideslope. The Captain stated the glideslope was erratic.
Narrative: While on short final for ILS Runway X at 1;500 feet; the aircraft pitched down from approx 800 feet/min to 2;900 feet/min. Autopilot was disconnected and returned to normal descent rate after 1 sec. It appeared to me that the ILS glideslope signal was disturbed and aircraft pitched down to follow the glideslope. Hand flew the rest of approach with no issues.
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.