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A B737NG flying an autopilot coupled approach to lga runway 22 in VMC; apparently captured a false glideslope at 4;000 ft and with the localizer and glideslope engaged began a higher than normal rate of descent. The crew turned both flight directors off; autopilot off and leveled at 1;500 ft well below the glideslope prior to greko which has a 1;900 ft crossing restriction.
| Attributes | |
| ACN | 1160269 |
| Time | |
| Date | 201403 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | LGA.Airport |
| State Reference | NY |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance |
Narrative:
While on a visual approach to runway 22 at lga; runway 22 ILS was tuned and identified. We were cleared for the visual from 4;000 ft. 1;900 ft was set in the MCP and app was selected. VOR/localizer and glideslope both turned green in the FMA and the aircraft began to descend. The aircraft began to descend more rapidly than normal and began accelerating. The aircraft descended well below the glide path but the cockpit indications of both myself and the first officer show on glideslope. Approaching 1;900 ft we began to override the automation; both flight directors off; autopilot off and altitude hold selected. The aircraft leveled off at 1;500 ft. We continued with the approach without automation and landed on [runway] 22. I then wrote this up in the maintenance logbook.aircraft flew below glideslope with autopilot on and glideslope coupled while cockpit indications showed on glideslope.
Original NASA ASRS Text
Title: A B737NG flying an autopilot coupled approach to LGA Runway 22 in VMC; apparently captured a false glideslope at 4;000 FT and with the localizer and glideslope engaged began a higher than normal rate of descent. The crew turned both flight directors OFF; autopilot OFF and leveled at 1;500 FT well below the glideslope prior to GREKO which has a 1;900 FT crossing restriction.
Narrative: While on a visual approach to Runway 22 at LGA; Runway 22 ILS was tuned and identified. We were cleared for the visual from 4;000 FT. 1;900 FT was set in the MCP and APP was selected. VOR/LOC and glideslope both turned green in the FMA and the aircraft began to descend. The aircraft began to descend more rapidly than normal and began accelerating. The aircraft descended well below the glide path but the cockpit indications of both myself and the First Officer show on glideslope. Approaching 1;900 FT we began to override the automation; both flight directors OFF; autopilot OFF and altitude hold selected. The aircraft leveled off at 1;500 FT. We continued with the approach without automation and landed on [Runway] 22. I then wrote this up in the maintenance logbook.Aircraft flew below glideslope with autopilot ON and glideslope COUPLED while cockpit indications showed on glideslope.
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.