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Prior to intercepting the lga runway 13 ILS localizer; a B737-800 captain selected the app mode and as the glideslope indicatored passed through centered climbing; the aircraft unexpectely pitched.
| Attributes | |
| ACN | 1129955 |
| Time | |
| Date | 201311 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | LGA.Airport |
| State Reference | NY |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy |
Narrative:
At approximately 3 miles outside of paymi; at 3;000 ft; on a vector to intercept final; and with clearance for the ILS 13 approach; I selected approach mode with the autopilot engaged. The glideslope indicator was passing through centered to the below glideslope indication; so the aircraft began a strong climb to 'catch' the glideslope. I disengaged the autopilot and began a smooth pushover. I topped out at 3;300 before correcting back to 3;000 prior to paymi.do not engage approach mode prior to localizer capture. Be more situationally aware of where the glideslope is and where capture should occur.
Original NASA ASRS Text
Title: Prior to intercepting the LGA Runway 13 ILS localizer; a B737-800 Captain selected the APP mode and as the glideslope indicatored passed through centered climbing; the aircraft unexpectely pitched.
Narrative: At approximately 3 miles outside of PAYMI; at 3;000 FT; on a vector to intercept final; and with clearance for the ILS 13 approach; I selected approach mode with the autopilot engaged. The glideslope indicator was passing through centered to the below glideslope indication; so the aircraft began a strong climb to 'catch' the glideslope. I disengaged the autopilot and began a smooth pushover. I topped out at 3;300 before correcting back to 3;000 prior to PAYMI.Do not engage approach mode prior to localizer capture. Be more situationally aware of where the glideslope is and where capture should occur.
Data retrieved from NASA's ASRS site as of July 2013 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.