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Air carrier flight crew reported the autopilot descended too early while on the ewr runway 29 stadium visual resulting in an RA.
| Attributes | |
| ACN | 1420209 |
| Time | |
| Date | 201701 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | EWR.Airport |
| State Reference | NJ |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Widebody Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 4982 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 120 Flight Crew Total 12613 Flight Crew Type 360 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types |
Narrative:
We were cleared for the stadium visual approach to runway 29 at ewr; with the RNAV (rnp) Y 29 loaded in the FMC as an [overlay] and the autopilot engaged. Clearance was to maintain 3000 ft until teb; cleared for the approach. At about 2 nm from teb; we set touchdown zone elevation of 100 ft in the MCP altitude window. We had a short discussion whether setting the altitude was too early. At about 1 NM from teb the aircraft started down. I disconnected the autopilot at 2800 ft and was correcting back to 3000 ft at 2700 ft. In an effort to be smooth; I was not aggressive enough in getting back to 3000 ft. We then received TCAS RA while correcting back to 3000 ft. I attempted to confirm the approach and re-engage the autopilot. The aircraft started down again and was not on the approach track. I do not believe at this point I was in LNAV and because of the MCP altitude; we went low again; I disconnected the autopilot and flew the approach. It was around this time newark tower informed us of a low altitude alert and I made a correction. When the PAPI for runway 29 came into view; we were on profile.
Original NASA ASRS Text
Title: Air carrier flight crew reported the autopilot descended too early while on the EWR Runway 29 Stadium Visual resulting in an RA.
Narrative: We were cleared for the Stadium Visual Approach to Runway 29 at EWR; with the RNAV (RNP) Y 29 loaded in the FMC as an [overlay] and the autopilot engaged. Clearance was to maintain 3000 ft until TEB; cleared for the approach. At about 2 nm from TEB; we set touchdown zone elevation of 100 ft in the MCP altitude window. We had a short discussion whether setting the altitude was too early. At about 1 NM from TEB the aircraft started down. I disconnected the autopilot at 2800 ft and was correcting back to 3000 ft at 2700 ft. In an effort to be smooth; I was not aggressive enough in getting back to 3000 ft. We then received TCAS RA while correcting back to 3000 ft. I attempted to confirm the approach and re-engage the autopilot. The aircraft started down again and was not on the approach track. I do not believe at this point I was in LNAV and because of the MCP altitude; we went low again; I disconnected the autopilot and flew the approach. It was around this time Newark Tower informed us of a Low Altitude Alert and I made a correction. When the PAPI for Runway 29 came into view; we were on profile.
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.