 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B757 turns excessively during ILS intercept in N90 airspace. Flight crew resets autoflt system and everything begins to work properly.
| Attributes | |
| ACN | 385090 |
| Time | |
| Date | 199711 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ewr |
| State Reference | NJ |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 tower : ewr tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 190 flight time total : 15000 flight time type : 1100 |
| ASRS Report | 385090 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : private |
| Experience | flight time last 90 days : 160 flight time total : 5000 flight time type : 1000 |
| ASRS Report | 385410 |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | flight crew : became reoriented flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew Other |
| Miss Distance | horizontal : 24000 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
We were cleared on a 080 degree heading to intercept the localizer to runway 4R at ewr. We were southwest of the grity intersection by about 3-4 mi on our EH5Y map. The autoplt/autothrottle system was engaged at the time. The aircraft then intercepted the localizer (or so we thought) and proceeded inbound. The raw data showed that we were still southwest of the localizer. The aircraft then continued turning left. As the aircraft turned through a 360 degree heading, I realized that something was terribly wrong with the autoplt. I disconnected the autoplt and immediately steered to a 080 degree to intercept the true runway 4R localizer. I had the first officer turn both flight directors off then back on again to reset the system. We rearmed the flight director localizer again and this time it worked. We made an uneventful ILS approach and landing while I hand flew the aircraft to landing. We called controller after landing, explained the situation, and were told not to worry about it. The controller had queried us during the false localizer capture as to what heading we were on. We responded that we were turning right to 080 degrees and had experienced a false capture by the autoplt. There was a possibility of a conflict with one other aircraft had I not responded when I did by taking over manual control of aircraft. TCASII never sounded in TA or RA modes however. Supplemental information from acn 385410: initial heading for vector was 080 degrees. Inbound course for runway 4R is 039 degrees. The aircraft was actually turning through 020 degrees when we realized we had a false capture. Started to turn back to 080 degree vector last from approach control. While in the turn approach controller called and asked our heading. We told him 030 degrees and continuing right turn to 080 degrees and that we had a false capture. Controller was initially concerned about another aircraft that we saw on our TCASII about 4 mi to the left and 800 ft vertically. Called controller at destination and told him what happened, was told not to worry about it.
Original NASA ASRS Text
Title: A B757 TURNS EXCESSIVELY DURING ILS INTERCEPT IN N90 AIRSPACE. FLC RESETS AUTOFLT SYS AND EVERYTHING BEGINS TO WORK PROPERLY.
Narrative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
Data retrieved from NASA's ASRS site as of July 2007 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.