 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A320 flight crew deviate from assigned routing because of A320 fmcs flight characteristics and are involved in a pilot deviation.
| Attributes | |
| ACN | 514400 |
| Time | |
| Date | 200106 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : lolly |
| State Reference | NY |
| Altitude | msl single value : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach ground : preflight |
| Route In Use | arrival star : ign.ign6 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer pilot : instrument pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 150 |
| ASRS Report | 514400 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 12000 flight time type : 1000 |
| ASRS Report | 514298 |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : took precautionary avoidance action flight crew : returned to intended or assigned course |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 27000 |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were approximately 40 mi west of ign. We were cleared by ZBW direct lolly, as filed (ign.6) then at 20 mi west of lolly, we were cleared to cross lolly at FL200. About 6 mi west of lolly we were at FL200 and the aircraft (FMGC) started a turn towards the next fix (doore). ZNY then asked us where we were going, 'aircraft X are you direct lendy,' to which we informed him as to our previous clearance. We did have visual on the conflicting traffic but that traffic was never called by ATC. Supplemental information from acn 514298: the A320 FMGS will never cross the exact point in space if there is a significant heading change. We received a TCASII TA with an aircraft climbing. ZNY queried us about our flight routing. They were under the impression we were cleared direct lendy after lolly. After landing, I talked with the shift supervisor. He told me he remembered the A320's turn characteristics at high altitude. Our fom encourages us to use the full capabilities of the FMGS. There seems to be a conflict with that philosophy and ATC procedures. As the PIC, I was informed there was a possible pilot deviation, since separation was less than 5 mi.
Original NASA ASRS Text
Title: A320 FLC DEVIATE FROM ASSIGNED ROUTING BECAUSE OF A320 FMCS FLT CHARACTERISTICS AND ARE INVOLVED IN A PLTDEV.
Narrative: WE WERE APPROX 40 MI W OF IGN. WE WERE CLRED BY ZBW DIRECT LOLLY, AS FILED (IGN.6) THEN AT 20 MI W OF LOLLY, WE WERE CLRED TO CROSS LOLLY AT FL200. ABOUT 6 MI W OF LOLLY WE WERE AT FL200 AND THE ACFT (FMGC) STARTED A TURN TOWARDS THE NEXT FIX (DOORE). ZNY THEN ASKED US WHERE WE WERE GOING, 'ACFT X ARE YOU DIRECT LENDY,' TO WHICH WE INFORMED HIM AS TO OUR PREVIOUS CLRNC. WE DID HAVE VISUAL ON THE CONFLICTING TFC BUT THAT TFC WAS NEVER CALLED BY ATC. SUPPLEMENTAL INFO FROM ACN 514298: THE A320 FMGS WILL NEVER CROSS THE EXACT POINT IN SPACE IF THERE IS A SIGNIFICANT HEADING CHANGE. WE RECEIVED A TCASII TA WITH AN ACFT CLBING. ZNY QUERIED US ABOUT OUR FLT ROUTING. THEY WERE UNDER THE IMPRESSION WE WERE CLRED DIRECT LENDY AFTER LOLLY. AFTER LNDG, I TALKED WITH THE SHIFT SUPVR. HE TOLD ME HE REMEMBERED THE A320'S TURN CHARACTERISTICS AT HIGH ALT. OUR FOM ENCOURAGES US TO USE THE FULL CAPABILITIES OF THE FMGS. THERE SEEMS TO BE A CONFLICT WITH THAT PHILOSOPHY AND ATC PROCS. AS THE PIC, I WAS INFORMED THERE WAS A POSSIBLE PLTDEV, SINCE SEPARATION WAS LESS THAN 5 MI.
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.