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ZOA controller experienced operational error at FL320 when altitude reports were in disagreement and two in-trail aircraft conflicted.
| Attributes | |
| ACN | 763972 |
| Time | |
| Date | 200711 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | msl single value : 32000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : radar |
| Experience | controller non radar : 25 controller radar : 25 controller time certified in position1 : 25 |
| ASRS Report | 763972 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working oceanic position OC3 at the time of the incident between air carrier X and air carrier Y. Upon air carrier Y progressing doner; the progress report showed FL320. The data block/flight plan showed FL340. Through commercial radio; I requested air carrier Y verify altitude. Air carrier Y again reported at FL320. I entered FL320 as the new altitude for air carrier Y and ocean 21 (atop) displayed an alert between air carrier X and air carrier Y; both at FL320 (6 mins in trail). I then asked air carrier Y if able FL330. Aircraft stated affirmative and I immediately climbed aircraft to FL330.
Original NASA ASRS Text
Title: ZOA CTLR EXPERIENCED OPERROR AT FL320 WHEN ALT REPORTS WERE IN DISAGREEMENT AND TWO IN-TRAIL ACFT CONFLICTED.
Narrative: I WAS WORKING OCEANIC POS OC3 AT THE TIME OF THE INCIDENT BTWN ACR X AND ACR Y. UPON ACR Y PROGRESSING DONER; THE PROGRESS RPT SHOWED FL320. THE DATA BLOCK/FLT PLAN SHOWED FL340. THROUGH COMMERCIAL RADIO; I REQUESTED ACR Y VERIFY ALT. ACR Y AGAIN RPTED AT FL320. I ENTERED FL320 AS THE NEW ALT FOR ACR Y AND OCEAN 21 (ATOP) DISPLAYED AN ALERT BTWN ACR X AND ACR Y; BOTH AT FL320 (6 MINS IN TRAIL). I THEN ASKED ACR Y IF ABLE FL330. ACFT STATED AFFIRMATIVE AND I IMMEDIATELY CLBED ACFT TO FL330.
Data retrieved from NASA's ASRS site as of January 2009 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.