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Air carrier flight at FL330 apparently drifted off course causing a potential conflict. Center gave correcting vectors to both aircraft.
| Attributes | |
| ACN | 111455 |
| Time | |
| Date | 198905 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : drk |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 45 flight time total : 20000 flight time type : 14500 |
| ASRS Report | 111455 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe non adherence : required legal separation other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing northeast on ZLA, leveled at 27000'. 29000' vectored north for climb. Leveled at 31000' through to 33000'. After level cleared direct drake VOR. Cleared for immediate left turn 50 degrees. Another aircraft given 50 degree right turn--advised of conflict and given ZLA phone #. Raw data VOR. Stronger than forecast wind. VOR only navigation, radial drift, scalloping. Lack of precision navigation capability of early jets.
Original NASA ASRS Text
Title: ACR FLT AT FL330 APPARENTLY DRIFTED OFF COURSE CAUSING A POTENTIAL CONFLICT. CENTER GAVE CORRECTING VECTORS TO BOTH ACFT.
Narrative: CLBING NE ON ZLA, LEVELED AT 27000'. 29000' VECTORED N FOR CLB. LEVELED AT 31000' THROUGH TO 33000'. AFTER LEVEL CLRED DIRECT DRAKE VOR. CLRED FOR IMMEDIATE LEFT TURN 50 DEGS. ANOTHER ACFT GIVEN 50 DEG RIGHT TURN--ADVISED OF CONFLICT AND GIVEN ZLA PHONE #. RAW DATA VOR. STRONGER THAN FORECAST WIND. VOR ONLY NAV, RADIAL DRIFT, SCALLOPING. LACK OF PRECISION NAV CAPABILITY OF EARLY JETS.
Data retrieved from NASA's ASRS site as of August 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.