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Flight crew of air carrier medium large transport aircraft failed to maintain assigned heading resulting in less than standard separation. Potential conflict.
| Attributes | |
| ACN | 219230 |
| Time | |
| Date | 199208 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : als |
| State Reference | CO |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 20500 flight time type : 500 |
| ASRS Report | 219230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Center asked for our heading and the told us to maintain that heading. We were proceeding direct ALS after deviating for WX. After passing over ALS we turned 15 degrees left on course forgetting center's clearance to maintain present heading. Center then turned us 90 degrees right to 050 degrees and turned another air carrier flight 20 degrees right. We were turning at our maximum rate. Center said we had a 4 1/2 NM separation. The problem arose as we were given a clearance to maintain present heading 10-15 mins prior to reaching ALS VOR and the heading took us directly over the VOR. The clearance should have been more specific, i.e., maintain present heading after ALS, and should have included a TA. We should have clarified our clearance before turning direct on course.
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT FAILED TO MAINTAIN ASSIGNED HDG RESULTING IN LTSS. POTENTIAL CONFLICT.
Narrative: CTR ASKED FOR OUR HDG AND THE TOLD US TO MAINTAIN THAT HDG. WE WERE PROCEEDING DIRECT ALS AFTER DEVIATING FOR WX. AFTER PASSING OVER ALS WE TURNED 15 DEGS L ON COURSE FORGETTING CTR'S CLRNC TO MAINTAIN PRESENT HDG. CTR THEN TURNED US 90 DEGS R TO 050 DEGS AND TURNED ANOTHER ACR FLT 20 DEGS R. WE WERE TURNING AT OUR MAX RATE. CTR SAID WE HAD A 4 1/2 NM SEPARATION. THE PROBLEM AROSE AS WE WERE GIVEN A CLRNC TO MAINTAIN PRESENT HDG 10-15 MINS PRIOR TO REACHING ALS VOR AND THE HDG TOOK US DIRECTLY OVER THE VOR. THE CLRNC SHOULD HAVE BEEN MORE SPECIFIC, I.E., MAINTAIN PRESENT HDG AFTER ALS, AND SHOULD HAVE INCLUDED A TA. WE SHOULD HAVE CLARIFIED OUR CLRNC BEFORE TURNING DIRECT ON COURSE.
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.