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C340A flew 330 degrees instead of the 300 degrees assigned by approach controller. This resulted in less than standard separation from a DC9.
| Attributes | |
| ACN | 366775 |
| Time | |
| Date | 199704 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | general aviation : personal |
| Make Model Name | Cessna 340/340A |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 29 flight time total : 3291 flight time type : 523 |
| ASRS Report | 366775 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ATC report of deviation from ATC instructions by cessna 340A causing loss of separation from air carrier aircraft (DC9). While following radar vectors issued by ZMP for visual approach to runway 11R, misunderstood vector for heading of 300 degrees to be 330 degrees thus causing, by their report, loss of separation from air carrier DC9. After approach control confirmed my heading to be in error, they issued an immediate left turn to 230 degrees to increase the separation from the DC9 and issued subsequent vectors, all of which I complied with, for my completion of the visual approach to runway 11R. Possible contributing factors: possible pilot fatigue, end of working day, my second flight of day. Approach control frequency at time of incident was not as clear as other frequencys used during same flight. Deviation created by misunderstanding 1 digit of 3 issued in clearance. (Approach control contends I read back correct heading of 300 degrees.) very heavy traffic at msp at that time of day (arrival and departure).
Original NASA ASRS Text
Title: C340A FLEW 330 DEGS INSTEAD OF THE 300 DEGS ASSIGNED BY APCH CTLR. THIS RESULTED IN LTSS FROM A DC9.
Narrative: ATC RPT OF DEV FROM ATC INSTRUCTIONS BY CESSNA 340A CAUSING LOSS OF SEPARATION FROM ACR ACFT (DC9). WHILE FOLLOWING RADAR VECTORS ISSUED BY ZMP FOR VISUAL APCH TO RWY 11R, MISUNDERSTOOD VECTOR FOR HDG OF 300 DEGS TO BE 330 DEGS THUS CAUSING, BY THEIR RPT, LOSS OF SEPARATION FROM ACR DC9. AFTER APCH CTL CONFIRMED MY HDG TO BE IN ERROR, THEY ISSUED AN IMMEDIATE L TURN TO 230 DEGS TO INCREASE THE SEPARATION FROM THE DC9 AND ISSUED SUBSEQUENT VECTORS, ALL OF WHICH I COMPLIED WITH, FOR MY COMPLETION OF THE VISUAL APCH TO RWY 11R. POSSIBLE CONTRIBUTING FACTORS: POSSIBLE PLT FATIGUE, END OF WORKING DAY, MY SECOND FLT OF DAY. APCH CTL FREQ AT TIME OF INCIDENT WAS NOT AS CLR AS OTHER FREQS USED DURING SAME FLT. DEV CREATED BY MISUNDERSTANDING 1 DIGIT OF 3 ISSUED IN CLRNC. (APCH CTL CONTENDS I READ BACK CORRECT HDG OF 300 DEGS.) VERY HVY TFC AT MSP AT THAT TIME OF DAY (ARR AND DEP).
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.