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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier DC9 flight crew, while on vector to msp ILS runway 30L final approach course, encounters 2 TCASII RA's. Approach control apparently forgot to turn aircraft onto final. Additional cockpit distraction workload caused by missed TRACON frequency change. First officer believes 'dual head radio' capability would enhance cockpit functionality.
| Attributes | |
| ACN | 390792 |
| Time | |
| Date | 199801 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : fgt airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent : approach |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent : approach |
| Route In Use | arrival other enroute : on vectors |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 7600 flight time type : 1900 |
| ASRS Report | 391050 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 11000 flight time type : 5900 |
| ASRS Report | 390792 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 10000 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were assigned a 120 degree heading after the farmington VOR at 7000 ft for approach to runway 30L at msp. After about 6 mins on that heading, we noticed we were heading into the runway 30L final (good VMC on top). The captain calls back approach control for a turn. At the same time, we get a TCASII RA. I disengage the autoplt and follow the TCASII commands (climb). The controller gave us a right turn to 150 degrees. The captain said he had the traffic in sight. The controller said 'maintain visual separation' and switches us to the next controller and maintain 7000 ft. I then got a second TCASII RA, another climb. I followed the command. The captain missed the frequency in the confusion (single head radios). It took him 20 seconds to get the correct frequency. Clear of conflict, I returned to 7000 ft. The new controller turned us 20 degrees more right and the rest of the approach was normal. The controller forgot about us, and the situation would have been more serious if it had been IMC or had we had no TCASII. Dual head radios would have helped get the radio frequency correct the first time. Fatigue was not a factor in the cockpit. It was the first leg of the day.
Original NASA ASRS Text
Title: ACR DC9 FLC, WHILE ON VECTOR TO MSP ILS RWY 30L FINAL APCH COURSE, ENCOUNTERS 2 TCASII RA'S. APCH CTL APPARENTLY FORGOT TO TURN ACFT ONTO FINAL. ADDITIONAL COCKPIT DISTR WORKLOAD CAUSED BY MISSED TRACON FREQ CHANGE. FO BELIEVES 'DUAL HEAD RADIO' CAPABILITY WOULD ENHANCE COCKPIT FUNCTIONALITY.
Narrative: WE WERE ASSIGNED A 120 DEG HDG AFTER THE FARMINGTON VOR AT 7000 FT FOR APCH TO RWY 30L AT MSP. AFTER ABOUT 6 MINS ON THAT HDG, WE NOTICED WE WERE HDG INTO THE RWY 30L FINAL (GOOD VMC ON TOP). THE CAPT CALLS BACK APCH CTL FOR A TURN. AT THE SAME TIME, WE GET A TCASII RA. I DISENGAGE THE AUTOPLT AND FOLLOW THE TCASII COMMANDS (CLB). THE CTLR GAVE US A R TURN TO 150 DEGS. THE CAPT SAID HE HAD THE TFC IN SIGHT. THE CTLR SAID 'MAINTAIN VISUAL SEPARATION' AND SWITCHES US TO THE NEXT CTLR AND MAINTAIN 7000 FT. I THEN GOT A SECOND TCASII RA, ANOTHER CLB. I FOLLOWED THE COMMAND. THE CAPT MISSED THE FREQ IN THE CONFUSION (SINGLE HEAD RADIOS). IT TOOK HIM 20 SECONDS TO GET THE CORRECT FREQ. CLR OF CONFLICT, I RETURNED TO 7000 FT. THE NEW CTLR TURNED US 20 DEGS MORE R AND THE REST OF THE APCH WAS NORMAL. THE CTLR FORGOT ABOUT US, AND THE SIT WOULD HAVE BEEN MORE SERIOUS IF IT HAD BEEN IMC OR HAD WE HAD NO TCASII. DUAL HEAD RADIOS WOULD HAVE HELPED GET THE RADIO FREQ CORRECT THE FIRST TIME. FATIGUE WAS NOT A FACTOR IN THE COCKPIT. IT WAS THE FIRST LEG OF THE DAY.
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.