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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Excursion from assigned altitude and heading due to a potential traffic conflict during approach.
| Attributes | |
| ACN | 203324 |
| Time | |
| Date | 199202 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : okc |
| State Reference | OK |
| Altitude | msl bound lower : 5500 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : okc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 11700 |
| ASRS Report | 203324 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 8000 |
| ASRS Report | 202961 |
| Events | |
| Anomaly | conflict : nmac other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
On descent for landing into will rogers airport at oklahoma city on a vector turn from approach control to intercept the final approach course for the 35R ILS. Approach control called out VFR traffic at our 10 O'clock position at 5500 ft. We were at 6000 ft. Traffic was displayed on our (medium large transport) TCASII at 500 ft below us. The (small aircraft) called that he had us in sight and as told to see and avoid us at that point. I then got a warning from TCASII for traffic and saw he was still 500 ft below us - but then noticed he came up to 400 ft, then 300 ft. I then looked to confirm this visually and determined there could be a conflict and chose to turn away and descend to the right and down. TCASII warning us to avoid at exactly the same moment. Approach control was advised of our deviation. I turned 30 degree to the right and descended 400-500 ft. The TCASII called clear of conflict and we then continued with approach control to vectors for our final approach and landing. I called the approach control supervisor upon landing and voiced my concern. I discussed the situation with mr. (TRACON AC), he understood my concern and recorded our conversation. He said he knew of the small aircraft and that they operate in that area often dropping parachutists.
Original NASA ASRS Text
Title: EXCURSION FROM ASSIGNED ALT AND HDG DUE TO A POTENTIAL TFC CONFLICT DURING APCH.
Narrative: ON DSCNT FOR LNDG INTO WILL ROGERS ARPT AT OKLAHOMA CITY ON A VECTOR TURN FROM APCH CTL TO INTERCEPT THE FINAL APCH COURSE FOR THE 35R ILS. APCH CTL CALLED OUT VFR TFC AT OUR 10 O'CLOCK POS AT 5500 FT. WE WERE AT 6000 FT. TFC WAS DISPLAYED ON OUR (MLG) TCASII AT 500 FT BELOW US. THE (SMA) CALLED THAT HE HAD US IN SIGHT AND AS TOLD TO SEE AND AVOID US AT THAT POINT. I THEN GOT A WARNING FROM TCASII FOR TFC AND SAW HE WAS STILL 500 FT BELOW US - BUT THEN NOTICED HE CAME UP TO 400 FT, THEN 300 FT. I THEN LOOKED TO CONFIRM THIS VISUALLY AND DETERMINED THERE COULD BE A CONFLICT AND CHOSE TO TURN AWAY AND DSND TO THE R AND DOWN. TCASII WARNING US TO AVOID AT EXACTLY THE SAME MOMENT. APCH CTL WAS ADVISED OF OUR DEV. I TURNED 30 DEG TO THE R AND DSNDED 400-500 FT. THE TCASII CALLED CLR OF CONFLICT AND WE THEN CONTINUED WITH APCH CTL TO VECTORS FOR OUR FINAL APCH AND LNDG. I CALLED THE APCH CTL SUPVR UPON LNDG AND VOICED MY CONCERN. I DISCUSSED THE SITUATION WITH MR. (TRACON AC), HE UNDERSTOOD MY CONCERN AND RECORDED OUR CONVERSATION. HE SAID HE KNEW OF THE SMA AND THAT THEY OPERATE IN THAT AREA OFTEN DROPPING PARACHUTISTS.
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.