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Air carrier X had less than standard separation from air carrier Y. System error. TCASII TA RA evasive action taken.
| Attributes | |
| ACN | 184022 |
| Time | |
| Date | 199107 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : phl |
| State Reference | PA |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl tower : dpa |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 16200 flight time type : 10000 |
| ASRS Report | 184022 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was on vectors for ILS runway 27R. We were told to turn left heading 290 degree from over heading 360 degree and intercept 27R localizer and cleared for approach runway 27R cross OM 2100 or above. We started a descent from 3000 ft. At about 2800 ft we got a TA for traffic. It showed about 1 O'clock about 5 mi and 800 ft below. I stopped descent. At this time we got an RA to climb at 2000 FPM. I climbed to about 3250 ft and air carrier Y passed under by about 300 ft and 2 mi away. First officer told approach control of RA maneuver and he vectored us for another approach. I called approach control. I talked to supervisor on duty. He said that the controller working air carrier X thought the separation was sufficient with our vector for approach. He said maybe his radar was late in tracking the flts. I asked if he thought we did what we should have because of the RA and he said yes.
Original NASA ASRS Text
Title: ACR X HAD LTSS FROM ACR Y. SYS ERROR. TCASII TA RA EVASIVE ACTION TAKEN.
Narrative: ACR X WAS ON VECTORS FOR ILS RWY 27R. WE WERE TOLD TO TURN L HDG 290 DEG FROM OVER HDG 360 DEG AND INTERCEPT 27R LOC AND CLRED FOR APCH RWY 27R CROSS OM 2100 OR ABOVE. WE STARTED A DSCNT FROM 3000 FT. AT ABOUT 2800 FT WE GOT A TA FOR TFC. IT SHOWED ABOUT 1 O'CLOCK ABOUT 5 MI AND 800 FT BELOW. I STOPPED DSCNT. AT THIS TIME WE GOT AN RA TO CLB AT 2000 FPM. I CLBED TO ABOUT 3250 FT AND ACR Y PASSED UNDER BY ABOUT 300 FT AND 2 MI AWAY. FO TOLD APCH CTL OF RA MANEUVER AND HE VECTORED US FOR ANOTHER APCH. I CALLED APCH CTL. I TALKED TO SUPVR ON DUTY. HE SAID THAT THE CTLR WORKING ACR X THOUGHT THE SEPARATION WAS SUFFICIENT WITH OUR VECTOR FOR APCH. HE SAID MAYBE HIS RADAR WAS LATE IN TRACKING THE FLTS. I ASKED IF HE THOUGHT WE DID WHAT WE SHOULD HAVE BECAUSE OF THE RA AND HE SAID YES.
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.