 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Less than standard separation between enroute mdt at 12000 and widebody transport climbing through that altitude.
| Attributes | |
| ACN | 86102 |
| Time | |
| Date | 198804 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mxe airport : phl |
| State Reference | PA |
| Altitude | msl bound lower : 12000 msl bound upper : 12400 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 8 controller non radar : 5 controller radar : 10 |
| ASRS Report | 86102 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : unable other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 16500 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was in the process of decombining second 25 mxe from second 27 mdt. Widebody transport X departure phl going mxe mxe 278 J48 EMI to cun came over 130 phl approach. Controller cleared him to 100 and did not catch the readback when pilot said climbing to 130 and turned him over to my frequency (135.45) widebody transport X called on climbing to 130 I did not catch it and thought he said climbing to 100 which is SOP. I first noticed it when widebody transport X altitude showed 400 ft above assigned altitude I immediately told widebody transport X to maintain 100 with no acknowledgement. I saw he continued to climb and again told him to maintain 100 he was past 110, I turned him to a 340 degree heading and told him he was cleared to 100 only he then advised me that phl departure control climbed him to 130, it was then too late, minimum separation had been lost with mdt Y departure hpn going mxe V378 balance dca at 120. Mdt Y was over mxe at 120 when widebody transport X was over mxe climbing to 130. Aircraft passed with 2 3/4 mile and 400'.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION BETWEEN ENROUTE MDT AT 12000 AND WDB CLIMBING THROUGH THAT ALT.
Narrative: I WAS IN THE PROCESS OF DECOMBINING SEC 25 MXE FROM SEC 27 MDT. WDB X DEP PHL GOING MXE MXE 278 J48 EMI TO CUN CAME OVER 130 PHL APCH. CTLR CLRED HIM TO 100 AND DID NOT CATCH THE READBACK WHEN PLT SAID CLIMBING TO 130 AND TURNED HIM OVER TO MY FREQ (135.45) WDB X CALLED ON CLIMBING TO 130 I DID NOT CATCH IT AND THOUGHT HE SAID CLIMBING TO 100 WHICH IS SOP. I FIRST NOTICED IT WHEN WDB X ALT SHOWED 400 FT ABOVE ASSIGNED ALT I IMMEDIATELY TOLD WDB X TO MAINTAIN 100 WITH NO ACKNOWLEDGEMENT. I SAW HE CONTINUED TO CLIMB AND AGAIN TOLD HIM TO MAINTAIN 100 HE WAS PAST 110, I TURNED HIM TO A 340 DEG HEADING AND TOLD HIM HE WAS CLRED TO 100 ONLY HE THEN ADVISED ME THAT PHL DEP CTL CLIMBED HIM TO 130, IT WAS THEN TOO LATE, MINIMUM SEPARATION HAD BEEN LOST WITH MDT Y DEP HPN GOING MXE V378 BAL DCA AT 120. MDT Y WAS OVER MXE AT 120 WHEN WDB X WAS OVER MXE CLIMBING TO 130. ACFT PASSED WITH 2 3/4 MILE AND 400'.
Data retrieved from NASA's ASRS site as of August 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.