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Foreign ATC controller descended medium large transport through altitude of heavy transport with less than standard separation causing an near midair collision.
| Attributes | |
| ACN | 94208 |
| Time | |
| Date | 198809 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mil |
| State Reference | FO |
| Altitude | msl bound lower : 28800 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : syr |
| Operator | general aviation : corporate |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : lggg |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Heavy Transport, Low Wing, 4 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : cfi pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 9500 flight time type : 150 |
| ASRS Report | 94208 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : insufficient time other |
| Consequence | Other |
| Miss Distance | horizontal : 500 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
En route from cairo to athens, greece, south of milos VOR I was given a descent from FL350 to FL280. The clearance was to fly UA10 over milos, UA10 to kea VOR to athens. Over milos VOR, while descending at 1000 FPM to FL280, athens control asked me to increase rate of descent. About 5 second later, an aircraft passed to the left side of my aircraft at about the same altitude. The near midair collision occurred over the milos VOR. The controller cleared my aircraft through someone else's altitude. I feel this could have been avoided if the controller had given me a crossing restriction 20 mi before (south) milos VOR. The aircraft were not under radar control. Callback conversation with reporter revealed the following. Reporter says other aircraft was heavy transport type 4 engine jet and thinks was air carrier. Aircraft were on same frequency and other aircraft asked ATC who was off his right as aircraft passed. Controller had just asked the reporter to increase his rate of descent when he reported over military leaving FL290. No radar environment and no crossing restriction was given nor did controller ask for any altitude vacating reports. Reporter gave flight time of 100 hours last 90 days and 150 hours in type. Reporter says this is bad area to fly in due to lack of radar and apparently loose control.
Original NASA ASRS Text
Title: FOREIGN ATC CTLR DESCENDED MLG THROUGH ALT OF HVT WITH LESS THAN STANDARD SEPARATION CAUSING AN NMAC.
Narrative: ENRTE FROM CAIRO TO ATHENS, GREECE, S OF MILOS VOR I WAS GIVEN A DSCNT FROM FL350 TO FL280. THE CLRNC WAS TO FLY UA10 OVER MILOS, UA10 TO KEA VOR TO ATHENS. OVER MILOS VOR, WHILE DSNDING AT 1000 FPM TO FL280, ATHENS CTL ASKED ME TO INCREASE RATE OF DSCNT. ABOUT 5 SEC LATER, AN ACFT PASSED TO THE LEFT SIDE OF MY ACFT AT ABOUT THE SAME ALT. THE NMAC OCCURRED OVER THE MILOS VOR. THE CTLR CLRED MY ACFT THROUGH SOMEONE ELSE'S ALT. I FEEL THIS COULD HAVE BEEN AVOIDED IF THE CTLR HAD GIVEN ME A XING RESTRICTION 20 MI BEFORE (S) MILOS VOR. THE ACFT WERE NOT UNDER RADAR CTL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING. RPTR SAYS OTHER ACFT WAS HVT TYPE 4 ENG JET AND THINKS WAS ACR. ACFT WERE ON SAME FREQ AND OTHER ACFT ASKED ATC WHO WAS OFF HIS RIGHT AS ACFT PASSED. CTLR HAD JUST ASKED THE RPTR TO INCREASE HIS RATE OF DSCNT WHEN HE RPTED OVER MIL LEAVING FL290. NO RADAR ENVIRONMENT AND NO XING RESTRICTION WAS GIVEN NOR DID CTLR ASK FOR ANY ALT VACATING RPTS. RPTR GAVE FLT TIME OF 100 HRS LAST 90 DAYS AND 150 HRS IN TYPE. RPTR SAYS THIS IS BAD AREA TO FLY IN DUE TO LACK OF RADAR AND APPARENTLY LOOSE CTL.
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.