 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Pilot took a descent clearance for another aircraft which resulted in less than standard separation from aircraft below him.
| Attributes | |
| ACN | 154214 |
| Time | |
| Date | 199008 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 7000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 154214 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While trying to establish communications with 2 light transport aircraft (1 being in my airspace second officer communication xfer) 30 mi northwest of sea, light transport took the descent clearance of large transport (both having an 'X' in their call sign) and caused a loss of sep between light transport and an small aircraft on IFR clearance at 9000'. I attempted communications with light transport and instructed a 'climb to 10000 right now.' I then told controller to turn the small aircraft he was already turning said aircraft. Light transport and small aircraft passed with 500' and 1 1/2 mi horizontal.
Original NASA ASRS Text
Title: PLT TOOK A DESCENT CLRNC FOR ANOTHER ACFT WHICH RESULTED IN LESS THAN STANDARD SEPARATION FROM ACFT BELOW HIM.
Narrative: WHILE TRYING TO ESTABLISH COMS WITH 2 LTT ACFT (1 BEING IN MY AIRSPACE S/O COM XFER) 30 MI NW OF SEA, LTT TOOK THE DSNT CLRNC OF LGT (BOTH HAVING AN 'X' IN THEIR CALL SIGN) AND CAUSED A LOSS OF SEP BTWN LTT AND AN SMA ON IFR CLRNC AT 9000'. I ATTEMPTED COMS WITH LTT AND INSTRUCTED A 'CLB TO 10000 RIGHT NOW.' I THEN TOLD CTLR TO TURN THE SMA HE WAS ALREADY TURNING SAID ACFT. LTT AND SMA PASSED WITH 500' AND 1 1/2 MI HORIZ.
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.