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Military controller descended the light transport to 2000', which resulted in less than standard separation with the mlt at 2000'.
| Attributes | |
| ACN | 174870 |
| Time | |
| Date | 199103 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : myr |
| State Reference | SC |
| Altitude | msl bound lower : 2500 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | military facility : myr |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Military Transport |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 9000 flight time type : 5000 |
| ASRS Report | 174870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cleared by myr approach to descend to 2000', then advised of traffic (mlt) already at 2000'. He was northbound, we were eastbound. By the time I asked for clarification and had our rate of descent slowed, we were told to level at 3000' (we had already descended through 2500'). We immediately climbed back to 3000'. Controller advised traffic 1 mi. We think the 2 aircraft had under 500' and 1 mi sep. The other pilot said he saw us, we never saw him. Discussion with tower supervisor after landing resulted in pulling the tapes and relieving the controller for review.
Original NASA ASRS Text
Title: MIL CTLR DESCENDED THE LTT TO 2000', WHICH RESULTED IN LESS THAN STANDARD SEPARATION WITH THE MLT AT 2000'.
Narrative: CLRED BY MYR APCH TO DSND TO 2000', THEN ADVISED OF TFC (MLT) ALREADY AT 2000'. HE WAS NBND, WE WERE EBND. BY THE TIME I ASKED FOR CLARIFICATION AND HAD OUR RATE OF DSNT SLOWED, WE WERE TOLD TO LEVEL AT 3000' (WE HAD ALREADY DSNDED THROUGH 2500'). WE IMMEDIATELY CLBED BACK TO 3000'. CTLR ADVISED TFC 1 MI. WE THINK THE 2 ACFT HAD UNDER 500' AND 1 MI SEP. THE OTHER PLT SAID HE SAW US, WE NEVER SAW HIM. DISCUSSION WITH TWR SUPVR AFTER LNDG RESULTED IN PULLING THE TAPES AND RELIEVING THE CTLR FOR REVIEW.
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.