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Similar a/north resulted in widebody transport taking clearance for same company large transport causing potential conflict.
| Attributes | |
| ACN | 87580 |
| Time | |
| Date | 198805 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : iah |
| State Reference | TX |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 8000 |
| ASRS Report | 87580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 87581 |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
I was acm on air carrier a flight wyz las-iah and observed the following: aircraft involved air carrier a flight dwz, air carrier a flight xyz and air carrier a flight wyz. Flight xyz accepted a clearance from hou center to fly 030 degrees heading FL290. Center confirmed. Approximately 1 min later center issued a clearance to wyz to immediately turn to 030 degrees and descend to FL280. This was followed by a call to xyz to climb to FL310 and turn to 130 degrees immediately. Confusion by controllers on call signs continued after handoff to next controller. Supplemental information from acn 88189: arrs into iah on center frequency. 3 aircraft had similar callsigns all same air carrier, xyz, wyz and dwz. The cugar 4 arrival was not active due humble VOR OTS. Controller workload therefore high during arrival rush. We (xyz) apparently copied heading instructions for wyz. We acknowledged as xyz. Controller didn't catch mistake, issued same heading to us. We felt he simply confirmed first clearance. Few mins later controller told us to turn right, climb to FL310 to avoid potential conflict. Nothing more was talked about on radio.
Original NASA ASRS Text
Title: SIMILAR A/N RESULTED IN WDB TAKING CLRNC FOR SAME COMPANY LGT CAUSING POTENTIAL CONFLICT.
Narrative: I WAS ACM ON ACR A FLT WYZ LAS-IAH AND OBSERVED THE FOLLOWING: ACFT INVOLVED ACR A FLT DWZ, ACR A FLT XYZ AND ACR A FLT WYZ. FLT XYZ ACCEPTED A CLRNC FROM HOU CENTER TO FLY 030 DEGS HDG FL290. CENTER CONFIRMED. APPROX 1 MIN LATER CENTER ISSUED A CLRNC TO WYZ TO IMMEDIATELY TURN TO 030 DEGS AND DSND TO FL280. THIS WAS FOLLOWED BY A CALL TO XYZ TO CLB TO FL310 AND TURN TO 130 DEGS IMMEDIATELY. CONFUSION BY CTLRS ON CALL SIGNS CONTINUED AFTER HDOF TO NEXT CTLR. SUPPLEMENTAL INFO FROM ACN 88189: ARRS INTO IAH ON CENTER FREQ. 3 ACFT HAD SIMILAR CALLSIGNS ALL SAME ACR, XYZ, WYZ AND DWZ. THE CUGAR 4 ARR WAS NOT ACTIVE DUE HUMBLE VOR OTS. CTLR WORKLOAD THEREFORE HIGH DURING ARR RUSH. WE (XYZ) APPARENTLY COPIED HDG INSTRUCTIONS FOR WYZ. WE ACKNOWLEDGED AS XYZ. CTLR DIDN'T CATCH MISTAKE, ISSUED SAME HDG TO US. WE FELT HE SIMPLY CONFIRMED FIRST CLRNC. FEW MINS LATER CTLR TOLD US TO TURN RIGHT, CLB TO FL310 TO AVOID POTENTIAL CONFLICT. NOTHING MORE WAS TALKED ABOUT ON RADIO.
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.