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Air carrier X assigned heading 300 degrees, pilot read back FL300 roger. Loss of separation occurred with traffic at FL290.
| Attributes | |
| ACN | 437552 |
| Time | |
| Date | 199905 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : spa.vortac |
| State Reference | NC |
| Altitude | msl bound lower : 29000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : instrument |
| Experience | controller limited radar : 15 controller non radar : 15 controller radar : 15 controller time certified in position1 : 9 |
| ASRS Report | 437552 |
| Person 2 | |
| Affiliation | company : air carrier company other government : faa government other other |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Miss Distance | horizontal : 5000 vertical : 1200 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft assigned 'heading 300 degrees.' read back 'FL300, roger?' controller responded 'affirmative.' this controller relieved from sector. New controller noticed air carrier X at FL300 and turned air carrier Y (at FL290) to miss aircraft #1. Aircraft #1 asked if climbing to FL310, 'no, I was assigned FL300.' aircraft #1 now turned and climbed but separation lost between 4 1/2 - 5 mi. An air carrier pilot should question issuance of FL330, FL320, etc.
Original NASA ASRS Text
Title: ACR X ASSIGNED HDG 300 DEGS, PLT READ BACK FL300 ROGER. LOSS OF SEPARATION OCCURRED WITH TFC AT FL290.
Narrative: ACFT ASSIGNED 'HDG 300 DEGS.' READ BACK 'FL300, ROGER?' CTLR RESPONDED 'AFFIRMATIVE.' THIS CTLR RELIEVED FROM SECTOR. NEW CTLR NOTICED ACR X AT FL300 AND TURNED ACR Y (AT FL290) TO MISS ACFT #1. ACFT #1 ASKED IF CLBING TO FL310, 'NO, I WAS ASSIGNED FL300.' ACFT #1 NOW TURNED AND CLBED BUT SEPARATION LOST BTWN 4 1/2 - 5 MI. AN ACR PLT SHOULD QUESTION ISSUANCE OF FL330, FL320, ETC.
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.