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ZID controller experienced operational error at FL240 with 2 climbing aircraft. Mode C altitude readout misread and conflicting altitude issued.
| Attributes | |
| ACN | 720582 |
| Time | |
| Date | 200612 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : rod.vortac |
| State Reference | OH |
| Altitude | agl single value : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc tower : hwd.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 720582 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 29400 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 climbing eastbound. Aircraft #2 climbing nwbound. Controller incorrectly read mode C of aircraft #1 as leaving FL260. FL260 then issued to aircraft #2. Vertical and lateral separation then lost.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL240 WITH 2 CLBING ACFT. MODE C ALT READOUT MISREAD AND CONFLICTING ALT ISSUED.
Narrative: ACFT #1 CLBING EBOUND. ACFT #2 CLBING NWBOUND. CTLR INCORRECTLY READ MODE C OF ACFT #1 AS LEAVING FL260. FL260 THEN ISSUED TO ACFT #2. VERT AND LATERAL SEPARATION THEN LOST.
Data retrieved from NASA's ASRS site as of January 2009 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.