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ZID controller experienced operational error at approximately fl 260 when amended altitude clearance was issued but not acknowledged by the flight crew.
| Attributes | |
| ACN | 798778 |
| Time | |
| Date | 200808 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ape.vortac |
| State Reference | OH |
| Altitude | msl single value : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 18 |
| ASRS Report | 798778 |
| 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 : 15540 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 was descending into pit; leveled at FL270. Aircraft #2 was climbing off of cle; over ape VOR to FL280. Aircraft #2's altitude was amended to FL260 to stay beneath aircraft #1. I thought I got a readback and aircraft #2 was shipped to the next sector. When aircraft #2 was seen climbing through FL261; the next controller gave them an immediate descent to FL260. Reviewing the tapes showed that I had not gotten a readback on clearance of aircraft #2 to FL260.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT APPROX FL 260 WHEN AMENDED ALT CLRNC WAS ISSUED BUT NOT ACKNOWLEDGED BY THE FLT CREW.
Narrative: ACFT #1 WAS DSNDING INTO PIT; LEVELED AT FL270. ACFT #2 WAS CLBING OFF OF CLE; OVER APE VOR TO FL280. ACFT #2'S ALT WAS AMENDED TO FL260 TO STAY BENEATH ACFT #1. I THOUGHT I GOT A READBACK AND ACFT #2 WAS SHIPPED TO THE NEXT SECTOR. WHEN ACFT #2 WAS SEEN CLBING THROUGH FL261; THE NEXT CTLR GAVE THEM AN IMMEDIATE DSCNT TO FL260. REVIEWING THE TAPES SHOWED THAT I HAD NOT GOTTEN A READBACK ON CLRNC OF ACFT #2 TO FL260.
Data retrieved from NASA's ASRS site as of May 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.