 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ZOB controller experienced operational error at approximately FL340 when failing to hear wrong altitude readback resulting in traffic climbing to occupied altitude.
| Attributes | |
| ACN | 786053 |
| Time | |
| Date | 200805 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pkb.airport |
| State Reference | PA |
| Altitude | msl bound lower : 34000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : personal |
| Make Model Name | Citationjet C525/C526 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : trainee |
| Qualification | controller : developmental |
| Experience | controller non radar : 2 controller radar : 2 |
| ASRS Report | 786053 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude 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 flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21600 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We accepted a handoff on aircraft X believing he was climbing to FL340 with traffic above at FL350. At the time of aircraft X's check-on; I was figuring spacing that needed to be done; and became aware of a possible airspace violation involving ZID; the sector below; and aircraft X. Aircraft X had read back he was climbing to FL340 to ZID; then shortly after checked on with us climbing to FL350. We missed the readback because of the 2 distrs. I called traffic and used proper phraseology; stating that the traffic was '1000 ft above' his assigned altitude. The pilot never questioned his altitude assignment; stated that he had traffic in sight; and continued to climb to FL350. The conflict alert went off and my instructor issued evasive clrncs.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT APPROX FL340 WHEN FAILING TO HEAR WRONG ALT READBACK RESULTING IN TFC CLIMBING TO OCCUPIED ALT.
Narrative: WE ACCEPTED A HDOF ON ACFT X BELIEVING HE WAS CLBING TO FL340 WITH TFC ABOVE AT FL350. AT THE TIME OF ACFT X'S CHK-ON; I WAS FIGURING SPACING THAT NEEDED TO BE DONE; AND BECAME AWARE OF A POSSIBLE AIRSPACE VIOLATION INVOLVING ZID; THE SECTOR BELOW; AND ACFT X. ACFT X HAD READ BACK HE WAS CLBING TO FL340 TO ZID; THEN SHORTLY AFTER CHKED ON WITH US CLBING TO FL350. WE MISSED THE READBACK BECAUSE OF THE 2 DISTRS. I CALLED TFC AND USED PROPER PHRASEOLOGY; STATING THAT THE TFC WAS '1000 FT ABOVE' HIS ASSIGNED ALT. THE PLT NEVER QUESTIONED HIS ALT ASSIGNMENT; STATED THAT HE HAD TFC IN SIGHT; AND CONTINUED TO CLB TO FL350. THE CONFLICT ALERT WENT OFF AND MY INSTRUCTOR ISSUED EVASIVE CLRNCS.
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.