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ZLA controller experienced operational error at approximately FL250 when incorrect readback was not heard and aircraft initiated climb to conflicting altitude.
| Attributes | |
| ACN | 739905 |
| Time | |
| Date | 200705 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : las.airport |
| State Reference | NV |
| Altitude | msl single value : 25200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.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 |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | general aviation : personal |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller time certified in position2 : 3 |
| ASRS Report | 739905 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : company policies |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 16800 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
C550 climbing out of henderson; nv; was leaving FL240 for FL330. B737 climbing out of las was within 5 mi so I used altitude leaving and climbed B737 to FL240. B737 read back FL340. Our frequencys are notoriously bad and have been reported so for months. I thought he said 240 and B737 climbed through FL240 to FL250. Once noticing this I stopped his climb to FL250. Something should be done with these horrible frequencys!
Original NASA ASRS Text
Title: ZLA CTLR EXPERIENCED OPERROR AT APPROX FL250 WHEN INCORRECT READBACK WAS NOT HEARD AND ACFT INITIATED CLIMB TO CONFLICTING ALT.
Narrative: C550 CLBING OUT OF HENDERSON; NV; WAS LEAVING FL240 FOR FL330. B737 CLBING OUT OF LAS WAS WITHIN 5 MI SO I USED ALT LEAVING AND CLBED B737 TO FL240. B737 READ BACK FL340. OUR FREQS ARE NOTORIOUSLY BAD AND HAVE BEEN RPTED SO FOR MONTHS. I THOUGHT HE SAID 240 AND B737 CLBED THROUGH FL240 TO FL250. ONCE NOTICING THIS I STOPPED HIS CLB TO FL250. SOMETHING SHOULD BE DONE WITH THESE HORRIBLE FREQS!
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.