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ZLA controller described TCAS event when incorrect descent altitude was issued and readback was missed.
| Attributes | |
| ACN | 783815 |
| Time | |
| Date | 200804 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ehf.vortac |
| State Reference | CA |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| 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 | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 30 controller time certified in position1 : 17 |
| ASRS Report | 783815 |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I issued a bad clearance to aircraft #1. Issued descent to FL340; meant to descend to FL350. Pilot read back FL340 and I missed the error.
Original NASA ASRS Text
Title: ZLA CTLR DESCRIBED TCAS EVENT WHEN INCORRECT DESCENT ALT WAS ISSUED AND READBACK WAS MISSED.
Narrative: I ISSUED A BAD CLRNC TO ACFT #1. ISSUED DSCNT TO FL340; MEANT TO DSND TO FL350. PLT READ BACK FL340 AND I MISSED THE ERROR.
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.