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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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L30 controller experienced operational error at approximately 5700 ft when failing to hear incorrect altitude clearance readback.
| Attributes | |
| ACN | 675966 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : las.airport |
| State Reference | NV |
| Altitude | msl bound lower : 5700 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | general aviation : personal |
| Make Model Name | Chancellor 414A & C414 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | general aviation : corporate |
| Make Model Name | PA-31 Navajo Chieftan/Mojave/Navajo T1020 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller limited radar : 7 controller military : 6 controller non radar : 7 controller radar : 18 |
| ASRS Report | 675966 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
C414 was outbound from las on 166 degree radial; instructed to maintain 5000 ft. PA31 was inbound to vgt at 6000 ft. C414 was issued traffic opposite direction at 6000 ft and was re-instructed to maintain 5000 ft. C414 read back climbing 6000 ft. I thought he was repeating what I said. C414 then climbed into the path of PA31. I observed the climb and immediately instructed C414 to descend to 5000 ft; which he did. Aircraft reported that they had each other in sight.
Original NASA ASRS Text
Title: L30 CTLR EXPERIENCED OPERROR AT APPROX 5700 FT WHEN FAILING TO HEAR INCORRECT ALT CLRNC READBACK.
Narrative: C414 WAS OUTBOUND FROM LAS ON 166 DEG RADIAL; INSTRUCTED TO MAINTAIN 5000 FT. PA31 WAS INBOUND TO VGT AT 6000 FT. C414 WAS ISSUED TFC OPPOSITE DIRECTION AT 6000 FT AND WAS RE-INSTRUCTED TO MAINTAIN 5000 FT. C414 READ BACK CLBING 6000 FT. I THOUGHT HE WAS REPEATING WHAT I SAID. C414 THEN CLBED INTO THE PATH OF PA31. I OBSERVED THE CLB AND IMMEDIATELY INSTRUCTED C414 TO DSND TO 5000 FT; WHICH HE DID. ACFT RPTED THAT THEY HAD EACH OTHER IN SIGHT.
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.