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An A320 crew, descending into las, disagreed with ATC's instructions, citing the possibility of an overshoot with reference to published crossing restrs.
| Attributes | |
| ACN | 550049 |
| Time | |
| Date | 200206 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | intersection : utare |
| State Reference | NV |
| Altitude | msl bound lower : 8000 msl bound upper : 9100 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : lynsy 1 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 550049 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Airport |
| Primary Problem | ATC Human Performance |
Narrative:
We were descending into las via the lynsy one arrival. The controller came on and said, 'descend via the lynsy one arrival, except maintain eight thousand.' the captain read back the clearance and I continued descent to 8000 ft. Both the captain and I interpreted what was said as an exception to the published step down altitudes. Around 9000 ft the controller came on and clarified that he wanted us to descend via the published altitudes and at utare intersection maintain 8000 ft. The fom contains an example of an exception on a STAR. The example in the fom has a fix associated with an altitude exception. I think wording of 'descend via the lynsy one arrival except cross utare at and maintain 8000 ft,' would have been more clear.
Original NASA ASRS Text
Title: AN A320 CREW, DSNDING INTO LAS, DISAGREED WITH ATC'S INSTRUCTIONS, CITING THE POSSIBILITY OF AN OVERSHOOT WITH REF TO PUBLISHED XING RESTRS.
Narrative: WE WERE DSNDING INTO LAS VIA THE LYNSY ONE ARR. THE CTLR CAME ON AND SAID, 'DSND VIA THE LYNSY ONE ARR, EXCEPT MAINTAIN EIGHT THOUSAND.' THE CAPT READ BACK THE CLRNC AND I CONTINUED DSCNT TO 8000 FT. BOTH THE CAPT AND I INTERPRETED WHAT WAS SAID AS AN EXCEPTION TO THE PUBLISHED STEP DOWN ALTS. AROUND 9000 FT THE CTLR CAME ON AND CLARIFIED THAT HE WANTED US TO DSND VIA THE PUBLISHED ALTS AND AT UTARE INTXN MAINTAIN 8000 FT. THE FOM CONTAINS AN EXAMPLE OF AN EXCEPTION ON A STAR. THE EXAMPLE IN THE FOM HAS A FIX ASSOCIATED WITH AN ALT EXCEPTION. I THINK WORDING OF 'DSND VIA THE LYNSY ONE ARR EXCEPT CROSS UTARE AT AND MAINTAIN 8000 FT,' WOULD HAVE BEEN MORE CLR.
Data retrieved from NASA's ASRS site as of July 2007 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.