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Altitude deviation altitude undershot, the ARTCC radar controller cleared the air carrier to a lower altitude, but the crew thought that it was at their discretion.
| Attributes | |
| ACN | 302090 |
| Time | |
| Date | 199504 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gnv |
| State Reference | FL |
| Altitude | msl bound lower : 18000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 10000 flight time type : 5000 |
| ASRS Report | 302090 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : published procedure non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were descending into tpa on the dades 1 arrival. The arrival has expect clrncs for gnv at FL270 and marvi at 13000 ft. Center cleared us to cross gnv at FL270 and then descend to FL180. I asked the captain to verify if FL180 was discretion. He replied it was since ATC really didn't emphasize he needed us at FL180. We were on the arrival, discretionary dscnts were the norm and the TCASII was clear. Consequently I didn't ask again to verify the altitude. I guess I should have because a few mins later ATC asked us why we were still at FL270. We apologized. He replied no problem as there was no conflict of any sort. The next time I will assist on verification.
Original NASA ASRS Text
Title: ALTDEV ALT UNDERSHOT, THE ARTCC RADAR CTLR CLRED THE ACR TO A LOWER ALT, BUT THE CREW THOUGHT THAT IT WAS AT THEIR DISCRETION.
Narrative: WE WERE DSNDING INTO TPA ON THE DADES 1 ARR. THE ARR HAS EXPECT CLRNCS FOR GNV AT FL270 AND MARVI AT 13000 FT. CTR CLRED US TO CROSS GNV AT FL270 AND THEN DSND TO FL180. I ASKED THE CAPT TO VERIFY IF FL180 WAS DISCRETION. HE REPLIED IT WAS SINCE ATC REALLY DIDN'T EMPHASIZE HE NEEDED US AT FL180. WE WERE ON THE ARR, DISCRETIONARY DSCNTS WERE THE NORM AND THE TCASII WAS CLR. CONSEQUENTLY I DIDN'T ASK AGAIN TO VERIFY THE ALT. I GUESS I SHOULD HAVE BECAUSE A FEW MINS LATER ATC ASKED US WHY WE WERE STILL AT FL270. WE APOLOGIZED. HE REPLIED NO PROB AS THERE WAS NO CONFLICT OF ANY SORT. THE NEXT TIME I WILL ASSIST ON VERIFICATION.
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.