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A C560 captain was given descent clearance and read back wrong altitude. The flight crew had descended 500 ft below assigned, before controller intervened.
| Attributes | |
| ACN | 327120 |
| Time | |
| Date | 199601 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pxr airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 7500 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phx |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 125 flight time total : 11000 flight time type : 1450 |
| ASRS Report | 327120 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Controller stated, as I heard him, descend from 10000 ft to 7000 ft. I said back to the controller, heading 10000 ft for 7000 ft and he acknowledged. At 8400 ft, he asked what altitude for us to maintain, and I stated 7000 ft. He said no, the altitude was 8000 ft. At 7500 ft we climbed back to 8000 ft. He stated 'no problem.' there were no other aircraft in our area. The obvious here is that clearer communications are needed. We try very hard to do it right the first time.
Original NASA ASRS Text
Title: A C560 CAPT WAS GIVEN DSCNT CLRNC AND READ BACK WRONG ALT. THE FLC HAD DSNDED 500 FT BELOW ASSIGNED, BEFORE CTLR INTERVENED.
Narrative: CTLR STATED, AS I HEARD HIM, DSND FROM 10000 FT TO 7000 FT. I SAID BACK TO THE CTLR, HEADING 10000 FT FOR 7000 FT AND HE ACKNOWLEDGED. AT 8400 FT, HE ASKED WHAT ALT FOR US TO MAINTAIN, AND I STATED 7000 FT. HE SAID NO, THE ALT WAS 8000 FT. AT 7500 FT WE CLBED BACK TO 8000 FT. HE STATED 'NO PROB.' THERE WERE NO OTHER ACFT IN OUR AREA. THE OBVIOUS HERE IS THAT CLEARER COMS ARE NEEDED. WE TRY VERY HARD TO DO IT RIGHT THE FIRST TIME.
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.