C560 altitude deviation near lou.

Attributes
ACN	450458
Time
Date	199909
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lou.airport
State Reference	KY
Altitude	msl bound lower : 18000 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	Citation V
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 1000
ASRS Report	450458
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera other flight crewa
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

The copilot was flying and I was PNF. We were in cruise at FL200 33 mi southwest of nabb, when I heard ZID, 'descend and cross sargo at 11000 ft' so I read back descend and cross sargo at 11000 ft, and we started down. Passing FL180, ZID asked what our altitude was, and I read back descending through FL180 to cross sargo at 11000 ft. Center came back and said our last clearance was FL200. I got back on the radio and said, 'I heard and read back cross sargo at 11000 ft.' center said, 'that was for other aircraft' and he got their readback. I asked if he wanted us to climb back up to FL200 and he said, 'no, descend to 17000 ft.' and then he switched us to a new controller. I asked if he wanted us to call when we got on the ground and he said, 'no, no problem.' we completed the flight. I believe there was a miscom on the controller's part. We started down after there was no correction of my readback.

Original NASA ASRS Text

Title: C560 ALTDEV NEAR LOU.

Narrative: THE COPLT WAS FLYING AND I WAS PNF. WE WERE IN CRUISE AT FL200 33 MI SW OF NABB, WHEN I HEARD ZID, 'DSND AND CROSS SARGO AT 11000 FT' SO I READ BACK DSND AND CROSS SARGO AT 11000 FT, AND WE STARTED DOWN. PASSING FL180, ZID ASKED WHAT OUR ALT WAS, AND I READ BACK DSNDING THROUGH FL180 TO CROSS SARGO AT 11000 FT. CTR CAME BACK AND SAID OUR LAST CLRNC WAS FL200. I GOT BACK ON THE RADIO AND SAID, 'I HEARD AND READ BACK CROSS SARGO AT 11000 FT.' CTR SAID, 'THAT WAS FOR OTHER ACFT' AND HE GOT THEIR READBACK. I ASKED IF HE WANTED US TO CLB BACK UP TO FL200 AND HE SAID, 'NO, DSND TO 17000 FT.' AND THEN HE SWITCHED US TO A NEW CTLR. I ASKED IF HE WANTED US TO CALL WHEN WE GOT ON THE GND AND HE SAID, 'NO, NO PROB.' WE COMPLETED THE FLT. I BELIEVE THERE WAS A MISCOM ON THE CTLR'S PART. WE STARTED DOWN AFTER THERE WAS NO CORRECTION OF MY READBACK.

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.