C650 crew received clearance from ZAU to descend from FL390 to FL330. Pilot believed he had a clearance to FL300. When the C650 descended through FL330, it conflicted with a HS25 in the area.

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Attributes
ACN	400512
Time
Date	199804
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jot
State Reference	IL
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	general aviation : corporate
Make Model Name	Citation III, VI, VII
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other enroute other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 7000 flight time type : 40
ASRS Report	400517
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : far non adherence : required legal separation
Independent Detector	other flight crewa other other : unspecified atc
Resolutory Action	controller : issued new clearance none taken : detected after the fact other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft #1 was cleared from FL390 to FL330 with crossing restr 30 NM south of jot. Captain acknowledged altitude clearance. Approximately 3 mi later descent was initiated and first officer reported 'aircraft #1 departing FL390 for FL300.' ZAU acknowledged with 'roger'. As aircraft #1 descended through FL310 TCASII alerted. Aircraft #1 was leveled and call made to ATC with traffic conflict. ATC saw traffic and advised we were clear of traffic. Captain was given a phone number to contact ZAU when landing at mke. Phone call was handled by the ATC representative and information was given to her of what occurred. She asked for and was given name, address, and certificate number of the captain. A later phone call was made to the ATC representative when we returned to home base jan. At that time, we were informed that no further action would be taken against the flight crew. During their review of the tapes, it was determined to be a controller error due to the fact we reported, out of FL390 for FL300 and it was acknowledged by ZAU.

Original NASA ASRS Text

Title: C650 CREW RECEIVED CLRNC FROM ZAU TO DSND FROM FL390 TO FL330. PLT BELIEVED HE HAD A CLRNC TO FL300. WHEN THE C650 DSNDED THROUGH FL330, IT CONFLICTED WITH A HS25 IN THE AREA.

Narrative: ACFT #1 WAS CLRED FROM FL390 TO FL330 WITH XING RESTR 30 NM S OF JOT. CAPT ACKNOWLEDGED ALT CLRNC. APPROX 3 MI LATER DSCNT WAS INITIATED AND FO RPTED 'ACFT #1 DEPARTING FL390 FOR FL300.' ZAU ACKNOWLEDGED WITH 'ROGER'. AS ACFT #1 DSNDED THROUGH FL310 TCASII ALERTED. ACFT #1 WAS LEVELED AND CALL MADE TO ATC WITH TFC CONFLICT. ATC SAW TFC AND ADVISED WE WERE CLR OF TFC. CAPT WAS GIVEN A PHONE NUMBER TO CONTACT ZAU WHEN LNDG AT MKE. PHONE CALL WAS HANDLED BY THE ATC REPRESENTATIVE AND INFO WAS GIVEN TO HER OF WHAT OCCURRED. SHE ASKED FOR AND WAS GIVEN NAME, ADDRESS, AND CERTIFICATE NUMBER OF THE CAPT. A LATER PHONE CALL WAS MADE TO THE ATC REPRESENTATIVE WHEN WE RETURNED TO HOME BASE JAN. AT THAT TIME, WE WERE INFORMED THAT NO FURTHER ACTION WOULD BE TAKEN AGAINST THE FLC. DURING THEIR REVIEW OF THE TAPES, IT WAS DETERMINED TO BE A CTLR ERROR DUE TO THE FACT WE RPTED, OUT OF FL390 FOR FL300 AND IT WAS ACKNOWLEDGED BY ZAU.

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.