Close proximity cpr light transport commuter light transport on vectors into dtw.

Attributes
ACN	186053
Time
Date	199108
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : crl airport : dtw
State Reference	MI
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 4500 flight time type : 2000
ASRS Report	186053
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 6300 flight time type : 1300
ASRS Report	185820
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation Operational Deviation

Narrative:

Cleveland center issued descent clearance to 12000 ft. Level at 12000 we were given frequency change to detroit approach. Checked in with detroit approach, called level 12000 ft. Detroit approach issued descent clearance to 11000 ft with vector heading 040 degree. Both pilots copied 11000 ft and 11000 was set in autoplt altitude selector. Descent was made to 11000 ft. After several mins, detroit approach called us, 'confirm altitude clearance 12000 ft'. I responded, 'negative, cleared to 11000'. Detroit approach issued an immediate vector turn for us and an immediate vector for a commuter airliner. Traffic in the area was normal. The radio frequency was not cluttered. Transmissions were not being blocked.

Original NASA ASRS Text

Title: CLOSE PROX CPR LTT COMMUTER LTT ON VECTORS INTO DTW.

Narrative: CLEVELAND CENTER ISSUED DSCNT CLRNC TO 12000 FT. LEVEL AT 12000 WE WERE GIVEN FREQ CHANGE TO DETROIT APCH. CHKED IN WITH DETROIT APCH, CALLED LEVEL 12000 FT. DETROIT APCH ISSUED DSCNT CLRNC TO 11000 FT WITH VECTOR HDG 040 DEG. BOTH PLTS COPIED 11000 FT AND 11000 WAS SET IN AUTOPLT ALT SELECTOR. DSCNT WAS MADE TO 11000 FT. AFTER SEVERAL MINS, DETROIT APCH CALLED US, 'CONFIRM ALT CLRNC 12000 FT'. I RESPONDED, 'NEGATIVE, CLRED TO 11000'. DETROIT APCH ISSUED AN IMMEDIATE VECTOR TURN FOR US AND AN IMMEDIATE VECTOR FOR A COMMUTER AIRLINER. TFC IN THE AREA WAS NORMAL. THE RADIO FREQ WAS NOT CLUTTERED. TRANSMISSIONS WERE NOT BEING BLOCKED.

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.