Air carrier climbed through occupied altitude resulting in less than standard separation.

Attributes
ACN	129963
Time
Date	198912
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw tower : dtw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : initial
Route In Use	departure sid : sid
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 6000
ASRS Report	129096
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 45 flight time total : 7000
ASRS Report	130174
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

The copilot copied and read back our ATC clearance which included a full route, followed by 'maintain 12000, expect 290 10 mins after departure.' the departure briefing during the before takeoff checklist included a review of our initial clearance (including climb to 12000'). After a runway 21C routine takeoff, tower instructed to contact departure (copilot flying, me [captain] working radios). Initial contact to departure was '...2400, climbing to 1-2-thousand.' acknowledgement from departure included instructions to turn left to 080 degrees. When climbing through approximately 10800', controller advised us of traffic at 12 O'clock and 11000'. I advised that we were climbing to 12000' (by this time we were already through 11000'). The controller advised an immediate right turn, which we executed and simultaneously saw traffic pass off to our left. Supplemental information from acn 130174: I received a full route clearance and read it back. Departure was metropolitan 7, climb and maintain 12000', expect FL290 10 mins after departure. On taxi-out captain questioned the 12000'. I checked my written clearance that I copied and had read back to clearance.

Original NASA ASRS Text

Title: ACR CLIMBED THROUGH OCCUPIED ALT RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: THE COPLT COPIED AND READ BACK OUR ATC CLRNC WHICH INCLUDED A FULL ROUTE, FOLLOWED BY 'MAINTAIN 12000, EXPECT 290 10 MINS AFTER DEP.' THE DEP BRIEFING DURING THE BEFORE TKOF CHKLIST INCLUDED A REVIEW OF OUR INITIAL CLRNC (INCLUDING CLB TO 12000'). AFTER A RWY 21C ROUTINE TKOF, TWR INSTRUCTED TO CONTACT DEP (COPLT FLYING, ME [CAPT] WORKING RADIOS). INITIAL CONTACT TO DEP WAS '...2400, CLBING TO 1-2-THOUSAND.' ACKNOWLEDGEMENT FROM DEP INCLUDED INSTRUCTIONS TO TURN LEFT TO 080 DEGS. WHEN CLBING THROUGH APPROX 10800', CTLR ADVISED US OF TFC AT 12 O'CLOCK AND 11000'. I ADVISED THAT WE WERE CLBING TO 12000' (BY THIS TIME WE WERE ALREADY THROUGH 11000'). THE CTLR ADVISED AN IMMEDIATE RIGHT TURN, WHICH WE EXECUTED AND SIMULTANEOUSLY SAW TFC PASS OFF TO OUR LEFT. SUPPLEMENTAL INFO FROM ACN 130174: I RECEIVED A FULL ROUTE CLRNC AND READ IT BACK. DEP WAS METRO 7, CLB AND MAINTAIN 12000', EXPECT FL290 10 MINS AFTER DEP. ON TAXI-OUT CAPT QUESTIONED THE 12000'. I CHKED MY WRITTEN CLRNC THAT I COPIED AND HAD READ BACK TO CLRNC.

Data retrieved from NASA's ASRS site as of August 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.