EMB120 flight crew has a loss of separation departing dpa.

Attributes
ACN	702322
Time
Date	200606
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dpa.airport
State Reference	IL
Altitude	agl single value : 3700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 111 flight time total : 7773 flight time type : 445
ASRS Report	702322
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 6000 flight time type : 2000
ASRS Report	702321
Events
Anomaly	conflict : airborne critical non adherence : clearance non adherence : required legal separation other spatial deviation
Independent Detector	other controllerb
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 700
Supplementary
Problem Areas	ATC Human Performance Airspace Structure Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared for takeoff dpa. Controller instructed turn right 240 degrees 'cleared for takeoff.' I performed the takeoff and proceeded to climb runway heading. Tower handed off to departure and I held runway heading. Departure told us to expedite the climb to 4000 ft (initial cleared altitude) as we passed 3700 ft. I complied. Next; we were told to turn 240 degrees (I complied). Then we were told to turn 270 degrees (I complied). We proceeded without further incident. Later we were given a number to call. I called and was informed that I was given 240 degrees at takeoff clearance and read it back; then failed to turn causing our aircraft to pass within 2 mi horizontally and 700 ft vertically of a climbing C172. Discovered problem when we called the TRACON after landing.

Original NASA ASRS Text

Title: EMB120 FLT CREW HAS A LOSS OF SEPARATION DEPARTING DPA.

Narrative: CLRED FOR TKOF DPA. CTLR INSTRUCTED TURN R 240 DEGS 'CLRED FOR TKOF.' I PERFORMED THE TKOF AND PROCEEDED TO CLB RWY HDG. TWR HANDED OFF TO DEP AND I HELD RWY HDG. DEP TOLD US TO EXPEDITE THE CLB TO 4000 FT (INITIAL CLRED ALT) AS WE PASSED 3700 FT. I COMPLIED. NEXT; WE WERE TOLD TO TURN 240 DEGS (I COMPLIED). THEN WE WERE TOLD TO TURN 270 DEGS (I COMPLIED). WE PROCEEDED WITHOUT FURTHER INCIDENT. LATER WE WERE GIVEN A NUMBER TO CALL. I CALLED AND WAS INFORMED THAT I WAS GIVEN 240 DEGS AT TKOF CLRNC AND READ IT BACK; THEN FAILED TO TURN CAUSING OUR ACFT TO PASS WITHIN 2 MI HORIZLY AND 700 FT VERTICALLY OF A CLBING C172. DISCOVERED PROB WHEN WE CALLED THE TRACON AFTER LNDG.

Data retrieved from NASA's ASRS site as of January 2009 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.