Deviation from clearance by reporter caused a potential traffic conflict which was handled by ATC.

Attributes
ACN	433150
Time
Date	199904
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ptk.airport
State Reference	MI
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ptk.tower
Operator	general aviation : corporate
Make Model Name	Citation I/SP
Operating Under FAR Part	Part 91
Navigation In Use	Other
Flight Phase	climbout : initial
Route In Use	departure sid : ptk 8 (vector)
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d21.tracon
Operator	Other
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Navigation In Use	Other
Flight Phase	other
Flight Plan	VFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 125 flight time total : 8000 flight time type : 2500
ASRS Report	433150
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera other controllerb
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Clearance from ptk was pontiac 8 departure, tycob, direct eri (destination). Tower controller stated 'cleared for takeoff, runway 27L.' I acknowledged, 'cleared for takeoff, runway 27L.' the SID states 'runways 27L/right and climb runway heading to 1400 ft before turning. Thence departure via vectors to join the assigned airway or radial, then proceed to the assigned departure fix, then via assigned route.' we (crew) departed ptk, out of 1400 ft, we turned to tycob and continued to climb to 3000 ft. Tower controller then asked if we were on frequency. I responded roger and was told to turn immediately to 090 degree heading and that he had given us runway heading, contact departure on 124.9. Departure requested we call landline and thanked another pilot for his quick turn. I did not catch type or tail number. Tower controller had not given us runway heading, otherwise we would have complied with that instruction rather than following SID.

Original NASA ASRS Text

Title: DEV FROM CLRNC BY RPTR CAUSED A POTENTIAL TFC CONFLICT WHICH WAS HANDLED BY ATC.

Narrative: CLRNC FROM PTK WAS PONTIAC 8 DEP, TYCOB, DIRECT ERI (DEST). TWR CTLR STATED 'CLRED FOR TKOF, RWY 27L.' I ACKNOWLEDGED, 'CLRED FOR TKOF, RWY 27L.' THE SID STATES 'RWYS 27L/R AND CLB RWY HDG TO 1400 FT BEFORE TURNING. THENCE DEP VIA VECTORS TO JOIN THE ASSIGNED AIRWAY OR RADIAL, THEN PROCEED TO THE ASSIGNED DEP FIX, THEN VIA ASSIGNED RTE.' WE (CREW) DEPARTED PTK, OUT OF 1400 FT, WE TURNED TO TYCOB AND CONTINUED TO CLB TO 3000 FT. TWR CTLR THEN ASKED IF WE WERE ON FREQ. I RESPONDED ROGER AND WAS TOLD TO TURN IMMEDIATELY TO 090 DEG HDG AND THAT HE HAD GIVEN US RWY HDG, CONTACT DEP ON 124.9. DEP REQUESTED WE CALL LANDLINE AND THANKED ANOTHER PLT FOR HIS QUICK TURN. I DID NOT CATCH TYPE OR TAIL NUMBER. TWR CTLR HAD NOT GIVEN US RWY HDG, OTHERWISE WE WOULD HAVE COMPLIED WITH THAT INSTRUCTION RATHER THAN FOLLOWING SID.

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.