GA small aircraft on vectors at rks initiates approach without clearance.

Attributes
ACN	160730
Time
Date	199010
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rks
State Reference	WY
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach landing other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 3400
ASRS Report	160730
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : weather non adherence : far non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	other other
Consequence	faa : investigated
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I requested a vector to the ILS from sll center was given a heading to intercept. The needles came in like I was going to go through the localizer. I started the turn and at the same time called center and asked 'verify cleared for the approach?' center said 'negative.' I then started a turn back. I was less then 15-20 degree in the turn then center said 'turn 360 degree, I have traffic departing rock springs, say your position, then say your heading.' I repeated that I was in the turn assigned. He then asked 'what heading are you going through.' I gave a position, then I shot the approach and landed. Center didn't say anything about the approach, but the jet Y that departed asked for my north number from center. I don't feel that there was a conflict. I know that I shouldn't have started a turn, but I received a vector for the ILS and started the turn when the needle came alive. I feel that this was a miscom between center and myself. Also, there was ice and I was very anxious to be on the ground.

Original NASA ASRS Text

Title: GA SMA ON VECTORS AT RKS INITIATES APCH WITHOUT CLRNC.

Narrative: I REQUESTED A VECTOR TO THE ILS FROM SLL CTR WAS GIVEN A HDG TO INTERCEPT. THE NEEDLES CAME IN LIKE I WAS GOING TO GO THROUGH THE LOC. I STARTED THE TURN AND AT THE SAME TIME CALLED CTR AND ASKED 'VERIFY CLRED FOR THE APCH?' CTR SAID 'NEGATIVE.' I THEN STARTED A TURN BACK. I WAS LESS THEN 15-20 DEG IN THE TURN THEN CTR SAID 'TURN 360 DEG, I HAVE TFC DEPARTING ROCK SPRINGS, SAY YOUR POS, THEN SAY YOUR HDG.' I REPEATED THAT I WAS IN THE TURN ASSIGNED. HE THEN ASKED 'WHAT HDG ARE YOU GOING THROUGH.' I GAVE A POS, THEN I SHOT THE APCH AND LANDED. CTR DIDN'T SAY ANYTHING ABOUT THE APCH, BUT THE JET Y THAT DEPARTED ASKED FOR MY N NUMBER FROM CTR. I DON'T FEEL THAT THERE WAS A CONFLICT. I KNOW THAT I SHOULDN'T HAVE STARTED A TURN, BUT I RECEIVED A VECTOR FOR THE ILS AND STARTED THE TURN WHEN THE NEEDLE CAME ALIVE. I FEEL THAT THIS WAS A MISCOM BTWN CTR AND MYSELF. ALSO, THERE WAS ICE AND I WAS VERY ANXIOUS TO BE ON THE GND.

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.