C207 executes go around when anc local control issues takeoff clearance to a C185.

Attributes
ACN	533493
Time
Date	200112
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : anc.airport
State Reference	AK
Altitude	msl single value : 40
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : myf.tower
Operator	general aviation : personal
Make Model Name	Skywagon 185
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Aircraft 2
Controlling Facilities	tower : anc.tower
Operator	common carrier : air taxi
Make Model Name	Cessna Stationair/Turbo Stationair 7/8
Operating Under FAR Part	Part 135
Flight Phase	descent : approach landing : go around
Route In Use	approach : visual
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
ASRS Report	533495
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	non adherence : required legal separation non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : executed go around
Miss Distance	horizontal : 15 vertical : 40
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I had cleared a C207 5 mi out to land runway 6. A few mins later, C185 called for a intersection departure. I cleared him for takeoff. About 23 seconds later, I heard the C207 motor rev and saw him go around. I had the C207 progress strip in my hand, not on the strip board. Thank god the C207 pilot was watching.

Original NASA ASRS Text

Title: C207 EXECUTES GAR WHEN ANC LC ISSUES TKOF CLRNC TO A C185.

Narrative: I HAD CLRED A C207 5 MI OUT TO LAND RWY 6. A FEW MINS LATER, C185 CALLED FOR A INTXN DEP. I CLRED HIM FOR TKOF. ABOUT 23 SECS LATER, I HEARD THE C207 MOTOR REV AND SAW HIM GAR. I HAD THE C207 PROGRESS STRIP IN MY HAND, NOT ON THE STRIP BOARD. THANK GOD THE C207 PLT WAS WATCHING.

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.