C414 receives a TCAS ii TA from citation traffic in osu class D.

Attributes
ACN	581402
Time
Date	200305
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cmh.airport
State Reference	OH
Altitude	msl single value : 2500
Aircraft 1
Controlling Facilities	tower : cmh.tower tower : ttn.tower
Operator	general aviation : personal
Make Model Name	Chancellor 414A & C414
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : osu.tower
Make Model Name	Cessna Citation Undifferentiated or Other Model
Flight Phase	cruise : level
Person 1
Affiliation	other
Function	flight crew : single pilot oversight : pic
Qualification	pilot : atp
Experience	flight time total : 5000 flight time type : 3000
ASRS Report	581402
Person 2
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact other
Miss Distance	vertical : 600
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Departed cmh (port columbus international, columbus, oh) VFR to nearby osu. Clearance was 2500 ft, direct osu, with assigned discrete transponder code and departure frequency. After takeoff, tower cleared me for a right turn direct to osu. Subsequently tower requested I report when osu was in sight. There was no handoff to departure. As I entered osu class D airspace, I attempted to communicate with cmh tower, but was unable due to frequency congestion. I experienced a TA on the TCASII, indicating close traffic 600 ft above. I initiated a descent for safe traffic separation. Unable to establish communication with cmh tower, I contacted osu tower. Osu tower was alarmed as the citation traffic just passing overhead had made a visual report of my presence. Osu tower vectored me for landing at osu. While airborne, I briefly explained to osu tower events associated with my arrival.

Original NASA ASRS Text

Title: C414 RECEIVES A TCAS II TA FROM CITATION TRAFFIC IN OSU CLASS D.

Narrative: DEPARTED CMH (PORT COLUMBUS INTL, COLUMBUS, OH) VFR TO NEARBY OSU. CLRNC WAS 2500 FT, DIRECT OSU, WITH ASSIGNED DISCRETE XPONDER CODE AND DEP FREQ. AFTER TKOF, TWR CLRED ME FOR A R TURN DIRECT TO OSU. SUBSEQUENTLY TWR REQUESTED I RPT WHEN OSU WAS IN SIGHT. THERE WAS NO HDOF TO DEP. AS I ENTERED OSU CLASS D AIRSPACE, I ATTEMPTED TO COMMUNICATE WITH CMH TWR, BUT WAS UNABLE DUE TO FREQ CONGESTION. I EXPERIENCED A TA ON THE TCASII, INDICATING CLOSE TFC 600 FT ABOVE. I INITIATED A DSCNT FOR SAFE TFC SEPARATION. UNABLE TO ESTABLISH COM WITH CMH TWR, I CONTACTED OSU TWR. OSU TWR WAS ALARMED AS THE CITATION TFC JUST PASSING OVERHEAD HAD MADE A VISUAL RPT OF MY PRESENCE. OSU TWR VECTORED ME FOR LNDG AT OSU. WHILE AIRBORNE, I BRIEFLY EXPLAINED TO OSU TWR EVENTS ASSOCIATED WITH MY ARR.

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.