Air carrier reported a confliction on departure with an arriving small aircraft.

Attributes
ACN	113706
Time
Date	198906
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mlg
State Reference	FL
Altitude	msl bound lower : 700 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mlb
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	landing other
Route In Use	arrival other
Person 1
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
ASRS Report	113706
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : far other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 500 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X departed runway 27L. An small aircraft Y had called 15 mi west 5 min before and was told to enter left downwind, runway 27L. Prior to takeoff clearance for air carrier X, small aircraft Y had been told to remain south of the departure corridor for runway 27L, and that air carrier traffic will be departing. Approximately 30 seconds after air carrier X departed, small aircraft Y called crossing the interstate highway which is 3 mi west of the airport and runs n-s. Air carrier X called back 3-5 mins later and said that he passed over a small aircraft, opposite direction, at 700' and said that he was climbing to 1000' and that small aircraft Y looked like it was going to land on runway 9R. There was approximately 300' separation between aircraft. I was busy working ground control but was trying to keep up with the situation on local control. I got a lot of this information from reviewing the tape. I believe this situation resulted from the local controller not ensuring visually that the departure corridor was clear and was trusting a pilot who was unfamiliar with the area to enter the pattern correctly.

Original NASA ASRS Text

Title: ACR REPORTED A CONFLICTION ON DEP WITH AN ARRIVING SMA.

Narrative: ACR X DEPARTED RWY 27L. AN SMA Y HAD CALLED 15 MI W 5 MIN BEFORE AND WAS TOLD TO ENTER LEFT DOWNWIND, RWY 27L. PRIOR TO TKOF CLRNC FOR ACR X, SMA Y HAD BEEN TOLD TO REMAIN S OF THE DEP CORRIDOR FOR RWY 27L, AND THAT ACR TFC WILL BE DEPARTING. APPROX 30 SECONDS AFTER ACR X DEPARTED, SMA Y CALLED XING THE INTERSTATE HWY WHICH IS 3 MI W OF THE ARPT AND RUNS N-S. ACR X CALLED BACK 3-5 MINS LATER AND SAID THAT HE PASSED OVER A SMALL ACFT, OPPOSITE DIRECTION, AT 700' AND SAID THAT HE WAS CLIMBING TO 1000' AND THAT SMA Y LOOKED LIKE IT WAS GOING TO LAND ON RWY 9R. THERE WAS APPROX 300' SEPARATION BETWEEN ACFT. I WAS BUSY WORKING GND CTL BUT WAS TRYING TO KEEP UP WITH THE SITUATION ON LCL CTL. I GOT A LOT OF THIS INFO FROM REVIEWING THE TAPE. I BELIEVE THIS SITUATION RESULTED FROM THE LCL CTLR NOT ENSURING VISUALLY THAT THE DEP CORRIDOR WAS CLEAR AND WAS TRUSTING A PLT WHO WAS UNFAMILIAR WITH THE AREA TO ENTER THE PATTERN CORRECTLY.

Data retrieved from NASA's ASRS site as of August 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.