Local controller cleared an IFR departure for takeoff without obtaining a release from departure controller and the aircraft conflicted with another IFR aircraft. Local controller did not know that the aircraft was on an IFR flight plan.

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Attributes
ACN	400274
Time
Date	199804
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pne
State Reference	PA
Altitude	msl bound lower : 1000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl tower : pne
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	instruction : instructor other personnel other
Qualification	controller : non radar
Experience	controller non radar : 1
ASRS Report	400274
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : clearance other anomaly other other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 12000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was signed on duty as controller in charge and local controller. I allowed a pre developmental to work the local controller position under my supervision. The pre developmental cleared an aircraft for takeoff. He and I were unaware that the aircraft was on an IFR route! After being alerted to our mistake by phl TRACON, we instructed the aircraft to maintain VFR and pointed out any traffic. The aircraft reported seeing the traffic.

Original NASA ASRS Text

Title: LCL CTLR CLRED AN IFR DEP FOR TKOF WITHOUT OBTAINING A RELEASE FROM DEP CTLR AND THE ACFT CONFLICTED WITH ANOTHER IFR ACFT. LCL CTLR DID NOT KNOW THAT THE ACFT WAS ON AN IFR FLT PLAN.

Narrative: I WAS SIGNED ON DUTY AS CIC AND LCL CTLR. I ALLOWED A PRE DEVELOPMENTAL TO WORK THE LCL CTLR POS UNDER MY SUPERVISION. THE PRE DEVELOPMENTAL CLRED AN ACFT FOR TKOF. HE AND I WERE UNAWARE THAT THE ACFT WAS ON AN IFR RTE! AFTER BEING ALERTED TO OUR MISTAKE BY PHL TRACON, WE INSTRUCTED THE ACFT TO MAINTAIN VFR AND POINTED OUT ANY TFC. THE ACFT RPTED SEEING THE TFC.

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.