<< >> NASA ASRS Report 137523, February 1990

Aircraft departure conflicted with another IFR aircraft in the control zone resulting in less than standard separation.

Attributes
ACN	137523
Time
Date	199002
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ktn
State Reference	AK
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Helicopter
Flight Phase	cruise other
Route In Use	approach : svfr
Person 1
Affiliation	government : faa
Function	other personnel other
Qualification	other
ASRS Report	137523
Person 2
Affiliation	government : faa
Function	other personnel other
Qualification	other
Events
Anomaly	non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

The control zone was IFR. There were 2 aircraft (a helicopter and a small float plane), both with special VFR clrncs, agreeing to maintain visibility sep in the control zone. An atx X on the ground requested an IFR clearance. Before an IFR clearance is issued in the ktn control zone, the zone must either by sterilized, or the aircraft must request a revilla corridor clearance. The controller who was in charge of obtaining the clearance for atx X delivered the clearance west/O informing the other controller he had done so. This lack of coordination caused a possible systems error.

Related reports:

• Air carrier conflicted with an small aircraft after departur...
• Two aircraft in a CTAF environment conflicted during an appr...
• IFR aircraft was inadvertently released as a VFR aircraft an...
• A departure IFR aircraft conflicted with an arrival aircraft...
• Aircraft Y, departure off agc, climbed through assigned alti...
• Air carrier was issued a departure heading that conflicted w...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: ACFT DEPARTURE CONFLICTED WITH ANOTHER IFR ACFT IN THE CTL ZONE RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: THE CTL ZONE WAS IFR. THERE WERE 2 ACFT (A HELI AND A SMALL FLOAT PLANE), BOTH WITH SPECIAL VFR CLRNCS, AGREEING TO MAINTAIN VIS SEP IN THE CTL ZONE. AN ATX X ON THE GND REQUESTED AN IFR CLRNC. BEFORE AN IFR CLRNC IS ISSUED IN THE KTN CTL ZONE, THE ZONE MUST EITHER BY STERILIZED, OR THE ACFT MUST REQUEST A REVILLA CORRIDOR CLRNC. THE CTLR WHO WAS IN CHARGE OF OBTAINING THE CLRNC FOR ATX X DELIVERED THE CLRNC W/O INFORMING THE OTHER CTLR HE HAD DONE SO. THIS LACK OF COORD CAUSED A POSSIBLE SYSTEMS ERROR.

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.