<< >> NASA ASRS Report 349623, October 1996

Approach controller running opposite direction traffic off a satellite airport, had a system error when the departing military C12 did not turn when controller saw the potential conflict and issued the turn clearance. Holding traffic prevented the controller from climbing the C12.

Attributes
ACN	349623
Time
Date	199610
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oun
State Reference	OK
Altitude	msl bound lower : 2500 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : okc
Operator	other
Make Model Name	Super King Air 200/Huron
Operating Under FAR Part	other : other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 9
ASRS Report	349623
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Frequency congestion/communication failure. Aircraft #1, a C12, departed runway 21 at oun. Aircraft #2, a PA31 on localizer runway 3 approach. Aircraft #3 holding at 4000 ft over NDB at airport, therefore C12 could not climb. C12 was told to turn, but the transmission was blocked, then repeated. PA31 was told to cancel approach clearance and turn, but transmission was not received (or ignored). As a result, the C12 went over the top of the PA31 (500 ft).

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Original NASA ASRS Text

Title: APCH CTLR RUNNING OPPOSITE DIRECTION TFC OFF A SATELLITE ARPT, HAD A SYS ERROR WHEN THE DEPARTING MIL C12 DID NOT TURN WHEN CTLR SAW THE POTENTIAL CONFLICT AND ISSUED THE TURN CLRNC. HOLDING TFC PREVENTED THE CTLR FROM CLBING THE C12.

Narrative: FREQ CONGESTION/COM FAILURE. ACFT #1, A C12, DEPARTED RWY 21 AT OUN. ACFT #2, A PA31 ON LOC RWY 3 APCH. ACFT #3 HOLDING AT 4000 FT OVER NDB AT ARPT, THEREFORE C12 COULD NOT CLB. C12 WAS TOLD TO TURN, BUT THE XMISSION WAS BLOCKED, THEN REPEATED. PA31 WAS TOLD TO CANCEL APCH CLRNC AND TURN, BUT XMISSION WAS NOT RECEIVED (OR IGNORED). AS A RESULT, THE C12 WENT OVER THE TOP OF THE PA31 (500 FT).

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.