<< >> NASA ASRS Report 341277, July 1996

PA38 an IFR departure off pwa had less than standard separation with an MO21 that was on a missed approach at pwa. Okc reporter indicated he had planned on the pwa local controller to provide the IFR separation between the 2 aircraft. Late data tag acquiring on TRACON radar contributed to the error.

Attributes
ACN	341277
Time
Date	199607
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pwa
State Reference	OK
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : okc tower : pwa
Operator	general aviation : personal
Make Model Name	PA-38 Tomahawk
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	M-20 E Super 21
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 9
ASRS Report	341277
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 2500 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

The PA38 departed pwa heading 200 degrees climbing to 3000 ft on initial contact the PA38 was turned to heading 340 degrees. The MO21 was on an ILS runway 17L practice approach with a planned missed approach of 260 degree climbing to 3000 ft. We planned on pwa tower providing IFR separation between successive departures. At the time of the missed approach by the MO21, there was just over 3 NM separation, but decreasing rapidly. The MO21's data tag did not acquire until the aircraft was 2 NM west of pwa. At this time, the PA38 was 3 NM west of pwa and the aircraft were on converging course. Action was taken at once to establish diverging courses. The initial transmission of both aircraft were blocked by interfacility coordination.

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Original NASA ASRS Text

Title: PA38 AN IFR DEP OFF PWA HAD LTSS WITH AN MO21 THAT WAS ON A MISSED APCH AT PWA. OKC RPTR INDICATED HE HAD PLANNED ON THE PWA LCL CTLR TO PROVIDE THE IFR SEPARATION BTWN THE 2 ACFT. LATE DATA TAG ACQUIRING ON TRACON RADAR CONTRIBUTED TO THE ERROR.

Narrative: THE PA38 DEPARTED PWA HDG 200 DEGS CLBING TO 3000 FT ON INITIAL CONTACT THE PA38 WAS TURNED TO HDG 340 DEGS. THE MO21 WAS ON AN ILS RWY 17L PRACTICE APCH WITH A PLANNED MISSED APCH OF 260 DEG CLBING TO 3000 FT. WE PLANNED ON PWA TWR PROVIDING IFR SEPARATION BTWN SUCCESSIVE DEPS. AT THE TIME OF THE MISSED APCH BY THE MO21, THERE WAS JUST OVER 3 NM SEPARATION, BUT DECREASING RAPIDLY. THE MO21'S DATA TAG DID NOT ACQUIRE UNTIL THE ACFT WAS 2 NM W OF PWA. AT THIS TIME, THE PA38 WAS 3 NM W OF PWA AND THE ACFT WERE ON CONVERGING COURSE. ACTION WAS TAKEN AT ONCE TO ESTABLISH DIVERGING COURSES. THE INITIAL XMISSION OF BOTH ACFT WERE BLOCKED BY INTERFACILITY COORD.

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.