Situation: onto TRACON frequency overlap with sba TRACON during certain WX factors. Possible less than standard separation between atx X and cpr Y. Possible system error.

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Attributes
ACN	153406
Time
Date	199008
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pom
State Reference	CA
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sba tracon : ont tower : btl
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 5
ASRS Report	153406
Person 2
Affiliation	government : faa
Function	oversight : supervisor
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
Navigational Aid	Unspecified

Narrative:

Bur approach was not taking handoffs, so atx X and cpr Y were being vectored away from sector boundary. Cpr Y did not respond when called a second and third time he responded your being blocked. Controller instructions given again. He said blocked. Our best guess is sea TRACON frequency was being skipped over to us because of WX. Supervisor indicated a control instruction was heard by another aircraft. Callback conversation with reporter revealed the following: reporter experience: 5 yrs radar, 4 yrs non-radar. Reporter stated cpr Y was in trail with atx X. Reporter did not know if he had lost standard sep because of cpr Y non response to clearance because of blocked frequency. Reporter turned cpr Y away from atx X. C/a did not activate. Analyst feels there was no loss of standard radar sep. The reporter informed the supervisor about the frequency problem and the supervisor stated during certain WX conditions sba TRACON frequencys will overlap ont TRACON frequencys. Frequency in question, 125.5. Sba TRACON frequency 125.4.

Original NASA ASRS Text

Title: SITUATION: ONTO TRACON FREQ OVERLAP WITH SBA TRACON DURING CERTAIN WX FACTORS. POSSIBLE LESS THAN STANDARD SEPARATION BETWEEN ATX X AND CPR Y. POSSIBLE SYSTEM ERROR.

Narrative: BUR APCH WAS NOT TAKING HDOFS, SO ATX X AND CPR Y WERE BEING VECTORED AWAY FROM SECTOR BOUNDARY. CPR Y DID NOT RESPOND WHEN CALLED A SECOND AND THIRD TIME HE RESPONDED YOUR BEING BLOCKED. CTLR INSTRUCTIONS GIVEN AGAIN. HE SAID BLOCKED. OUR BEST GUESS IS SEA TRACON FREQ WAS BEING SKIPPED OVER TO US BECAUSE OF WX. SUPVR INDICATED A CTL INSTRUCTION WAS HEARD BY ANOTHER ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR EXPERIENCE: 5 YRS RADAR, 4 YRS NON-RADAR. RPTR STATED CPR Y WAS IN TRAIL WITH ATX X. RPTR DID NOT KNOW IF HE HAD LOST STANDARD SEP BECAUSE OF CPR Y NON RESPONSE TO CLRNC BECAUSE OF BLOCKED FREQ. RPTR TURNED CPR Y AWAY FROM ATX X. C/A DID NOT ACTIVATE. ANALYST FEELS THERE WAS NO LOSS OF STANDARD RADAR SEP. THE RPTR INFORMED THE SUPVR ABOUT THE FREQ PROB AND THE SUPVR STATED DURING CERTAIN WX CONDITIONS SBA TRACON FREQS WILL OVERLAP ONT TRACON FREQS. FREQ IN QUESTION, 125.5. SBA TRACON FREQ 125.4.

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.