Air carrier X received interference on oak ATIS frequency 128 pt 5.

Attributes
ACN	307396
Time
Date	199506
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pxn
State Reference	CA
Altitude	msl bound lower : 20000 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa tower : oak tower : bqn
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 10000 flight time type : 5500
ASRS Report	307396
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

Oakland (oak) ATIS frequency (128.5) is continually interfered with by an oakland local approach control frequency that I could not positively identify. Happens primarily when approaching oak from south and above 10000 ft. Could result in obtaining incorrect ATIS information and usually causes delays in obtaining ATIS altimeter settings until close to oak. Callback conversation with reporter revealed the following information: oak tower supervisor stated they have had no reports of interference with ATIS frequency 128.5.

Original NASA ASRS Text

Title: ACR X RECEIVED INTERFERENCE ON OAK ATIS FREQ 128 PT 5.

Narrative: OAKLAND (OAK) ATIS FREQ (128.5) IS CONTINUALLY INTERFERED WITH BY AN OAKLAND LCL APCH CTL FREQ THAT I COULD NOT POSITIVELY IDENT. HAPPENS PRIMARILY WHEN APCHING OAK FROM S AND ABOVE 10000 FT. COULD RESULT IN OBTAINING INCORRECT ATIS INFO AND USUALLY CAUSES DELAYS IN OBTAINING ATIS ALTIMETER SETTINGS UNTIL CLOSE TO OAK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: OAK TWR SUPVR STATED THEY HAVE HAD NO RPTS OF INTERFERENCE WITH ATIS FREQ 128.5.

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.