A pilot over san francisco reported a commercial radio broadcast loud enough to block nct and sfo to...

Attributes
ACN	1248842
Time
Date	201503
Local Time Of Day	1201-1800
Place
Locale Reference	SFO.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Communication Systems
Person 1
Function	Instructor
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 2500 Flight Crew Type 800
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Inflight Event / Encounter Other / Unknown

Narrative:

Contacted norcal and was cleared into class B at/below 2000 ft.; proposed route of flight was from the golden gate bridge via highway 101 over sfo then south for landing.experienced radio interference over downtown san francisco at 1500 ft. Sounded like a local radio station breaking through onto both aircraft comm's with high volume static hash. Was instructed by norcal to change frequencies to sfo tower.contacted sfo tower; they replied with our full callsign but was unable to understand all of their call. We could hear them continuing to call us; but were unable to copy all of transmission. As we were turning around to head north (away from sfo) and away from class B we entered 1NM into class B at 1500 ft.then contacted norcal and explained that due to radio issues we would not continue into class B and opted for an alternative route to destination.I experienced this radio interference a few weeks prior in another airplane in the same location. It prevented us from flying our desired flight route and from maintaining desired communications with ATC. Other pilots have subsequently remarked that they have experienced the same radio interference in this location; particularly at low altitude; but have said that often norcal's signal is strong enough to break through the hash.

Original NASA ASRS Text

Title: A pilot over San Francisco reported a commercial radio broadcast loud enough to block NCT and SFO Tower necessitating the flight's exit from Class B airspace.

Narrative: Contacted NORCAL and was cleared into Class B at/below 2000 ft.; proposed route of flight was from the Golden Gate Bridge via HWY 101 over SFO then south for landing.Experienced radio interference over downtown San Francisco at 1500 ft. Sounded like a local radio station breaking through onto both aircraft COMM's with high volume static hash. Was instructed by NORCAL to change frequencies to SFO tower.Contacted SFO tower; they replied with our full callsign but was unable to understand all of their call. We could hear them continuing to call us; but were unable to copy all of transmission. As we were turning around to head North (away from SFO) and away from Class B we entered 1NM into Class B at 1500 ft.Then contacted NORCAL and explained that due to radio issues we would not continue into Class B and opted for an alternative route to destination.I experienced this radio interference a few weeks prior in another airplane in the same location. It prevented us from flying our desired flight route and from maintaining desired communications with ATC. Other pilots have subsequently remarked that they have experienced the same radio interference in this location; particularly at low altitude; but have said that often NORCAL's signal is strong enough to break through the hash.

Data retrieved from NASA's ASRS site 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.

A pilot over san francisco reported a commercial radio broadcast loud enough to block nct and sfo tower necessitating the flight's exit from class B airspace.