B737-300 crew, inside the FAF at sfo, lost VHF communications with tower due to a stuck microphone o...

Attributes
ACN	533994
Time
Date	200112
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	agl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sfo.tower tower : sba.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	Airbus Industrie Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 800
ASRS Report	533994
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft ATC Facility
Primary Problem	Ambiguous

Narrative:

On a visual approach to runway 19R at sfo, we were switched by ATC to sfo tower at about the FAF (we had been searching for airbus traffic going to the parallel runway). With tower we were cleared to land on runway 19R. Shortly thereafter, someone got a hot microphone on the tower frequency, all xmissions came over with a loud squeal. There was an aircraft holding between runways 19L&right. The captain ordered me to try and tune up another frequency on the second radio (I believe it was a back-up tower frequency). While I was 'heads down' messing with the radio, the captain said something to the effect that the other aircraft was crossing our runway. We did not hear it get cleared to cross due to the hot microphone problem. The captain asked if I thought we should go around and I said 'yes, let's go ahead and go around.' however, the crossing aircraft cleared our runway in plenty of time and the captain elected to continue the landing. Since there was no threat to safety, I did not call for another go around or take the controls since that may have led to confusion. There was no loss of separation.

Original NASA ASRS Text

Title: B737-300 CREW, INSIDE THE FAF AT SFO, LOST VHF COMS WITH TWR DUE TO A STUCK MIKE ON FREQ.

Narrative: ON A VISUAL APCH TO RWY 19R AT SFO, WE WERE SWITCHED BY ATC TO SFO TWR AT ABOUT THE FAF (WE HAD BEEN SEARCHING FOR AIRBUS TFC GOING TO THE PARALLEL RWY). WITH TWR WE WERE CLRED TO LAND ON RWY 19R. SHORTLY THEREAFTER, SOMEONE GOT A HOT MIKE ON THE TWR FREQ, ALL XMISSIONS CAME OVER WITH A LOUD SQUEAL. THERE WAS AN ACFT HOLDING BTWN RWYS 19L&R. THE CAPT ORDERED ME TO TRY AND TUNE UP ANOTHER FREQ ON THE SECOND RADIO (I BELIEVE IT WAS A BACK-UP TWR FREQ). WHILE I WAS 'HEADS DOWN' MESSING WITH THE RADIO, THE CAPT SAID SOMETHING TO THE EFFECT THAT THE OTHER ACFT WAS XING OUR RWY. WE DID NOT HEAR IT GET CLRED TO CROSS DUE TO THE HOT MIKE PROB. THE CAPT ASKED IF I THOUGHT WE SHOULD GO AROUND AND I SAID 'YES, LET'S GO AHEAD AND GO AROUND.' HOWEVER, THE XING ACFT CLRED OUR RWY IN PLENTY OF TIME AND THE CAPT ELECTED TO CONTINUE THE LNDG. SINCE THERE WAS NO THREAT TO SAFETY, I DID NOT CALL FOR ANOTHER GAR OR TAKE THE CTLS SINCE THAT MAY HAVE LED TO CONFUSION. THERE WAS NO LOSS OF SEPARATION.

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.

B737-300 crew, inside the FAF at sfo, lost VHF communications with tower due to a stuck microphone on frequency.