Narrative:

On a visual approach to runway 25L at lax and using the ILS runway 25L approach as a back-up approach in VMC; we were configured to land inside the OM. Lax tower had given us a landing clearance and advised us of a B757 on landing rollout and that a brasilia aircraft would be taking the runway for departure; prior to our arrival. As we approached short final; both aircraft were acquired visually. After the brasilia taxied into position on runway 25L ahead of us; the tower radio frequency became interfered with by what sounded like a stuck microphone on the frequency (120.95). The xmissions on the frequency that followed were garbled and unreadable. It sounded as though the tower was attempting to clear the brasilia on the runway ahead of us for takeoff. The brasilia was not responding and remained on the runway in position; continuing to block the touchdown zone. At approximately 700 ft AGL we executed a go around climbing straight ahead. As the go around maneuver was accomplished; the brasilia aircraft on the runway commenced a takeoff roll. We offset slightly to the south to avoid flying over the brasilia's takeoff leg. At this time we heard our first transmission over guard frequency (121.5) assigning us a go around heading and departure frequency. We contacted los angeles departure control and complied with the assigned climb out procedure. Los angeles departure control provided us with radar vectors for a return approach and landing on runway 25L. As far as we know; no separation criteria was violated. Supplemental information from acn 748016: after we landed; tower advised us that the aircraft in position had a stuck microphone. It was very difficult to see the brasilia in position at night. Had the controller not told us about the aircraft 'in position' when we received our landing clearance; I am not sure I would have seen the plane and taken our go around.

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Original NASA ASRS Text

Title: B737 LNDG LAX 25L. STUCK MIKE ON FREQ BLOCKED COM. OBSERVED RWY DEP TFC NOT MOVING; AND INITIATED GAR TURNING SOUTH NOT TO OVERFLY TFC.

Narrative: ON A VISUAL APCH TO RWY 25L AT LAX AND USING THE ILS RWY 25L APCH AS A BACK-UP APCH IN VMC; WE WERE CONFIGURED TO LAND INSIDE THE OM. LAX TWR HAD GIVEN US A LNDG CLRNC AND ADVISED US OF A B757 ON LNDG ROLLOUT AND THAT A BRASILIA ACFT WOULD BE TAKING THE RWY FOR DEP; PRIOR TO OUR ARR. AS WE APCHED SHORT FINAL; BOTH ACFT WERE ACQUIRED VISUALLY. AFTER THE BRASILIA TAXIED INTO POS ON RWY 25L AHEAD OF US; THE TWR RADIO FREQ BECAME INTERFERED WITH BY WHAT SOUNDED LIKE A STUCK MIKE ON THE FREQ (120.95). THE XMISSIONS ON THE FREQ THAT FOLLOWED WERE GARBLED AND UNREADABLE. IT SOUNDED AS THOUGH THE TWR WAS ATTEMPTING TO CLR THE BRASILIA ON THE RWY AHEAD OF US FOR TKOF. THE BRASILIA WAS NOT RESPONDING AND REMAINED ON THE RWY IN POS; CONTINUING TO BLOCK THE TOUCHDOWN ZONE. AT APPROX 700 FT AGL WE EXECUTED A GAR CLBING STRAIGHT AHEAD. AS THE GAR MANEUVER WAS ACCOMPLISHED; THE BRASILIA ACFT ON THE RWY COMMENCED A TKOF ROLL. WE OFFSET SLIGHTLY TO THE S TO AVOID FLYING OVER THE BRASILIA'S TKOF LEG. AT THIS TIME WE HEARD OUR FIRST XMISSION OVER GUARD FREQ (121.5) ASSIGNING US A GAR HDG AND DEP FREQ. WE CONTACTED LOS ANGELES DEP CTL AND COMPLIED WITH THE ASSIGNED CLBOUT PROC. LOS ANGELES DEP CTL PROVIDED US WITH RADAR VECTORS FOR A RETURN APCH AND LNDG ON RWY 25L. AS FAR AS WE KNOW; NO SEPARATION CRITERIA WAS VIOLATED. SUPPLEMENTAL INFO FROM ACN 748016: AFTER WE LANDED; TWR ADVISED US THAT THE ACFT IN POS HAD A STUCK MIKE. IT WAS VERY DIFFICULT TO SEE THE BRASILIA IN POS AT NIGHT. HAD THE CTLR NOT TOLD US ABOUT THE ACFT 'IN POS' WHEN WE RECEIVED OUR LNDG CLRNC; I AM NOT SURE I WOULD HAVE SEEN THE PLANE AND TAKEN OUR GAR.

Data retrieved from NASA's ASRS site as of January 2009 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.