<< >> NASA ASRS Report 527010, September 2001

Lax local controller cancels takeoff clearance of aircraft in position when B747 assumes broken transmission approves their runway crossing.

Attributes
ACN	527010
Time
Date	200109
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	527010
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : separated traffic controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Airport Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared to land lax 25L with normal tower communications. After clearing runway 25L, holding short of runway 25R on tango, I noticed tower frequency unusually quiet with no observed traffic. I reported on 120.95 (tower frequency) holding short and no response was received. I then heard our callsign 'air carrier X' called three times but tower apparently could not hear our reply. A broken transmission was received 'air carrier X...cleared cross...' I read back the crossing clearance and visually checked for traffic with none observed. Normal communication was restored while crossing. Tower canceled takeoff clearance for another aircraft and ask air carrier X to call on landline.

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Original NASA ASRS Text

Title: LAX LCL CTLR CANCELS TKOF CLRNC OF ACFT IN POSITION WHEN B747 ASSUMES BROKEN TRANSMISSION APPROVES THEIR RWY XING.

Narrative: WE WERE CLRED TO LAND LAX 25L WITH NORMAL TWR COMS. AFTER CLEARING RWY 25L, HOLDING SHORT OF RWY 25R ON TANGO, I NOTICED TWR FREQ UNUSUALLY QUIET WITH NO OBSERVED TFC. I RPTED ON 120.95 (TWR FREQ) HOLDING SHORT AND NO RESPONSE WAS RECEIVED. I THEN HEARD OUR CALLSIGN 'ACR X' CALLED THREE TIMES BUT TWR APPARENTLY COULD NOT HEAR OUR REPLY. A BROKEN XMISSION WAS RECEIVED 'ACR X...CLRED CROSS...' I READ BACK THE XING CLRNC AND VISUALLY CHECKED FOR TFC WITH NONE OBSERVED. NORMAL COM WAS RESTORED WHILE XING. TWR CANCELED TKOF CLRNC FOR ANOTHER ACFT AND ASK ACR X TO CALL ON LANDLINE.

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.