Flight crew of a 2 engine widebody transport responded to clearance intended for another aircraft resulting in turning off prescribed SID track for direct routing and increasing speed.

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Attributes
ACN	449418
Time
Date	199909
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax.airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : holtz.holtz
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 250 flight time total : 12000 flight time type : 2000
ASRS Report	449418
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 1000
ASRS Report	449240
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued alert controller : issued new clearance none taken : detected after the fact
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Between pevee and holtz, first officer read back a clearance to proceed direct to thermal and increase speed to 310 KTS. We turned toward thermal and just as our airspeed reached 310 KTS, the controller asked us if we were headed to holtz. We told him that he had cleared us to thermal. He said that he had cleared another flight direct thermal, not us. We were then given a heading followed shortly by clearance direct to thermal. We never did hear another aircraft on that frequency.

Original NASA ASRS Text

Title: FLC OF A 2 ENG WDB RESPONDED TO CLRNC INTENDED FOR ANOTHER ACFT RESULTING IN TURNING OFF PRESCRIBED SID TRACK FOR DIRECT ROUTING AND INCREASING SPD.

Narrative: BTWN PEVEE AND HOLTZ, FO READ BACK A CLRNC TO PROCEED DIRECT TO THERMAL AND INCREASE SPD TO 310 KTS. WE TURNED TOWARD THERMAL AND JUST AS OUR AIRSPD REACHED 310 KTS, THE CTLR ASKED US IF WE WERE HEADED TO HOLTZ. WE TOLD HIM THAT HE HAD CLRED US TO THERMAL. HE SAID THAT HE HAD CLRED ANOTHER FLT DIRECT THERMAL, NOT US. WE WERE THEN GIVEN A HDG FOLLOWED SHORTLY BY CLRNC DIRECT TO THERMAL. WE NEVER DID HEAR ANOTHER ACFT ON THAT FREQ.

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.