Hearback readback problem causes air carrier to depart on a different heading resulting in less than standard separation with a departure off parallel runway.

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Attributes
ACN	153053
Time
Date	199008
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : initial
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : initial
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller military : 4 controller non radar : 5 controller radar : 3
ASRS Report	153053
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	non adherence : clearance non adherence : required legal separation non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

Air carrier X departure runway 24 was instructed to turn left heading 210 degrees. Air carrier Y off of runway 25 was observed to be departing simultaneously and not coordinated as such. Air carrier X read back a left turn heading 120 degrees, which I didn't catch. Still thinking air carrier X was going to fly a 210 degree heading, I instructed him to expedite climb through 3000 to maintain 13000'. My first transmission to air carrier Y was to turn left heading 180 degrees and climb to 5000', using course divergence. By the time I realized air carrier X had gone through the 210 degree heading and tried to get him back on course due IFR traffic traversing the airspace from southeast-northwest, all I could do was to get visibility sep as air carrier X reported the air carrier Y insight.

Original NASA ASRS Text

Title: HEARBACK READBACK PROBLEM CAUSES ACR TO DEPART ON A DIFFERENT HEADING RESULTING IN LESS THAN STANDARD SEPARATION WITH A DEP OFF PARALLEL RWY.

Narrative: ACR X DEP RWY 24 WAS INSTRUCTED TO TURN LEFT HDG 210 DEGS. ACR Y OFF OF RWY 25 WAS OBSERVED TO BE DEPARTING SIMULTANEOUSLY AND NOT COORDINATED AS SUCH. ACR X READ BACK A LEFT TURN HDG 120 DEGS, WHICH I DIDN'T CATCH. STILL THINKING ACR X WAS GOING TO FLY A 210 DEG HDG, I INSTRUCTED HIM TO EXPEDITE CLB THROUGH 3000 TO MAINTAIN 13000'. MY FIRST XMISSION TO ACR Y WAS TO TURN LEFT HDG 180 DEGS AND CLB TO 5000', USING COURSE DIVERGENCE. BY THE TIME I REALIZED ACR X HAD GONE THROUGH THE 210 DEG HDG AND TRIED TO GET HIM BACK ON COURSE DUE IFR TFC TRAVERSING THE AIRSPACE FROM SE-NW, ALL I COULD DO WAS TO GET VIS SEP AS ACR X RPTED THE ACR Y INSIGHT.

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.