Dwf controller described a wrong turn event when a foreign aircraft was instructed to 'RNAV to larrn...

Narrative:

Aircraft X was cleared for takeoff runway 18R with instructions; RNAV to larrn. Aircraft X read back; 'runway 18R cleared for takeoff.' I watched him for about 3.5 - 4 miles and he appeared to be on the correct departure course. I was told a few minutes later; at around 4 miles; he turned left. My supervisor asked me what I told him. While I did tell him to RNAV to larrn; the pilot did not read that portion back. I was told a pilot deviation would be filed and I should have had the pilot read back RNAV to larrn. When given the briefing on RNAV and telling the pilots the first fix; I specifically asked if the pilots had to read it back. I was told no; we only had to correct incorrect read backs. Recommendation: either have us get the read back or don't. I believe whether the pilot read it back or not; he still would have flown the SID incorrectly. Maybe we [should] just give all foreign call signs a heading since this seems to be a recurring issue.

Original NASA ASRS Text

Title: DWF Controller described a wrong turn event when a foreign aircraft was instructed to 'RNAV to LARRN;' but failed to initiate the turn. The reporter was also questioned with regard to a specific clearance read back.

Narrative: Aircraft X was cleared for takeoff Runway 18R with instructions; RNAV to LARRN. Aircraft X read back; 'Runway 18R cleared for takeoff.' I watched him for about 3.5 - 4 miles and he appeared to be on the correct departure course. I was told a few minutes later; at around 4 miles; he turned left. My Supervisor asked me what I told him. While I did tell him to RNAV to LARRN; the pilot did not read that portion back. I was told a pilot deviation would be filed and I should have had the pilot read back RNAV to LARRN. When given the briefing on RNAV and telling the pilots the first fix; I specifically asked if the pilots had to read it back. I was told no; we only had to correct incorrect read backs. Recommendation: either have us get the read back or don't. I believe whether the pilot read it back or not; he still would have flown the SID incorrectly. Maybe we [should] just give all foreign call signs a heading since this seems to be a recurring issue.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	958681
Time
Date	201107
Local Time Of Day	1801-2400
Place
Locale Reference	DFW.Airport
State Reference	TX
Environment
Light	Night
Aircraft 1
Make Model Name	BAe 125 Series 800
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

Dwf controller described a wrong turn event when a foreign aircraft was instructed to 'RNAV to larrn;' but failed to initiate the turn. The reporter was also questioned with regard to a specific clearance read back.