Narrative:

On departure; assigned heading 015 degrees. First officer started turn and realized that his HSI failed. We corrected back to a 015 degree heading but initially overshot to 035 degree heading. Departure pointed out that our assigned heading was 015 degrees. I told him that we overshot and asked if that had created a problem. He handed us off to the next frequency without responding to the question. During climb out; I selected 'both on 1' to provide heading information on the first officer's HSI. We requested vectors back to ZZZ. No emergency was declared. We accomplished an uneventful landing. Maintenance replaced the air data computer for the first officer; dispatch was notified; and we proceeded to our destination. I could have physically stopped the turn instead of verbally identing the problem.

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Original NASA ASRS Text

Title: B737 CAPT REPORTS FO HSI FAILURE ON DEPARTURE CAUSING HEADING OVERSHOOT. CAPT ELECTS TO RETURN FOR REPAIRS.

Narrative: ON DEP; ASSIGNED HDG 015 DEGS. FO STARTED TURN AND REALIZED THAT HIS HSI FAILED. WE CORRECTED BACK TO A 015 DEG HDG BUT INITIALLY OVERSHOT TO 035 DEG HDG. DEP POINTED OUT THAT OUR ASSIGNED HDG WAS 015 DEGS. I TOLD HIM THAT WE OVERSHOT AND ASKED IF THAT HAD CREATED A PROB. HE HANDED US OFF TO THE NEXT FREQ WITHOUT RESPONDING TO THE QUESTION. DURING CLBOUT; I SELECTED 'BOTH ON 1' TO PROVIDE HDG INFO ON THE FO'S HSI. WE REQUESTED VECTORS BACK TO ZZZ. NO EMER WAS DECLARED. WE ACCOMPLISHED AN UNEVENTFUL LNDG. MAINT REPLACED THE ADC FOR THE FO; DISPATCH WAS NOTIFIED; AND WE PROCEEDED TO OUR DEST. I COULD HAVE PHYSICALLY STOPPED THE TURN INSTEAD OF VERBALLY IDENTING THE PROB.

Data retrieved from NASA's ASRS site as of May 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.