Narrative:

I just departed on an initial ATC heading. I entered IMC conditions shortly after takeoff continuing during the climb out. I noticed a heading flag on the captain's side HSI and immediately looked to the co-pilot's side HSI and observed the course headings disagreed by more than 20 degrees. I used the information from the right side HSI to return the aircraft to the correct assigned heading. With the plane back on the correct heading I looked over to the right side electrical panel and noticed the breaker for the captain's side HSI was tripped. Per the company opspecs I reset the breaker; and the HSI returned to normal operations. I was then handed off to the next controller. I informed the next controller I suffered a primary nav failure on climb-out which caused a momentary course deviation but the instrument was now working. About a minute into the flight and one mile north of the airport the captain became aware of the failure by the appearance of the heading flag on the left HSI and confirmed the failure by referencing the copilot HSI. The cause of the deviation was the failure of the captains primary navigation display immediately after take off in IMC conditions. I informed the next controller I had a nav failure that fortunately I was able to reset. Upon reaching our destination I notified the dispatcher; the head of maintenance; and the station manager that I had a primary nav failure. An entry of the failure was made in the aircraft maintenance logbook.the event was caused by an equipment failure. Equipment failures will occur often without warning; and I critical times of flight. I was able to handle the failure by training and experience. There is no way to prevent equipment failures; we can only learn how to manage failures with training.

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Original NASA ASRS Text

Title: Beech 99 Captain reported that an HSI failure during climb resulted in a course deviation.

Narrative: I just departed on an initial ATC heading. I entered IMC conditions shortly after takeoff continuing during the climb out. I noticed a heading flag on the Captain's side HSI and immediately looked to the Co-pilot's side HSI and observed the course headings disagreed by more than 20 degrees. I used the information from the right side HSI to return the aircraft to the correct assigned heading. With the plane back on the correct heading I looked over to the right side electrical panel and noticed the breaker for the Captain's side HSI was tripped. Per the Company OPSPECS I reset the breaker; and the HSI returned to normal operations. I was then handed off to the next controller. I informed the next controller I suffered a primary Nav failure on climb-out which caused a momentary course deviation but the instrument was now working. About a minute into the flight and one mile north of the airport the Captain became aware of the failure by the appearance of the heading flag on the left HSI and confirmed the failure by referencing the copilot HSI. The cause of the deviation was the failure of the Captains primary navigation display immediately after take off in IMC conditions. I informed the next controller I had a nav failure that fortunately I was able to reset. Upon reaching our destination I notified the Dispatcher; the Head of Maintenance; and the Station Manager that I had a primary nav failure. An entry of the failure was made in the Aircraft Maintenance Logbook.The event was caused by an equipment failure. Equipment failures will occur often without warning; and I critical times of flight. I was able to handle the failure by training and experience. There is no way to prevent equipment failures; we can only learn how to manage failures with training.

Data retrieved from NASA's ASRS site 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.