Narrative:

While in cruise enroute to ZZZ; the captain side attitude direction indicator (ADI) went blank. After a minute or so; I heard a crackling type sound and noticed a very strong electrical odor. A mechanic was on board and noticed that the ADI breaker had popped; so logically we left it out and I transferred control to the first officer; and I became pilot monitoring.when we noticed the odor; we re-checked our oxygen masks and I briefed the first officer (first officer) that if we see smoke of any kind; we were to don the mask and goggles; establish communications; and proceed to the nearest suitable airport. Since we knew the likely source of the odor and it had dissipated; I elected to continue the flight without declaring an emergency. I kept the cockpit bright to detect any smoke until below 10;000 feet MSL on the way in to ZZZ.furthermore; I opened the QRH to the smoke; fire and fumes checklist and briefed it just in case the problem returned. Also; the first officer and I agreed upon the nearest suitable airport as we progressed along the route in the event of a smoke/fire emergency so no time would be wasted getting on the ground. Again; with the breaker popped and no more odor; I deemed it safe to continue with robust contingency planning along the route.as we descended into ZZZ; the captain side HSI began to flicker on and off. Not knowing if this was a related issue; I immediately instructed the mechanic to find and pull the breaker. He did so; and we landed without incident in ZZZ without my primary displays.during flight after the ADI breaker popped; the mechanic decided to closely scrutinize the aircraft maintenance log. He found that days earlier; the captain's 'nd' (technically HSI on the 767) had been written up by the crew because it was flickering. The corrective action was to replace the ADI - the incorrect display; which was ultimately the one that failed on our flight.

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Original NASA ASRS Text

Title: B767 Captain reported electrical odor and multiple navigation equipment failures.

Narrative: While in cruise enroute to ZZZ; the Captain side Attitude Direction Indicator (ADI) went blank. After a minute or so; I heard a crackling type sound and noticed a very strong electrical odor. A mechanic was on board and noticed that the ADI breaker had popped; so logically we left it out and I transferred control to the First Officer; and I became pilot monitoring.When we noticed the odor; we re-checked our oxygen masks and I briefed the FO (First Officer) that if we see smoke of any kind; we were to don the mask and goggles; establish communications; and proceed to the nearest suitable airport. Since we knew the likely source of the odor and it had dissipated; I elected to continue the flight without declaring an emergency. I kept the cockpit bright to detect any smoke until below 10;000 feet MSL on the way in to ZZZ.Furthermore; I opened the QRH to the smoke; fire and fumes checklist and briefed it just in case the problem returned. Also; the FO and I agreed upon the nearest suitable airport as we progressed along the route in the event of a smoke/fire emergency so no time would be wasted getting on the ground. Again; with the breaker popped and no more odor; I deemed it safe to continue with robust contingency planning along the route.As we descended into ZZZ; the Captain side HSI began to flicker on and off. Not knowing if this was a related issue; I immediately instructed the mechanic to find and pull the breaker. He did so; and we landed without incident in ZZZ without my primary displays.During flight after the ADI breaker popped; the mechanic decided to closely scrutinize the aircraft maintenance log. He found that days earlier; the Captain's 'ND' (technically HSI on the 767) had been written up by the crew because it was flickering. The corrective action was to replace the ADI - the incorrect display; which was ultimately the one that failed on our flight.

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.