While flying into clouds you may smell an odor of electrical fire; what is a possible cause?

• A. Electrical fire or volcanic ash
• B. Engine oil leak
• C. Fresh rain
• D. Burnt insulation

Answer: (A)

An odor of electrical fire in flight points to a potential electrical problem. If you’re flying through clouds and encounter this odor, a plausible cause is an electrical fire, or environmental contamination such as volcanic ash in the air that can cause electrical arcing and overheating in aircraft systems. In that context, both explanations are the most consistent with the signal you’re getting.

Other odors like burnt oil, fresh rain, or burnt insulation don’t fit the cue as well. An engine oil leak would more likely produce a petroleum smell; fresh rain isn’t associated with electrical issues; and burnt insulation could cause a burning odor too, but the specific cue of an electrical-fire-type smell in clouds aligns best with electrical fire or volcanic ash.