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Circuit Breakers

Gemini Sparkle

Key Takeaways:

  • Aircraft electrical systems, consisting of components like batteries, buses, and alternators/generators, are protected by circuit breakers and fuses to prevent dangerous overloads or short circuits that can lead to fire.
  • Pilots must understand how electrical failures impact instrumentation (especially EFIS vs. traditional), communication, and essential systems, and be prepared to follow emergency procedures.
  • Key safety practices include avoiding resetting tripped circuit breakers, powering down avionics during engine start, and conducting preflight checks of standby electrical systems in EFIS aircraft.
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The flight test was not going well. I was doing fine, which was easy because I was the check airman giving it. The guy I was testing, though, was having more trouble than expected. A few maneuvers were marginal, but so far none called for a failure. So far.

Next was an ILS approach. We were in instrument conditions, and I was paying close attention. As we approached glide slope intercept, I started doing less fine. He had not reduced power, so we were at cruise airspeed, about 30 knots too fast for putting the landing gear down. A check airman is not supposed to instruct, so I had to stay silent. But I didn’t want to leave landing gear parts strewn along the final approach course, either. so I pulled the landing gear circuit breaker. If he tried something funny the gear would not come down.

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