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Circuit Breakers

Gemini Sparkle

Key Takeaways:

  • Aircraft electrical systems, comprising components like batteries, buses, alternators, and circuit breakers, require pilots to have a fundamental understanding for safe operation and to manage potential failures.
  • The article emphasizes critical safety protocols for electrical malfunctions, particularly warning against resetting tripped circuit breakers due to fire risk and stressing that turning off the master switch is a memory item for an electrical fire.
  • Electrical system failures pose significant risks, especially in EFIS aircraft without backup power, and pilots must be familiar with how instruments react to power loss and follow specific emergency checklists, which may include terminating the flight.
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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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