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Heading To Nowhere

Gemini Sparkle

Key Takeaways:

  • A pilot encountered significant difficulties performing instrument approaches in IMC due to a severely precessing directional gyro (DG).
  • The faulty DG led to multiple missed localizer intercepts, spatial disorientation, and a dangerous aircraft attitude excursion during the approach attempts.
  • The experience underscored the unreliability of traditional "steam gauge" instruments, even recently overhauled ones, prompting the pilot to plan an upgrade to an all-glass cockpit.
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It already had been a long day, flogging my Piper Arrow across what felt like half the U.S. I was aiming for a sizable regional airport to spend some vacation time with an old friend, which was turning into a two-leg, seven-hour slog into headwinds. The weather mostly had been clear, but an undercast crept in below me for the last 200 or so miles. As a result, my destination was advertising 800 feet overcast with good visibility underneath and little wind. It had plenty of approaches, and I had been here before.

Although I received what I considered a late descent clearance, I didn’t anticipate any problems. The airplane was fine and I was instrument-current. The only potential squawk I had was a directional gyro that needed resetting every 15 minutes or so, thanks to precession. The rest of my panel’s steam-gauge instruments and the vacuum system itself were nominal.

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