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I.L.A.F.F.T.: The Glide Slope

A faulty glideslope connection fools a pilot into following the instrument's needle almost into the ground.

Credit: Joel Kimmel
Gemini Sparkle

Key Takeaways:

  • A pilot experienced a near-fatal incident during an ILS approach when a disconnected wire caused the glideslope indicator to falsely appear centered, leading to a dangerously low descent.
  • The instrument malfunction provided a continuous "on-course" glideslope indication, misleading the pilot until they narrowly avoided hitting trees short of the runway.
  • The incident highlights the critical importance of understanding subtle instrument behaviors, recognizing the absence of valid signal "flags," and questioning seemingly "too perfect" navigational indications, especially during critical phases of flight.
See a mistake? Contact us.

It was 2001, and an IFR-approved panel-mounted GPS had just been installed in my airplane, a Cessna 180. I was anxious to see it in action with its moving map, multitude of functions, and the information it provided. A short 20-minute flight to a nearby airport for breakfast with a friend and some hands-on use of the new equipment was in order.

The weather at the breakfast airport that morning was not VFR because there was a low marine stratus layer. The AWOS reported instrument conditions, with a 300-foot overcast but reasonable visibility of 4 miles below the cloud deck. Because I pride myself by staying instrument current, this would help me stay current.

Alen Hewitt

Alen Hewitt flew U-8s in Vietnam and is a retired electrical engineer who owns a 1966 Cessna 180.

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