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Duncan Intelligence Newsletter

The Duncan Intelligence is a free, technical newsletter for business aircraft owners and operators. Written in-house by Duncan Aviation's technical representatives, each edition includes technical tips and advice on topics and trends in business aviation. It is a free, monthly e-mail subscription for aviation enthusiasts around the world.

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September 2025 Edition

Gyro Overhaul: We Do More Than What's Required. We Do What's Right

When overhauling a Vertical Gyro, most facilities stop at replacing the components mandated by the Component Maintenance Manual. While this meets the requirements for returning the gyro to service, Duncan Aviation goes further, prioritizing what is right over what is merely required.

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Learjet 45: 10-Year Spindle Life Limit

Lear 45 operators approaching the 10-year life limit of the spindle have two options: replace the spindle or replace the spindle assembly. Each option has its benefits and drawbacks.

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TCAS 2000 AD Likely

If you have the TCAS 2000 system or its predecessor, the Honeywell TCAS II TCZ-910, there is an AD coming.

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