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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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TFE731: New Oil Tank Instruction Plate

Honeywell has issued two Category II Reliability Service Bulletins (SB) TFE731-79-3070 R1 and TFE731-79-5120 for the installation of new instruction plate decals on oil tanks to help prevent oil over-servicing.

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Wi-Fi Connection Interference

When the on-board microwave is in use, several operators have reported to Duncan Aviation avionics techs an intermittent interruption in Wi-Fi service while using laptops or personal electronic devices (PED), such as BlackBerrys or iPhones.

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Astra Cabin Door Binding in Cold Weather

I just helped out an operator with a cabin door binding issue who was in a very cold part of the country where the aircraft sat for five days in the freezing rain, sleet and snow.

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