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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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August 2025 Edition

Honeywell AS907 (HTF7000) Engine Inspection Intervals

Most inspection tasks on the Honeywell AS907 (HTF7000) are straightforward, offering consistent turntimes and cost expectations. However, it's important to note that the Borescope inspections of turbine and compressor components can reveal issues that may extend downtime and increase costs

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August 2025 Edition

Learjet Gust Locks Prevent Unnecessary Surface Damage

Gust locks lock the control column in place, preventing random movement and possible damage of the surface from wind while an aircraft is parked. It only takes a small investment to prevent damage that could cost tens of thousands of dollars and hours to repair.

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European Operators Need to Plan Now for ADS-B Upgrades

The European Aviation Safety Agency’s (EASA’s) deadline for upgrading to Automatic Dependent Surveillance-Broadcast (ADS-B) is approaching quickly. Owner/operators who need to retrofit their aircraft have until midnight on June 6, 2020, to meet the terms of the mandate.

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TDR 94/94D Common Error Codes

Your TDR-94/94D transponder communicates what is happening on the inside of the unit through error codes presented on the display. There are Level 1 Failure codes that, if ignored, are detrimental to the unit and will cost you more in the end.

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Duncan Aviation Transforms Reliable G550

Duncan Aviation recently refurbished a 12-year-old Gulfstream G550 for a customer who appreciates the dependability of the aircraft and wanted it to remain an integral part of his fleet.

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