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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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Learjet 31A AHRS Document Errors

Recently, I have experienced an increase in the number of inquiries about the Attitude Heading Reference System (AHRS) in the Learjet 31A. Between Service Bulletin (SB) 31-34-9, the Illustrated Parts Catalog (IPC) 34-24-11 and the Aircraft Maintenance Manual (AMM) 34-28-00, there are numerous errors.

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Hawker Pitot System Leaks

Recently, a Hawker 800XP being tested for the Stall Detector Functional test at Duncan Aviation exhibited an open #2 pitot system.

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Learjet Tire Changes

It sounds pretty simple, but there is a lot of confusing and conflicting information on Learjet tire changes you should be aware of.

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