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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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Lead Acid Aircraft Battery Maintenance & Charging

All aircraft batteries, regardless of whether they're a ni-cad, lead acid or lithium, will require maintenance at some point and time. It is important to perform these maintenance checks at the required intervals and as instructed in the prescribed maintenance instructions.

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Washing Your Pratt & Whitney Engine

I was recently asked by a customer, “Is it possible to wash my Pratt & Whitney engine too much?” The operator considered his inquiry to be silly when, in fact, it’s a very valid question.

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ATTD Flag Showing in ADI

The problem could be with the remote vertical gyro valid missing due to the gyro not being valid, or it could be the ADI itself is not positioning to where the gyro is telling it to be.

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Universal FMS Support Coming to an End

According to Service Letter (SL) No. 2843 and 2844, Universal Avionics has announced they will cease repair, support and the navigation database updates for the UNS-1M and UNS-1Msp series Navigation Management System, effective January 1, 2013.

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Radar Unit Chamber Testing Advantages

When a radar unit is in for repair, having it tested in an environmental/altitude chamber assists in duplicating ‘no fault founds’ and finding intermittent squawks.

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