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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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July 2025 Edition

Video: Radar Stabilization Function Failure

A little understanding on how radar stabilization works can help both the flight crew determine erroneous return information, and assist the maintenance technicians tasked with troubleshooting the system.

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Pratt & Whitney Service Bulletin Update

For the Pratt & Whitney 500 engine models, there are a number of Service Bulletins that have become hot items. These can be accomplished at access for cause but they will be addressed at either a Hot Section Inspection or overhaul, whichever occurs first.

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Learjet 60: New Brake Airworthiness Directive

The FAA has issued Airworthiness Directive AD2013-13-09 that requires three separate Service Bulletins to be accomplished within 12 months or 600 hours from August 6, 2013 on the Learjet 60 Brake System.

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Learjet 60 CAB ALT HI Red Annunciator

At Duncan Aviation, we have recently been made aware of a Master Warning Light issue on Learjet 60s that have complied with Service Bulletin 60-31-2 and have the ice detector option installed with the ice detector annunciators in the Glareshield.

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Main Entrance Door Web Cracks

Over the course of several Falcon C inspections, Duncan Aviation technicians have noticed cracks emanating from the bearing carrier structure on the forward and aft bell-crank assembly web.

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