The brake fluid reservoir on a King Air is situated in the upper left-hand nose avionics bay. Over-servicing of the reservoir can lead to issues with nearby avionic units.
Identifying the reservoir's location is easy when the avionics bay door is removed, as there is a distinctive red stain on the dust cover caused by hydraulic fluid. While this stain is generally harmless, the actual problem typically resides within the avionics equipment positioned just ahead of the reservoir. Depending on the King Air model, this space may house the Flight Director Computer, Autopilot Computer, Air Data Computer, or other avionics units.
Overfilling the brake fluid reservoir and having a worn seal on the screw-top lid can result in a troublesome and costly situation for the delicate electronic equipment nearby. The leaked fluid has the potential to impact these units adversely. This is a prevalent issue and can easily occur, so it's crucial to adhere to Chapter 12 guidelines, which recommend filling the reservoir to within one inch of the top. Caution should be exercised to avoid overfilling.
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