Cessna CIL-21-03: Water Separator Corrosion Repair

December 2017

Duncan Aviation’s Battle Creek, MI, location has secured the necessary tooling to complete the Cessna CIL-21-03, in its entirety.

The CIL, released in October of 2015, addresses corrosion of the water separator and its associated parts aboard the Cessna 560XL and 680 aircraft. The repair consists of a cleaning process, and evaluation for the depth of pits, and a coating application to protect the area.

Up until now, the units had to be sent to the OEM to perform a pressure test of the assembly for durability before it is returned to service. Because of this, many Citation operators were forced to replace at a high cost rather than repair.

We now have the proper tooling to provide Cessna operators a more cost-effective option with a reasonable turntime.

If you have any questions about CIL-21-03 or other technical questions about your Citation aircraft, don’t hesitate to contact me.


Inside of water separator housing full of corrosion. 



Chuck Zahnow Airframe Tech Rep Citation, Hawker Battle Creek, MI (BTL) +1 269.969.8422

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