Mandatory Service Bulletin Issued for Superior Millennium Cylinders

Three engine models are included in the required intake valve replacement.

Meg Godlewski

Tuesday, December 13, 2022 at 10:29 AM ET

Verified

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Key Takeaways:

Superior Air Parts has issued a mandatory service bulletin (MSB) requiring the replacement of specific intake valves (P/N SA539988) due to potential in-service failure.
These affected valves were shipped between February 23, 2020, and January 20, 2022, and are used in new Superior Millennium Cylinders or cylinders rebuilt/overhauled with Superior intake valves for Continental 470-, 520-, and 550-series engines.
Aircraft found with the faulty valves must be immediately grounded until replaced, and owners of aircraft with rebuilt/overhauled cylinders should contact their maintenance shops to confirm if affected parts were used.

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Superior Air Parts, Inc., has issued a mandatory service bulletin (MSB) requiring the replacement of intake valves used in new Superior Millennium Cylinders and cylinders rebuilt/overhauled with Superior intake valves found on Continental 470-, 520- and 550-series engines.

According to a statement from Superior Air Parts, the MSB covers intake valves with part number SA539988. These intake valves were shipped between February 23, 2020 and January 20, 2022.