Service Instruction

SI 1589

Lycoming Engines

Issued: 2023-12-01
Revision: -
Document type: SI
Models covered: 0

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SI 1589

Lycoming Engines

Issued 2023-12-01

Manufacturer - not an FAA rule

NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.

Exhaust Bypass Valve Assembly Replacement

Source: Lycoming Engines, retrieved 2026-09-01

View on Lycoming Engines' site

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