Beechcraft King Air 350 — Service Bulletins

This service bulletin, SB 34-4171, provides instructions and parts for upgrading the Pro Line Fusion software on various Beechcraft King Air models, specifically from Phase 1 and Phase 2 to Phase 3. It is applicable to models including the Super King Air B200GT, B200CGT, B300, B300C, and King Air C90GTI. The bulletin outlines compliance requirements, necessary modifications, and the specific serial numbers of affected aircraft. It emphasizes that only Textron Aviation-authorized service centers can perform the modifications and that the upgrade is recommended during scheduled maintenance. The document includes detailed accomplishment instructions, consumable materials needed, and references to affected publications.

• This service bulletin is for upgrading Pro Line Fusion software to Phase 3 on specific King Air models.
• Only Textron Aviation-authorized service centers can perform the modifications outlined in this bulletin.
• Compliance is recommended during scheduled maintenance periods.
• The bulletin includes detailed steps for electrical wiring modifications and IOC card upgrades.
• Operators must ensure the ASPU is at MOD 3A before starting the upgrade.