Service Bulletin No. 663
Non-Conforming Counterweight Bushings
Publications
Service Bulletin No. 663
July, 2025
MODELS AFFECTED:
GO-435 Series
GO, GSO, IGO, IGSO-480 Series (Except GO-480-B1A6 with the following
Engine S/N’s: L-567-28, L-569-28, L-573-28, L-574-28, L-575-28, L-576-28)
VO, IGO, IGSO-540 Series
TIO, TIGO-541 Series
TIME OF COMPLIANCE:
Before further flight
