DATE: April 10, 1987 MODELS AFFECTED: GO-435, GO-480, IGO-480. GSO-480, IGSO-480. IGO-540, IGSO-540, VO-540. TIGO-541. TIME OF COMPLIANCE: At all times during engine operation including ground running.
REPRINT OF HARTZELL ENGINE TECHNOLOGIES' SERVICE BULLETIN ASB 069 DATE: August 29, 2017 MODELS AFFECTED: Table 2 in this Service Bulletin TIME OF COMPLIANCE: Next maintenance event not to exceed 25 hours or before further flight if fuel leak found during preflight inspection