EASA SIB SAFO15007
Pratt & Whitney R-985 (Wasp Junior) Engines — Flyweight Hardware Failures
SAFO 15007 is a Safety Alert for Operators issued by the FAA regarding Pratt & Whitney R-985-AN-14B (Wasp Junior) engines. It addresses failures caused by fatigued flyweight screws and improperly modified or under-torqued expanders, which have led to in-flight engine failures and forced landings. The alert also applies to other Pratt & Whitney Wasp Jr (R-985 Series) and Wasp (R-1340 Series) engines used in various aircraft including Air Tractor AT-301 and 401, Ayres Thrush, Beechcraft D17 and 18 series, Boeing-Stearman 75, de Havilland DHC-2 and DHC-3, Gee Bee, Grumman G-21 and G-164, Howard DGA-6, -11, -15, North American T-6, and Weatherly 201 and 620.
Safety Information BulletinMaintenanceSafety MgmtAir Tractor AT-301Air Tractor AT-401Ayres ThrushBeechcraft D17Beechcraft 18Boeing-Stearman 75de Havilland DHC-2de Havilland DHC-3Gee BeeGrumman G-21Grumman G-164Howard DGA-6Howard DGA-11Howard DGA-15North American T-6Weatherly 201Weatherly 620