Hamilton Standard 14RF19 Propeller blade section pitch control incorrect modification. SDR 510017775
A number of pitch control units (PCUs) assembled incorrectly by the vendor. This incorrect assembly returns the PCUs to a pre-SB configuration which can reduce reliability. P/No: 78249055AND78249052.
Hartzell HCB4MP3C Propeller assembly spring cracked. SDR 510017765 (photo above)
Broken spring found during dismantling of the propeller at overhaul. The spring is of the old style referred to in Hartzell service letter HC-SB-61-324. P/No: A3496. TSN: 10,254 hours TSO: 2518 hours/43 months