EASA SIB 2012-16R1
Hydraulic Systems — Implementation of automatic Power Transfer Unit inhibition logic
EASA Safety Information Bulletin 2012-16R1 is an informational bulletin addressing hydraulic system improvements on Airbus A318, A319, A320, and A321 aircraft. It informs operators about the implementation of automatic Power Transfer Unit (PTU) inhibition logic designed to prevent overheating and failure of a second hydraulic system following a single hydraulic system failure with fluid loss. The bulletin references Airbus Service Bulletins that provide retrofit and activation instructions for this safety enhancement.