Thank you for choosing Aerospace-Aviation360 for Part Number 5965772 described as Test Set, Fault Indication - Conv/Epcu. Tests Wire Integrity Of Conv Electronic Unit And Epcu Feeder Fault And Epcu Tie Lockout Alerts. Mrb Requirement At 4C Check. by Mcdonnell Douglas. This is an ASAP Semiconductor owned and operated website. We are a leading supplier of aircraft tooling parts. You have 24/7 x 365 access to our diverse product database with the fastest lead times in the industry.