Cc5 Posted July 8, 2021 Share Posted July 8, 2021 Greetings, We’ve been having an ongoing RTRU issue that only occurs in flight, usually a couple of times during touch and gos/takeoff. TR3 load will drop below 5, kick out a fail for 2-3 seconds then recover and go back to functioning properly. A few things we’ve changed include the TR unit, BIU, as well as the associated diode. Was curious if anyone has seen a similar issue or has any input on potential culprits. All meter readings weve checked have been good, as it does not fail on ground. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted July 8, 2021 Share Posted July 8, 2021 7 hours ago, Cc5 said: Greetings, We’ve been having an ongoing RTRU issue that only occurs in flight, usually a couple of times during touch and gos/takeoff. TR3 load will drop below 5, kick out a fail for 2-3 seconds then recover and go back to functioning properly. A few things we’ve changed include the TR unit, BIU, as well as the associated diode. Was curious if anyone has seen a similar issue or has any input on potential culprits. All meter readings weve checked have been good, as it does not fail on ground. Model of aircraft Best regards Munir Abbasi Quote Link to comment Share on other sites More sharing options...
Cc5 Posted July 9, 2021 Author Share Posted July 9, 2021 Sorry, HC-130J. Quote Link to comment Share on other sites More sharing options...
Cc5 Posted August 24, 2021 Author Share Posted August 24, 2021 Still dealing with this issue unfortunately. We noticed during takeoff tr3 load skyrockets 15%+ above tr1 inducing a dc bus overload. It will repeatedly fail and recover for 2 seconds a handful of times only during takeoffs. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted August 24, 2021 Share Posted August 24, 2021 6 hours ago, Cc5 said: Still dealing with this issue unfortunately. We noticed during takeoff tr3 load skyrockets 15%+ above tr1 inducing a dc bus overload. It will repeatedly fail and recover for 2 seconds a handful of times only during takeoffs. Check grounding /bonding wire of unit regards Munir Abbasi Quote Link to comment Share on other sites More sharing options...
tinyclark Posted August 27, 2021 Share Posted August 27, 2021 Sorry, don't have any experience on the J models, or any tech data. What base are you at? I don't know if there are any relays involved in the DC system on those birds, but if there are, swap two of them. I would also check the AC input connections to the TRs. Quote Link to comment Share on other sites More sharing options...
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