New_Acanthaceae709 t1_j6kwntd wrote
Reply to comment by deformi in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
Every six to ten years, aircraft go in for a "D check", where they disassemble the whole thing, replace anything corroded or worn out, and put it all back together again.
The lighter weight "C check" is more often, but is 4000+ hours of time to do.
If you're doing the once-a-decade style service, it feels time to replace the plugs from 25+ years back. ;-)
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