The chronic under-recording of defects on MRs is partly attributable to the persistent folklore that any and all defects entered on an MR result in the aircraft being ‘grounded’. But only partly. In the case of Partenavia VH-IXH the MR should have been endorsed: “Deathtrap”.
Then there’s the chronic problem of pilots who either don’t read or don’t understand an MR anyway.
Some pilots deserve the nickname “Deathwish”. Pity the poor bastards who are/were their passengers.
That’s a few decades and a few hundred millions in regulatory ‘reform’ for ya!