Jésus Ballester has writen a document (which I have crudely translated via Google Translate) that lists the modifications that were introduced by the Spanish air force and by Bucker Prado to counter the difficulties experienced in operating th CASA 1131 Jungmann in training, often from less than perfect runways.

Both the Engligh and Spanish language versions are to be found in the "Jesus Ballester collection" within the Documents/Downloads section of the website. Look for "Achilles heel".

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Thank you again to Jésus for providing this valuable information.