Yak-52: Service Bulletins

The full list contains above a hundred entries, in PDF format (Adobe Acrobat). All of them result from a thorough structural research conducted by the Yakovlev Design Bureau and some of them were pushed to life by accidents.

The most known are the 59R/60R (heavy spar) and 107BD (additional spar reinforcement). These two vital bulletins can only be implemented by a certified overhaul facility using the necessary special equipment (jigs) and certified parts.

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