Selecting the landing gear "down" produced an unsafe nose gear indication. Manual gear extension proved unsuccessful. The nose landing gear collapsed upon landing. Inspection revealed the nose land-rning gear linkage adjusting fork (p 5045211-2) had fractured, preventing extension of the nose landing gear to a down and locked position. Evidencernsuggests this fracture was progressive in nature, and some degradation to the component's structure existed prior to failure.
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