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Service Letter: Reinforcement of Model 4000 float hull bulkheads
Serial Letter Number: 25
Applicable Aircraft: C206 or C185 with 4000 floats
Applicable Serial Numbers: 40001-40016, 40019-40022, 40025-40054, 40057-40060, 40074-75
Revision:
Release Date: 05/01/1992
