59-23-03 FAIRCHILD: Applies to F-27 Series aircraft Serial Numbers 1 to 63 inclusive.
Compliance required not later than December 1, 1959.
(a) The present cartridge unit in the fire extinguisher system has been found to be unreliable above 20,000 feet. Modified cartridge units must therefore be installed to insure reliability above 20,000 feet.
(b) Remove four Fenwal fire extinguisher cartridge units, P/N 690202-2, attached to main and reserve fire extinguisher bottles located in left and right nacelles, and replace with new Fenwal fire extinguisher cartridge units, P/N 6900202-3.
(Fairchild F-27 Service Bulletin No. 26-1 covers this same subject.)