47-41-03 BELL: (Was Mandatory Note 15 of AD-1H-2.) Applies to Models 47B and 47B3 Helicopters.
Compliance required not later than next 50-hour inspection after December 1, 1947.
To prevent failure of the fuel line connecting the fuel shutoff valve and auxiliary fuel pump, replace the rigid aluminum line with a flexible hose line. On Serial Numbers 2 through 5, 7 through 11, 13 and 14, replace P/N 47-686-001-37 with P/N AN 856A6A or AN 6270-6-14.
(Bell Service Bulletin 47C46 dated June 19, 1947, covers the above installation.)