47-31-02 NAVION: (Was Mandatory Note 11 of AD-782-3.) Applies to Serial Numbers NAV-4-2 Through NAV-4-850.
To be accomplished not later than November 1, 1947.
Remove carburetor vapor return line hose P/N 75696 and install fire-resistant hose P/N 76701. This change is necessary to prevent premature failure of the vapor return line in the event of an engine compartment fire.
(NAA Field Service Bulletin No. 23 dated April 11, 1947, covers this rework.)