47-21-17 REPUBLIC: (Was Mandatory Note 7 of AD-769-2.) Applies to Model RC-3 Aircraft Serial Numbers 5 to 125, Inclusive.
To be accomplished not later than the next 25 hours of operation subsequent to July 1, 1947, and in any case not later than September 1, 1947.
In order to provide an improved backfire screen, remove existing screen from flexible hot air tube, install new type screen with flush end locating it to prevent interference with the carburetor air duct or the old screen which will be reinstalled. Securely attach new screen to tube.
(Republic Seabee Bulletin No. 2 covers this same subject.)