64-10-04 PIPER: Amdt. 728 Part 507 Federal Register May 12, 1964. Applies to Model PA-24-250 Aircraft,
Compliance required within 50 hours' time in service after the effective date of this AD.
In order to prevent portions of the carburetor air box deflector vanes from breaking loose and lodging within the carburetor throat, remove the deflector vanes from the air box, P/N 21943- 03, in accordance with Piper Service Letter No. 420. Upon removal of these vanes, the air box P/N becomes 21943-05.
(Piper Service Letter No. 420 dated March 5, 1964, covers this subject.)
This directive effective May 12, 1964.