68-23-08 BELLANCA: Amendment 39-679. Applies to Model 14-19-3A (Serial Numbers 4229 through 4342) and Model 17-30 (Serial Numbers 30001 through 30151) airplanes.
Compliance required as indicated:
To prevent vibration of the horizontal tail surfaces, and to correct inaccurate airspeed indication, accomplish the following:
A) On or before November 22, 1969, unless already accomplished, modify the elevator trim tab system by the installation of redesigned elevator trim tab and actuation rod and all related changes in accordance with Part A of Bellanca Service Letter No. 46, dated October 28, 1968, or any other method approved by Chief, Engineering and Manufacturing Branch, Central Region, Federal Aviation Administration.
B) Unless already accomplished, after completion of the modifications required by Paragraph A, the restricted forward center of gravity limit must be incorporated into the respective Airplane Flight Manuals by accomplishing the following:
(1)To the Model 14-19-3A Airplane Flight Manual, add Revision No. 5 dated October 26, 1968.
(2) To the Model 17-30 Airplane Flight Manual, add Revision No. 4 dated August 28, 1968.
C) Until the elevator trim tab has been modified in accordance with Paragraph A, operation of the airplane in excess of 180 miles per hour (156 knots) is prohibited.
D) Until the elevator trim tab has been modified in accordance with Paragraph A, a placard must be installed in the airplane adjacent to the airspeed indicator, in full view of the pilot with the following wording:
"NEVER EXCEED SPEED 180 MPH (156 KNOTS) IAS".
E) Within the next 25 hours' time-in-service after the effective date of this airworthiness directive, unless already accomplished, modify or replace the static vent buttons in accordance with Part B of Bellanca Service Letter No. 46, dated October 28, 1968, or any other method approved by Chief, Engineering and Manufacturing Branch, Central Region, Federal AviationAdministration.
AD 68-12-02 is hereby superseded.
This amendment becomes effective November 22, 1968.