74-13-04 PIPER: Amendment 39-1875. Applies to PA-28-140 airplanes Serial Numbers 28-25001 to 28-26331 inclusive; 28-26401 to 28-26946 inclusive; 28-7125001 to 28-7125641 inclusive, and 28-7225001 to 28-7425354 inclusive.
Compliance required within the next 50 hours time in service after the effective date of this AD, unless already accomplished.
To prevent the loss of power due to a failed ball joint assembly, accomplish the following:
(a) Remove the lower engine cowl.
(b) Remove the throttle control cable ball joint assembly (P/N 31747-00) from throttle control cable and carburetor throttle lever or alignment bracket if installed.
(c) Accomplish the following in accordance with instructions in Piper Kit 760 780V or an equivalent procedure approved by Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region:
(1) Install Alignment Bracket (Piper Part Number 99929-0) unless already installed to the carburetor throttle lever using two each AN3-5A Machine Bolts, AN960-10 Flat Washers and MS20365-1032C Nuts.
(2) Install spherical rod end bearing (Piper Part Number 452-557) to throttle control cable and the 99929-0 Alignment Bracket using one AN3-10 Machine Bolt, one Piper Part Number 62833-101 Washer, one AN310-3 Nut, one MS24665-132 Cotter Pin and two Piper Part Number 63900-78 Spacers.
(3) Adjust so that the throttle closes completely and has some cushion at the throttle control handle in the cockpit.
(4) Check the inspection hole for visible threads and tighten the jam nut against the rod end.
(d) Replace the lower engine cowl.
Piper Service Letter No. 670 or other approved later revision pertains to this same subject.
This amendment becomes effective June 21, 1974.