68-18-02 CESSNA: Amendment 39-647. Applies to Model 177, Serial Numbers 661, and 17700001 and 17700003 through 17701164 airplanes.
Compliance: Required within the next 10 hours' time-in-service after the effective date of this airworthiness directive, unless already accomplished.
To prevent failure of the oil pressure gauge line between the engine crankcase and aircraft firewall, accomplish the following:
(A) Replace the copper oil pressure gauge line assembly between the engine crankcase and aircraft firewall with a flexible hose assembly in accordance with Cessna Service Letter No. SE68-14, Supplement No. 1, dated August 23, 1968, or any equivalent modification approved by the Chief, Engineering and Manufacturing Branch, Central Region.
This amendment becomes effective September 5, 1968.