80-19-08: Fuel/Air Mixture

80-19-08 CESSNA: Amendment 39-3902. Applies to Model 172RG (S/N 172RG0001 through 172RG0573) airplanes certificated in all categories. COMPLIANCE: Required as indicated unless already accomplished. To preclude slippage of the mixture control wire at the carburetor fuel mixture control arm and resultant power loss due to a lean fuel/air mixture, within the next 25 hours time-in-service after the effective date of this AD, accomplish the following: A) Visually inspect the mixture control connection on the right side of the carburetor for correct assembly. Assure that (1) Cessna Part Number (P/N) 9862010-9 mixture control assembly wire is secured to the Cessna P/N S2323-11 clamp at the carburetor mixture control arm with an AN960-10 (approximately .063 inch thick) washer installed between the mixture control wire and the MS20365-1032C nut and (2) an AN960-10L (approximately .032 inch thick) washer is installed between the mixture control wire and the mixture controlarm. B) If the parts are assembled per Paragraph A), check to assure that the minimum torque on the MS20365-1032C nut is 15 inch-pounds and that the Cessna P/N S2323-11 clamp will swivel in the mixture control arm. Make the prescribed entry in the aircraft maintenance records indicating compliance with this AD and no further action is required. C) If the parts are not assembled per Paragraph A) remove and discard the MS20365-1032C nut. Install washers in the positions specified by Paragraph A) and install a new MS20365-1032C nut. Torque the nut to 15 inch-pounds minimum and assure that the Cessna P/N S2323-11 clamp will swivel in the mixture control arm. D) Airplanes may be flown in accordance with FAR 21.197 to a location where the inspection required by Paragraph A) may be accomplished. E) Any equivalent method of compliance with this AD must be approved by the Chief, Aircraft Certification Program, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209; Telephone (316) 942-4285. This amendment becomes effective September 15, 1980.