Commonwealth legislation

AD/CESSNA 170/40 - Mixture Control Connection

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Commonwealth

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legislative instrument

Plain English Summary

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Orders owners/operators of Cessna 172RG aeroplanes (S/Ns 172RG‑0001 to 172RG‑0573) to inspect the carburettor mixture‑control connection and ensure specified washers, clamp (P/N S2323‑11) and retaining nut (MS20365‑1032C) are fitted and torqued so the clamp can swivel. If assembled incorrectly, the nut must be replaced, washers fitted in sequence and torque set to at least 15 inch‑pounds, then verified.

Compliance is required within 25 hours time‑in‑service after 7 October 1980. Owners/operators pay inspection and repair costs. The stated purpose is to prevent control‑wire slippage that may cause engine power loss.

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AD/CESSNA 170/40 - Mixture Control Connection

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes

AD/CESSNA 170/40 Mixture Control Connection 10/80

Applicability: Model 172RG with S/Nos 172RG-0001 to 172RG-0573.

Requirement: (a) Inspect the mixture control connection at the carburettor mixture arm to ensure that the control cable inner wire is secured to the clamp at the arm with an AN960-10 (approx 063ins. thick) washer installed between wire and retaining nut and an AN960-10L (approx .032ins. thick) washer installed between wire and arm.

(b) If the parts are assembled correctly, check that the minimum torque on the MS20365-1032C retaining nut is 15 inch-pounds and that the P/N S2323-11 clamp will swivel in the mixture control arm.

(c) If the parts are assembled incorrectly, remove and discard the MS20365-1032C nut. Install washers in correct sequence and fit new MS20365-1032C nut. Torque nut to 15 inch-pounds minimum and ensure that P/N S2323-11 clamp will swivel in the mixture control arm.

Compliance: Within 25 hours time in service after 7 October 1980.

Background: Incorrect assembly of the mixture control connection during manufacture may cause slippage of the control wire and result in engine power loss due to lean mixture.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/CESSNA 170/40 - Mixture Control Connection