Commonwealth legislation

AD/CESSNA 170/34 Amdt 1 - Engine Mounting Bracket Bolts

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legislative instrument

Plain English Summary

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This directive requires owners/operators of certain Cessna 172N aeroplanes with Lycoming 0-320-H2AD engines to inspect eight engine-mounting bolts, re-torque them to 360 in‑lb or replace any measuring under 200 in‑lb. Checks must be done within 10 hours after the effective date and then every 100 hours; authorised maintenance personnel perform the checks and decide replacements (Requirement; Compliance). The amendment widens applicability by listing engine serial numbers and adding engines remanufactured before 4 January 1979 (Background).

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AD/CESSNA 170/34 Amdt 1 - Engine Mounting Bracket Bolts

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 170/34

Amdt 1

Engine Mounting Bracket Bolts 9/80

Applicability: All Cessna Model 172N fitted with Lycoming 0-320-H2AD series engines with S/Nos L-101-76 to L-5707-76 or any engine remanufactured prior to 4 January 1979.

Requirement: To prevent loss of integrity of the engine to aircraft mounting due to loosening of the engine mounting bracket attaching bolts, accomplish the following:

Inspect the eight P/N LW 38-2.75 mounting bolts for tightness. Mounting bolts found to have less than 200 inch-pounds of torque when measured in the tightening direction must be replaced and the new bolts torqued to 360 inch-pounds.

2. Those bolts found with less than 360 inch-pounds torque but more than 200 inch- pounds must be re-torqued to 360 inch-pounds.

Note: Lycoming SI No 1380 and FAA AD 79-10-03 R2 Amendment 39-3628 refers.

Compliance: Unless already accomplished, within 10 hours time in service after 1 August 1980 and thereafter at intervals not exceeding 100 hours time in service.

Background: The engine mounting bracket bolts may lose torque during service. This amendment references affected engines by serial number and adds certain remanufactured engines.

Source text

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

1 AD/CESSNA 170/34 Amdt 1 - Engine Mounting Bracket Bolts