Commonwealth legislation

AD/SF340/63 - Airfoil De-Icing - Introduction of New Improved Check Valve

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This airworthiness directive requires fitment of an improved check valve to certain SAAB 340B aeroplanes (serials 240–430) that have BF Goodrich check valves P/N 3D3511, by following SAAB Service Bulletin 340-30-080. Compliance is mandatory within six months of the directive (effective 29 January 1998). It supersedes AD/SF340/56. The move responds to in-service valve failures that can disable airfoil de‑ice during single‑engine operation; operators must install the part and bear the compliance cost and downtime risk.

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AD/SF340/63 - Airfoil De-Icing - Introduction of New Improved Check Valve

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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SAAB SF340 Series Aeroplanes

AD/SF340/63 Airfoil De-Icing - Introduction of New Improved Check Valve

2/98

Applicability: SAAB 340B series aircraft serial number 240 through 430 (inclusive) with installed Check Valves BF Goodrich P/N 3D3511.

Requirement: Install improved check valves in accordance with SAAB Service Bulletin 340-30- 080.

Note: SAD N0. 1-120 refers.

Compliance: Within six months of the effective date of this directive.

This airworthiness directive becomes effective on 29 January 1998.

Background: Operational tests on a SAAB 340 aircraft after engine change showed that the check valves had failed. Failed check valves may result in loss of airfoil de-ice system operation during single engine operation. A previous Service Bulletin introduced a design improvement (SAAB SB 340-30-069) and this was mandated at AD/SF340/56. Subsequent service experience has shown that this design was also defective. This AD cancels and supersedes AD/SF340/56 and gives instructions for the replacement or modification of check valves.

Source text

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

1 AD/SF340/63 - Airfoil De-Icing - Introduction of New Improved Check Valve