Commonwealth legislation

AD/SF340/40 - Motor Operated Fuel Valve Actuator

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This AD mandates that owners/operators of specified SAAB 340B aircraft execute the modifications/inspections set out in SAAB Service Bulletin 340‑28‑016 by 1 May 1994. It responds to findings that electromagnetic interference (e.g. lightning/HIRF) can disable motor‑operated fuel valve actuators, risking fuel leakage or imbalance. Affected operators must fund and arrange the required maintenance to reduce that EMI‑related safety risk.

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AD/SF340/40 - Motor Operated Fuel Valve Actuator

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/SF340/40 Motor Operated Fuel Valve Actuator 2/94

Applicability: Model 340B serial numbers 340B-271 and -275 through -300 inclusive.

Requirement: Action in accordance with SAAB Aircraft AB Service Bulletin SAAB 340-28-016 dated 21 October 1992.

Note: Swedish (LFV) SAD No 1-056 dated 22 October 1992 refers.

Compliance: If not previously accomplished, then no later than 1 May 1994.

Background: The Swedish Airworthiness Authority has advised that Electromagnetic Interference (EMI) tests indicate that the actuator assemblies of certain fuel shut-off valves may fail to function after exposure to EMI, such as lightning or high intensity radiated fields (HIRF). Loss of function of the fuel shut-off valves, if not detected or corrected in a timely manner, could result in unchecked fuel leakage or fuel imbalance. Compliance with this Directive decreases the likelihood of EMI affecting the fuel valves.

Source text

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

1 AD/SF340/40 - Motor Operated Fuel Valve Actuator