Commonwealth legislation

AD/SF340/64 - Landing Gear Electrical Relay 15GA

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legislative instrument

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This airworthiness directive requires operators of SAAB 340B aeroplanes (serial numbers 380–499) to inspect landing‑gear relay 15GA, its socket and wiring, replace nut‑plates in the cockpit floor, and perform specified solenoid, noise‑system and lamp functional tests per SAAB Service Bulletin 340‑32‑115. CASA requires completion within 400 flight‑hours because fluid entering through cockpit carpet attachment holes can contaminate the relay, short circuit breaker 7GA and prevent normal landing‑gear extension. Operators pay for inspections, parts and labour.

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AD/SF340/64 - Landing Gear Electrical Relay 15GA

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/SF340/64 Landing Gear Electrical Relay 15GA 7/98

Applicability: SAAB 340B series aeroplanes with serial numbers 380 through 499 inclusive. Requirement: Perform the following actions in accordance with SAAB Aircraft AB Service Bulletin

SAAB 340-32-115 dated 7 April 1998:

inspect relay 15GA, the relay socket and related wiring harness,

b. change the nut-plate (captive nuts) in the flight deck floor,

c. flight idle stop solenoid test,

d. functional test of the active noise system, and

e. operational test of the fluorescent lamps.

Note: LFV AD 1-125 refers.

Compliance: Within 400 hours time in service from the effective date of this directive.

This airworthiness directive becomes effective on 18 June 1998.

Background: The Swedish airworthiness authority has received a number of reports of landing gear control circuit breaker 7GA opening, thus preventing normal landing gear extension which may result in the landing gear not being locked down. This is caused by a short-circuit in relay 15GA. Further investigation has determined that fluid leaking through carpet attachment holes on the cockpit floor is contaminating the relay.

Source text

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

1 AD/SF340/64 - Landing Gear Electrical Relay 15GA