{"id":"F2006B06993","name":"AD/SF340/64 - Landing Gear Electrical Relay 15GA","slug":"ad-sf340-64-landing-gear-electrical-relay-15ga","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48601,"registerId":"commonwealth-F2006B06993-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/64 - Landing Gear Electrical Relay 15GA","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSAAB SF340 Series Aeroplanes\n\nAD/SF340/64 Landing Gear Electrical Relay 15GA 7/98\n\nApplicability: SAAB 340B series aeroplanes with serial numbers 380 through 499 inclusive. Requirement: Perform the following actions in accordance with SAAB Aircraft AB Service Bulletin\n\nSAAB 340-32-115 dated 7 April 1998:\n\n    inspect relay 15GA, the relay socket and related wiring harness,\n\n    b. change the nut-plate (captive nuts) in the flight deck floor,\n\n    c. flight idle stop solenoid test,\n\n    d. functional test of the active noise system, and\n\n    e. operational test of the fluorescent lamps.\n\nNote: LFV AD 1-125 refers.\n\nCompliance: Within 400 hours time in service from the effective date of this directive.\n\nThis airworthiness directive becomes effective on 18 June 1998.\n\nBackground: 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.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive (AD) — a targeted safety instrument with narrow, specific scope. It addresses exactly one identified safety defect in one aircraft type. There is no indication of scope creep; ADs are inherently limited to discrete technical fixes."},"complexity_factors":["Single, discrete technical requirement with clear mechanical scope","Only 5 specific maintenance tasks listed (a through e)","No defined terms section or complex interpretive provisions","Single cross-reference to Swedish authority directive (LFV AD 1-125) for context only","Clear compliance deadline (400 hours time in service)","No conditional logic, exceptions, or nested provisions","Narrow applicability (specific aircraft serial number range only)"],"plain_english_summary":"This mandatory safety order targets SAAB 340B aeroplanes (serials 380–499) after discovery that fluid leaking through cockpit-floor holes can contaminate relay 15GA, short a circuit breaker and prevent landing-gear extension. Owners/operators (about 120 aircraft) must perform specified inspections, replacements and tests within 400 flight hours of 18 June 1998 to remove the contamination risk. Compliance prevents possible landing-gear failures on approach."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive implements a targeted corrective programme addressing relay contamination risk for a defined fleet subset. It does not expand applicability beyond the specified serial numbers or add unrelated obligations; it prescribes inspections, a hardware change and functional tests as remediation."},"complexity_factors":["Narrow applicability by aircraft model and serial-number range (SAAB 340B s/n 380–499)","Relies on an external manufacturer's service bulletin (SAAB 340‑32‑115) for procedural detail","Multiple distinct actions required: inspection, hardware change (nut‑plates), and several functional tests","Safety‑critical consequence (landing gear extension) increases implementation scrutiny and possible scheduling impact","Compliance deadline expressed in flight hours (400 hours) requiring operators to track utilisation for timing","Cross‑reference to foreign airworthiness directive (LFV AD 1‑125) adds traceability considerations"],"plain_english_summary":"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."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-64-landing-gear-electrical-relay-15ga","history":"/api/acts/ad-sf340-64-landing-gear-electrical-relay-15ga/history","analysis":"/api/acts/ad-sf340-64-landing-gear-electrical-relay-15ga/analysis","conflicts":"/api/acts/ad-sf340-64-landing-gear-electrical-relay-15ga/conflicts","importantCases":"/api/acts/ad-sf340-64-landing-gear-electrical-relay-15ga/important-cases","documents":"/api/acts/ad-sf340-64-landing-gear-electrical-relay-15ga/documents"}}