{"id":"F2006B10813","name":"AD/INST/12 - SEP 6 Automatic Pilot Roll Computer Clutch Circuit - Modification","slug":"ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56291,"registerId":"commonwealth-F2006B10813-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/12 - SEP 6 Automatic Pilot Roll Computer Clutch Circuit - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Instruments and Automatic Pilots\n\n \n\nAD/INST/12 SEP 6 Automatic Pilot Roll Computer\n\nClutch Circuit - Modification\n\nApplicability: SEP 6 roll computer 83SUE3. Document:  Smiths SB 22-778.\n\nCompliance: Within 3000 hours time in service after 30 April 1975.\n\n\n2/75\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2530},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope: a specific safety modification to one model of autopilot roll computer. There is no expansion beyond this targeted technical requirement."},"complexity_factors":["Single applicability criterion targeting one specific part number (83SUE3)","Single compliance action (one modification procedure)","Simple temporal condition based on hours-in-service after a fixed date","No definitions section, cross-references, or exceptions"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety instruction issued under civil aviation law that applies to aircraft owners and operators.\n\n**Who it affects:** Anyone operating an aircraft fitted with a specific autopilot component: the **SEP 6 roll computer (model 83SUE3)**.\n\n**What you must do:** Modify the **clutch circuit** in this roll computer. The work must follow the exact instructions in **Smiths Service Bulletin 22-778** (the manufacturer's technical manual).\n\n**When to do it:** Within **3,000 hours of flight time** after 30 April 1975. This is calculated based on the aircraft's flight hours (time in service).\n\n**Why it matters:** This modification fixes a safety defect in the autopilot's clutch circuit, ensuring the automatic pilot system can reliably control the aircraft's roll (banking/turning) without mechanical failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification","history":"/api/acts/ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification/history","analysis":"/api/acts/ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification/analysis","conflicts":"/api/acts/ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification/conflicts","importantCases":"/api/acts/ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification/important-cases","documents":"/api/acts/ad-inst-12-sep-6-automatic-pilot-roll-computer-clutch-circuit-modification/documents"}}