{"id":"F2006B02960","name":"AD/B737/60 - Crew Call Horn","slug":"ad-b737-60-crew-call-horn","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42302,"registerId":"commonwealth-F2006B02960-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/60 - Crew Call Horn","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 737 Series Aeroplanes\n\n \n\nAD/B737/60 Crew Call Horn 7/91\n\nApplicability: All model 737 series as listed in the Requirement Document.\n\n \n\nRequirement: Action in accordance with the Technical Requirements of FAA AD 91-09-05.\n\n \n\nNote: SB 737-23-1059 also refers.\n\n \n\nCompliance: Prior to 30 November 1991.\n\n \n\nBackground: This AD is prompted by reports of overheated printed circuit cards caused by horn failures. This condition, if not corrected, could result in damage to adjacent circuitry, smoke and possible fire.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive focused solely on a specific aircraft component (crew call horn). It has not expanded beyond its original purpose of addressing the overheating circuit card issue."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 substantive requirement: comply with external FAA directive","No defined terms section","No conditional logic or nested exceptions","Single compliance deadline with no alternatives","Cross-reference to only 2 external documents (FAA AD and Boeing SB)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or inspections on aircraft.\n\n**What it does:** It orders all Boeing 737 operators to fix a problem with the **crew call horn** — the intercom system that flight attendants use to call the cockpit. The directive requires operators to follow a specific repair procedure set out in an American safety order (FAA AD 91-09-05).\n\n**Why it matters:** The crew call horn's printed circuit cards were overheating and failing. Left unfixed, this could damage nearby electronics, produce smoke, and potentially start a fire on board.\n\n**Who must comply:** All operators of Boeing 737 series aircraft (as listed in the referenced FAA document).\n\n**Deadline:** The fix had to be completed before 30 November 1991.\n\n**Key reference:** Operators could also consult Boeing Service Bulletin 737-23-1059 for technical guidance."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope, as stated in the source, is to require corrective action for crew call horn-related overheating on the applicable Boeing 737 models by adopting the technical requirements of FAA AD 91-09-05. The text provides no indication that the scope has been altered from that stated purpose; it remains limited to the models listed in the Requirement Document and to the actions specified by the referenced FAA AD. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Short, single-issue directive focused on one system (crew call horn) and one corrective source (FAA AD 91-09-05). (Requirement; Background)","External dependency: technical content is contained in an external FAA AD rather than in this instrument, requiring users to obtain and follow that document. (Requirement)","Applicability limited to models listed in an external Requirement Document, so users must consult that document to determine coverage. (Applicability)","Fixed compliance deadline creates operational scheduling considerations but no phased or conditional compliance matrix. (Compliance)","Reference to a related Boeing Service Bulletin (SB 737-23-1059) adds a secondary source to consult but does not itself change obligations. (Note)"],"plain_english_summary":"The AD requires operators of the listed Boeing 737 models to carry out the corrective actions specified in FAA AD 91-09-05 by 30 November 1991 to remedy crew call horn failures that can overheat circuit cards and risk smoke or fire. It affects aircraft owners/operators (and maintenance providers who perform the work), creating direct maintenance costs, downtime and a legal compliance obligation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-60-crew-call-horn","history":"/api/acts/ad-b737-60-crew-call-horn/history","analysis":"/api/acts/ad-b737-60-crew-call-horn/analysis","conflicts":"/api/acts/ad-b737-60-crew-call-horn/conflicts","importantCases":"/api/acts/ad-b737-60-crew-call-horn/important-cases","documents":"/api/acts/ad-b737-60-crew-call-horn/documents"}}