{"id":"F2006B05164","name":"AD/CESSNA 188/29 - Induction Air Box Seal","slug":"ad-cessna-188-29-induction-air-box-seal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45282,"registerId":"commonwealth-F2006B05164-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 188/29 - Induction Air Box Seal","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)  Cessna 188 (Agwagon) Series Aeroplanes\n\n \n\nAD/CESSNA 188/29 Induction Air Box Seal 6/77\n\nApplicability: Model 188 with S/Nos. 18800001 to 18802348. Model A188 with S/Nos. 18800001 to 18800707.\n\nRequirement: Action in accordance with Cessna SL No. SE76-18.\n\n \n\nNote: FAA AD 77-04-05 Amendment 39-2838 refers.\n\n \n\nCompliance: Within 100 hours time in service after 30 June 1977.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets a specific, narrow scope (particular models and serial numbers) and a clear compliance action (follow Cessna SL No. SE76-18) with a defined deadline. There is no indication within this instrument that its scope has been expanded or narrowed from an earlier intent; the AD simply prescribes the action for the listed aircraft and references the service letter and related FAA AD."},"complexity_factors":["Narrow technical scope limited to specific serial-number ranges (Applicability).","Mandatory cross-reference to an OEM service letter for the actual technical work (Requirement).","Fixed and relatively short compliance timeframe (100 hours TIS after 30 June 1977) (Compliance).","Dependence on external documents (Cessna SL No. SE76-18 and FAA AD 77-04-05) for substantive detail (Requirement, Note).","Low regulatory discretion in the AD text itself—operators must comply or seek formal alternative approvals (Requirement)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Cessna 188 (S/N 18800001–18802348) and A188 (S/N 18800001–18800707) to carry out the induction air box seal work specified in Cessna Service Letter SE76‑18 within 100 hours TIS after 30 June 1977. Compliance is mandatory for continued operation, with inspection/repair costs and downtime borne by operators; technical procedures and any parts requirements are set out in the referenced service letter."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive from 1977 addressing a specific mechanical defect in a limited aircraft population. There is no evidence of scope creep; it remains precisely focused on the induction air box seal issue as originally intended."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 defined applicability criteria (serial number ranges)","Single cross-reference to external document (Cessna Service Letter SE76-18)","No nested conditions, exceptions, or defined terms section","Simple compliance deadline (100 hours time in service after fixed date)","Straightforward mechanical requirement with no alternative methods of compliance stated"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific Cessna 188 agricultural aircraft (often called 'Agwagons') built between certain serial numbers.\n\n**What it does:**\n- Requires owners/operators of affected Cessna 188 and A188 model planes to inspect or replace the **induction air box seal** — a rubber or foam seal that sits where the engine breathes in air. If this seal fails, the engine can suck in unfiltered air (including dust and debris), causing serious damage.\n\n**Who must act:**\n- Anyone operating a Cessna 188 with serial numbers 18800001 through 18802348, or an A188 with serial numbers 18800001 through 18800707.\n\n**What they must do:**\n- Follow the instructions in **Cessna Service Letter SE76-18** (a manufacturer bulletin). The exact repair isn't spelled out here — operators must look up that separate document.\n\n**When:**\n- Within 100 hours of flying time after 30 June 1977.\n\n**Why it matters:**\n- This prevents engine failure in agricultural aircraft that often operate in dusty conditions. A compromised air seal can destroy an engine mid-flight, with obvious safety risks for the pilot and people on the ground.\n\n**Note:** This references an equivalent American FAA directive (77-04-05), showing Australia was harmonising its safety rules with the United States."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-188-29-induction-air-box-seal","history":"/api/acts/ad-cessna-188-29-induction-air-box-seal/history","analysis":"/api/acts/ad-cessna-188-29-induction-air-box-seal/analysis","conflicts":"/api/acts/ad-cessna-188-29-induction-air-box-seal/conflicts","importantCases":"/api/acts/ad-cessna-188-29-induction-air-box-seal/important-cases","documents":"/api/acts/ad-cessna-188-29-induction-air-box-seal/documents"}}