{"id":"F2006B07487","name":"AD/TSA-600/22 - Cabin Door Upper Section - Modification","slug":"ad-tsa-600-22-cabin-door-upper-section-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49930,"registerId":"commonwealth-F2006B07487-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/22 - Cabin Door Upper Section - 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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\n \n\nAD/TSA-600/22 Cabin Door Upper Section - Modification 11/79\n\nApplicability: All model 600 with S/Nos. 60-0001 to 60-0056; and All model 601 with S/Nos. 61-\n\n0001 to 61-0070.\n\n \n\nRequirement: Install in the cabin door upper section latching mechanism, spacers and the locking position visual indicators in accordance with Aerostar SB No. 600-35.\n\n \n\nNote: FAA AD 79-18-10, Amdt. 39-3535 refers.\n\n \n\nCompliance: Unless already accomplished, within 100 hours time in service after 30 November 1979.\n\n \n\nBackground: This Directive adds the modification action of Aerostar SB 600-35 to prevent inflight loss of the cabin upper door section.\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":2,"scope_assessment":{"changed":false,"description":"The directive’s scope as stated (affected models/serial numbers; required modification; compliance within 100 hours after 30 November 1979) is set out in the text and shows no indication of a change from its stated purpose. The document requires a specific modification for the listed aircraft and provides the compliance timeframe; there is no amendment or expansion of applicability or requirements contained in this text."},"complexity_factors":["Narrow, specific applicability limited to two model/serial-number ranges (Applicability).","Single, clearly described technical action: install specified parts per a named Service Bulletin (Requirement).","Compliance deadline expressed in flight hours (100 hours TIS) rather than calendar time, adding modest scheduling complexity (Compliance).","Dependence on an external document (Aerostar SB No. 600-35) for the detailed procedure increases operational dependency on the manufacturer SB (Requirement).","Reference to an external regulator's AD (FAA AD 79-18-10) requires cross-checking but does not change the domestic requirement (Note)."],"plain_english_summary":"What this changes mechanically\n\n- The directive requires physical modification of the cabin door upper section: installation of a new latching mechanism, spacers, and locking-position visual indicators. The installation must follow the instructions in Aerostar Service Bulletin No. 600-35. (Requirement)\n\nWho it applies to\n\n- Applies to Aerostar model 600 aircraft with serial numbers 60-0001 through 60-0056, and Aerostar model 601 aircraft with serial numbers 61-0001 through 61-0070. (Applicability)\n\nWho decides and who pays\n\n- The Civil Aviation Safety Authority issued the directive under the Commonwealth Civil Aviation Regulations framework. Compliance is mandatory for the listed aircraft unless the modification has already been carried out. The operators/owners of the affected aircraft bear the cost, time, and logistical effort required to perform the modification. (header; Requirement; Compliance)\n\nWhen it must be done\n\n- If not already done, the modification must be completed within 100 hours time in service after 30 November 1979. That deadline is measured in aircraft flight hours rather than calendar days. (Compliance)\n\nWhy it was issued (stated purpose) and how that maps to costs and incentives\n\n- The advisory states the modification’s purpose is to prevent in‑flight loss of the cabin upper door section. (Background)\n- The technical act required (installing a latching mechanism, spacers and visual indicators per the Service Bulletin) creates a one-off compliance cost for each affected aircraft owner/operator: parts, labour, and downtime while the work is done. (Requirement; Compliance)\n- Because the AD mandates a specific modification method (the Aerostar SB No. 600-35), operators have limited freedom to choose alternative fixes unless those alternatives are separately approved. That channels compliance activity to the SB procedure. (Requirement)\n\nOperational and implementation points to note\n\n- The AD references an FAA airworthiness directive (FAA AD 79-18-10), indicating coordination or consistency with an external regulatory action; operators may consult that document for additional context. (Note)\n- The compliance timeline measured in flight hours can affect scheduling: owners must track hours to meet the 100-hour requirement. (Compliance)\n- The directive does not set out a penalty or enforcement mechanism in this text; it states the technical and timing requirement. The issuing authority is the Civil Aviation Safety Authority. (header; Requirement; Compliance)\n\nTrade-offs, risks and likely effects on behaviour (mechanical and economic)\n\n- Owners will incur a direct cost and temporary loss of aircraft availability to install the modification. (Requirement; Compliance)\n- The mandated modification reduces operators’ choice of remedy by specifying the Service Bulletin method, which concentrates the implementation route and its associated suppliers and labour. (Requirement)\n- The stated safety benefit (prevention of in‑flight loss of the upper door section) is the concentrated benefit to the affected aircraft and their occupants; costs are borne by the owners/operators of the specified serial-numbered aircraft. (Background; Applicability)\n\nSource citations\n\n- Issuing authority and legislative context: Commonwealth of Australia (Civil Aviation Regulations 1998), Part 39; Civil Aviation Safety Authority. (header)\n- Applicability: serial-numbered model lists. (Applicability)\n- Required work: install latching mechanism, spacers and locking-position visual indicators per Aerostar SB No. 600-35. (Requirement)\n- Compliance timing: within 100 hours time in service after 30 November 1979. (Compliance)\n- Purpose stated by the directive: prevent inflight loss of the cabin upper door section. (Background)\n- Cross-reference: FAA AD 79-18-10. (Note)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on cabin door modifications for a limited aircraft population. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, discrete technical requirement with no conditional logic or exceptions","Only 2 defined applicability criteria (model numbers and serial number ranges)","No cross-references to other legislation beyond a single note referencing the equivalent FAA directive","Straightforward compliance deadline with single exception clause ('unless already accomplished')","Total length is approximately 150 words"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Aerostar 600 and 601 model aeroplanes** (specific serial numbers listed) to modify the cabin door's upper section. The fix involves installing:\n- A new latching mechanism\n- Spacers\n- Visual indicators to show when the door is properly locked\n\n**Who it affects:**\nAnyone who owns or operates the affected Aerostar aircraft (models 600 with serial numbers 60-0001 through 60-0056, and models 601 with serial numbers 61-0001 through 61-0070).\n\n**Why it matters:**\nWithout this modification, the upper section of the cabin door could break away during flight — a serious safety hazard. The directive references an Aerostar Service Bulletin (SB 600-35) which provides the technical instructions for the fix.\n\n**Compliance deadline:**\nThe work had to be completed within 100 hours of flying time after 30 November 1979 (unless already done)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-22-cabin-door-upper-section-modification","history":"/api/acts/ad-tsa-600-22-cabin-door-upper-section-modification/history","analysis":"/api/acts/ad-tsa-600-22-cabin-door-upper-section-modification/analysis","conflicts":"/api/acts/ad-tsa-600-22-cabin-door-upper-section-modification/conflicts","importantCases":"/api/acts/ad-tsa-600-22-cabin-door-upper-section-modification/important-cases","documents":"/api/acts/ad-tsa-600-22-cabin-door-upper-section-modification/documents"}}