{"id":"F2006B03421","name":"AD/B767/67 - Off-Wing Escape System","slug":"ad-b767-67-off-wing-escape-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42962,"registerId":"commonwealth-F2006B03421-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/67 - Off-Wing Escape System","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 767 Series Aeroplanes\n\n \n\nAD/B767/67 Off-Wing Escape System 7/92\n\nApplicability: Model 767 series, as listed in Boeing SB 767-25-0137 Revision 1. Requirement:  Modify the off-wing escape system IAW Boeing SB 767-25-0137 Revision 1.\n\nNote: FAA AD 92-07-12 Amdt 39-8208 refers.\n\n \n\nCompliance: Prior to 4 November 1993.\n\n \n\nBackground: Reports have been received of operators being unable to adjust the travel on the actuator firing pins to obtain the required engagement, and insufficient connecting bolt length. The actions specified in this Directive are intended to prevent an inadvertent in-flight deployment, or failure to deploy when required for an emergency evacuation.\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":4,"scope_assessment":{"changed":false,"description":"The directive’s scope aligns with the stated original intent in the text: to require modification of the off-wing escape system on the Boeing 767 models listed in the referenced Boeing service bulletin in order to address actuator travel adjustment issues and insufficient connecting bolt length and thereby prevent inadvertent in-flight deployment or failure to deploy. The AD is narrowly targeted to the models listed and to the specific modification specified in the service bulletin, and does not broaden or narrow that purpose within the text provided."},"complexity_factors":["Reference to an external technical document (Boeing SB 767-25-0137 Revision 1) for detailed instructions rather than embedding technical steps in the AD","Safety-critical nature of modifications (actuator firing pins and connecting bolts) requiring certified maintenance competence","A fixed compliance deadline (prior to 4 November 1993) creating scheduling pressure for operators","Limited discretion provided to operators in the AD text (mandated modification, no alternatives described)","Operational impact on aircraft availability (downtime while modifications are performed)"],"plain_english_summary":"### What this directive does\n\nThis Airworthiness Directive requires Boeing 767 aeroplanes to have their off-wing escape system modified in accordance with Boeing Service Bulletin 767-25-0137 Revision 1. (See: “Applicability: Model 767 series, as listed in Boeing SB 767-25-0137 Revision 1.” and “Requirement: Modify the off-wing escape system IAW Boeing SB 767-25-0137 Revision 1.”)\n\nThe directive sets a firm deadline for compliance: the modification must be completed before 4 November 1993. (See: “Compliance: Prior to 4 November 1993.”)\n\n### Who it affects\n\n- Aircraft operators and owners of the Boeing 767 models listed in the referenced Boeing service bulletin. (Applicability)\n- Maintenance organisations and engineers who will perform the modification to the off-wing escape system.\n- Parts suppliers or vendors if replacement or longer connecting bolts or actuator components specified in the service bulletin are required.\n\n### Why it matters (stated purpose and operational effect)\n\nThe directive is issued because operators reported problems adjusting travel on actuator firing pins and insufficient connecting bolt length. The stated objective is to prevent either an inadvertent in-flight deployment of the escape system, or a failure of the escape system to deploy during an emergency evacuation. (See: “Background: Reports have been received ... inability to adjust ... insufficient connecting bolt length ... intended to prevent an inadvertent in-flight deployment, or failure to deploy when required for an emergency evacuation.”)\n\n### How it works mechanically\n\n- The AD makes compliance with the Boeing service bulletin mandatory for the specified 767 models. The service bulletin will describe the parts to be changed or adjusted and the maintenance steps to be taken; the AD itself directs operators to follow that document. (Requirement / Applicability)\n- The AD sets a deadline by which the mandated physical changes must be carried out. (Compliance)\n\n### Who pays, who decides, and how behaviour changes\n\n- Who pays: aircraft operators bear the direct costs (parts, labour, and aircraft downtime) to perform the modification. Maintenance organisations will incur labour costs and scheduling impacts; parts suppliers may receive orders for any replacement components specified in the service bulletin. (Requirement / Applicability)\n- Who decides: the regulator (via this AD) mandates the action and the service bulletin specifies the detailed technical work; operators decide when to schedule the work so long as it is completed by the compliance date. (Requirement / Compliance)\n- Behaviour change: operators must schedule maintenance to install or adjust components per the Boeing SB; maintenance providers must follow the SB procedures and supply appropriate parts or adjustments; operators cannot defer the change past the compliance date without regulatory relief.\n\n### Implementation risks, compliance burden and trade-offs\n\n- Compliance burden: the AD creates a one-off, safety-critical maintenance requirement with a fixed deadline, generating costs in parts, certified labour, and aircraft downtime. (Requirement / Compliance)\n- Technical reliance: the AD requires following an external manufacturer document (the Boeing service bulletin). That shifts detailed technical judgement to the service bulletin and approved maintenance practices. (Applicability / Requirement)\n- Implementation risk: incorrect application of the service bulletin or use of non-conforming parts could reduce the expected safety benefit. The AD does not itself describe alternative corrective actions or provide a tolerance for different methods; compliance requires following the SB. (Requirement)\n- Trade-offs and opportunity cost: operators must divert maintenance slots and resources to meet the AD deadline, which has an opportunity cost in terms of lost revenue or deferred other maintenance.\n\n### Distribution of benefits and costs\n\n- Benefits are concentrated on aircraft, crew and passenger safety for the affected aircraft models if the modification fixes the reported actuator and bolt deficiencies. (Background)\n- Costs are borne chiefly by the operators of the specified 767 models and their maintenance supply chain through required parts, labour and downtime. (Requirement / Applicability)\n\n### Notes on regulatory framing\n\nThe AD is prescriptive: it mandates a specific technical remedy by reference to the Boeing service bulletin and imposes a compliance deadline. The text identifies the safety problem (actuator travel adjustment and bolt length) as the reason for the mandated modification but leaves the exact technical specification and steps to the referenced service bulletin. (Background / Requirement)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on the off-wing escape system modification. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 defined term implicitly referenced (the Boeing service bulletin)","Single, unambiguous compliance requirement with no exceptions or conditions","No cross-references to other legislation beyond a note about the corresponding FAA directive","Simple linear structure: applicability → requirement → compliance date → background"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 767 aircraft.\n\n**What it requires:** Owners and operators of Boeing 767 series planes (as listed in Boeing Service Bulletin 767-25-0137 Revision 1) must modify the \"off-wing escape system\" — that's the emergency evacuation slide/raft system for exits over the wings. The modification must follow the exact instructions in that Boeing service bulletin.\n\n**Why it matters:** There had been reports of two problems: (1) operators couldn't properly adjust the firing pins that trigger the escape system, and (2) the connecting bolts were too short. These defects could cause either:\n- **Inadvertent in-flight deployment** — the escape system accidentally inflating mid-flight (extremely dangerous), or\n- **Failure to deploy in an emergency** — the system not working when passengers actually need to evacuate.\n\n**The deadline:** Aircraft had to be modified before 4 November 1993.\n\n**The bottom line:** This was a time-critical safety fix to ensure emergency evacuation systems work properly — neither going off unexpectedly nor failing when lives depend on them."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-67-off-wing-escape-system","history":"/api/acts/ad-b767-67-off-wing-escape-system/history","analysis":"/api/acts/ad-b767-67-off-wing-escape-system/analysis","conflicts":"/api/acts/ad-b767-67-off-wing-escape-system/conflicts","importantCases":"/api/acts/ad-b767-67-off-wing-escape-system/important-cases","documents":"/api/acts/ad-b767-67-off-wing-escape-system/documents"}}