{"id":"F2006B02799","name":"AD/B727/95 Amdt 2 - Outer Wing Upper Stringers","slug":"ad-b727-95-amdt-2-outer-wing-upper-stringers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42141,"registerId":"commonwealth-F2006B02799-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/95 Amdt 2 - Outer Wing Upper Stringers","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 727 Series Aeroplanes\n\n \n\n# AD/B727/95\n\nAmdt 2\n\nApplicability: All models.\n\n# Outer Wing Upper Stringers 12/88\n\n \n\nRequirement: Action in accordance with Boeing Alert SB No. 727-57A159 Rev 3 including Notice of Status Change No 727-57A159 NSC1.\n\n \n\nNote: FAA AD 88-17-06 Amdt 39-5988 refers.\n\n \n\nCompliance: As per Requirement document.\n\n \n\nBackground: Extensive cracking has been found in wing upper stringers at various rib locations.\n\nPrevious repairs may not have been effective. Revision 3 to the ASB introduced further inspection and some rework. This amendment references the latest FAA AD but does not change the requirement.\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":5,"scope_assessment":{"changed":false,"description":"The amendment explicitly states it references the latest FAA AD but does not change the requirement. The directive continues to mandate compliance with Boeing Alert Service Bulletin No. 727-57A159 Revision 3 including NSC1 for all Boeing 727 models; therefore the substantive scope of mandated inspections and rework is unchanged by this amendment. (Background; Requirement)"},"complexity_factors":["Reference to an external technical document (Boeing Alert SB No. 727-57A159 Rev 3 including NSC1) for all substantive requirements rather than containing those details in the AD itself (Requirement).","Technical nature of the mandated work (inspections and rework of wing upper stringers) requires specialist maintenance capability and judgement (Background; Requirement).","Applicability to all Boeing 727 models increases the population of affected aircraft and any variability across submodels (Applicability).","The AD refers to a related FAA AD, creating cross-jurisdictional alignment that operators must consider (Note).","The AD text does not include specific inspection intervals, procedures or mandatory repair actions within the document, leaving operators to consult the referenced SB for compliance timing and steps (Compliance; Requirement).","Presence of prior ineffective repairs increases implementation uncertainty because some aircraft may require repeat or different rework than previously done (Background)."],"plain_english_summary":"The Civil Aviation Safety Authority now requires all Boeing 727s to undergo the inspections and any rework set out in Boeing Alert Service Bulletin No. 727-57A159 Revision 3 (including NSC1), aligning with a related FAA AD. Aircraft owners and operators must obtain, pay for and carry out the SB’s inspections/repairs because of widespread wing upper‑stringer cracking and concerns some prior repairs were ineffective."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a routine amendment to an existing Airworthiness Directive. The amendment explicitly states it 'does not change the requirement' — it merely updates the reference to the corresponding FAA directive. The scope remains exactly as originally intended: mandating specific wing inspections on Boeing 727 aircraft."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 defined term implicitly referenced (the Boeing SB number)","No conditional logic or nested exceptions — simply 'do what Boeing says'","Single cross-reference to FAA AD for informational purposes only","No interpretation section or legislative definitions","Straightforward command structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft.\n\n**What it does:**\n- Orders inspections and repairs to the **outer wing upper stringers** (structural metal supports running along the top of the wings) on all **Boeing 727 series aircraft**.\n- Requires operators to follow a specific Boeing technical bulletin (Alert Service Bulletin 727-57A159 Revision 3) that details how to check for cracks and fix them.\n\n**Why it matters:**\n- **Cracks were found** in these wing components at various points where ribs connect. This is serious because wing structural failures can be catastrophic.\n- **Previous repairs may not have worked properly**, so this directive mandates updated inspection methods and rework procedures.\n- This is **Amendment 2** — it updates the Australian directive to reference the latest US Federal Aviation Administration (FAA) equivalent (AD 88-17-06), but doesn't actually change what Australian operators must do.\n\n**Who it affects:**\n- Anyone operating Boeing 727 aircraft in Australia (cargo operators, charter companies, or private owners still flying these older jets).\n- Maintenance organisations servicing these aircraft.\n\n**The bottom line:** If you fly or maintain a Boeing 727 in Australia, you must follow this specific Boeing repair manual to check your wings for cracks and fix them if found. It's a safety-critical maintenance requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-95-amdt-2-outer-wing-upper-stringers","history":"/api/acts/ad-b727-95-amdt-2-outer-wing-upper-stringers/history","analysis":"/api/acts/ad-b727-95-amdt-2-outer-wing-upper-stringers/analysis","conflicts":"/api/acts/ad-b727-95-amdt-2-outer-wing-upper-stringers/conflicts","importantCases":"/api/acts/ad-b727-95-amdt-2-outer-wing-upper-stringers/important-cases","documents":"/api/acts/ad-b727-95-amdt-2-outer-wing-upper-stringers/documents"}}