{"id":"F2006B02691","name":"AD/B727/168 - Wing Rib-to-Stringer Attachment","slug":"ad-b727-168-wing-rib-to-stringer-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42007,"registerId":"commonwealth-F2006B02691-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/B727/168 Wing Rib-to-Stringer Attachm","sectionType":"part","heading":"AD/B727/168 Wing Rib-to-Stringer Attachment 6/2000","content":"# AD/B727/168 Wing Rib-to-Stringer Attachment 6/2000\n\nApplicability: Model 727-100, \\-100C, and \\-200 series aircraft, with line numbers 1 through 1214; except those on which the modification specified by either Boeing Service Bulletin (SB) 727-57-0127 Revision 2, or SB 727-57-0127 Revision 3, has been installed.\n\nRequirement: Inspect in accordance with the technical requirements of FAA AD 2000-07-12 Amdt 39-11666.\n\nNote 1: Accomplishment of the actions required by this Directive constitutes terminating action for the inspections required by paragraph (a) of AD 94-07-08 (AD/B727/146), as specified in Boeing SB 727-57-0127 Revision 3.\n\nNote 2: Accomplishment of the structural modifications specified in either Boeing SB 727-57-0127 Revision 2 or Revision 3, constitutes terminating action for the requirements of this Directive.\n\nCompliance: As specified in the Requirement document for the initial and repetitive inspections, with a revised effective date of 15 June 2000.\n\nThis Airworthiness Directive becomes effective on 15 June 2000.\n\nBackground: The FAA received reports of incidents involving fatigue cracking and corrosion in transport category aircraft that are approaching or have exceeded their economic design goal. The actions specified by this Directive are intended to prevent degradation of the structural capabilities of the affected aircraft.\n\n![Signature of Bernard Malcolm Hole, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nBernard Malcolm Hole\n\nDelegate of the Civil Aviation Safety Authority 5 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 17 May 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This AD replaces and refines prior inspection obligations by requiring inspections per FAA AD 2000-07-12 and by excluding aircraft already modified under Boeing SB 727-57-0127 Rev 2 or Rev 3. It explicitly makes those SB modifications a terminating action for the inspections required by AD 94-07-08 (AD/B727/146). Relevant source passages: Applicability; Requirement; Note 1; Note 2."},"complexity_factors":["Cross-reference to an external mandatory document (FAA AD 2000-07-12) for technical inspection requirements, creating reliance on another authority's text (Requirement).","Applicability carve-outs that exclude airframes with specific Boeing Service Bulletin installations (Applicability; Note 2).","Terminology of 'terminating action' which alters recurring-inspection obligations when modifications are performed (Note 1; Note 2).","Repetitive inspection scheduling delegated to the referenced Requirement document rather than stated explicitly here (Compliance).","Safety rationale tied to ageing‑aircraft issues (fatigue cracking and corrosion) which can require technical judgement during inspection and repair (Background).","Regulatory enforcement and timing set by CASA delegate and an explicit effective date (5 May 2000 signature; effective 15 June 2000)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 727‑100, ‑100C and ‑200 aircraft (line numbers 1–1214) to perform inspections following the technical instructions of FAA AD 2000‑07‑12. Aircraft already modified by Boeing Service Bulletin 727‑57‑0127 Revision 2 or 3 are excluded. The directive names those SB modifications as terminating action for the recurring inspections. It matters because the inspections target fatigue cracking and corrosion; compliance work and modification costs fall to aircraft owners/operators, and CASA enforces the directive with an effective date of 15 June 2000."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific structural fatigue issue on specific Boeing 727 aircraft. It does not expand beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 4 defined/technical references (FAA AD 2000-07-12, Boeing SB 727-57-0127 Revisions 2 and 3, and previous AD 94-07-08)","Simple conditional structure: applicability defined by aircraft model and line number, with straightforward exception","Cross-references to external technical documents (FAA AD and Boeing Service Bulletin) rather than internal legislative complexity","Clear compliance timeline and terminating actions","No nested exceptions or recursive definitions"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires inspections of wing rib-to-stringer areas on Boeing 727-100/100C/200 series (line numbers 1–1214) to detect fatigue cracking and corrosion, following FAA AD 2000-07-12. Effective 15 June 2000, inspections are repetitive until terminated by completing the Directive’s actions or installing Boeing Service Bulletin 727-57-0127 Rev 2 or 3. It addresses age-related structural deterioration to prevent catastrophic failures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-168-wing-rib-to-stringer-attachment","history":"/api/acts/ad-b727-168-wing-rib-to-stringer-attachment/history","analysis":"/api/acts/ad-b727-168-wing-rib-to-stringer-attachment/analysis","conflicts":"/api/acts/ad-b727-168-wing-rib-to-stringer-attachment/conflicts","importantCases":"/api/acts/ad-b727-168-wing-rib-to-stringer-attachment/important-cases","documents":"/api/acts/ad-b727-168-wing-rib-to-stringer-attachment/documents"}}