{"id":"F2006B03183","name":"AD/B747/289 - Fuselage Skin between BS 1961 and BS 2360","slug":"ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42555,"registerId":"commonwealth-F2006B03183-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.001.png)\n\n![](image.001.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.\n\nBoeing 747 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B747/289 Fuselage Skin between BS 196","sectionType":"part","heading":"AD/B747/289 Fuselage Skin between BS 1961 and BS 2360 4/2003","content":"# AD/B747/289 Fuselage Skin between BS 1961 and BS 2360 4/2003\n\nApplicability: All Model 747 series aircraft.\n\nRequirement: Inspect in accordance with the technical requirements of FAA AD 2003-03-19 Amdt 39-13044.\n\nNote: Boeing Alert Service Bulletin 747-53A2489 refers.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 17 April 2003.\n\nThis Airworthiness Directive becomes effective on 17 April 2003.\n\nBackground: This Directive requires a one-time inspection of the fuselage skin of the aft lower body for certain repair doublers, and follow-on inspections and corrective actions if such doublers are installed. The actions required by this Directive are intended to detect and correct possible fatigue cracking of the fuselage skin concealed under certain repair doublers, which could result in rapid decompression of the aircraft.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 6 March 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — a targeted safety inspection for a specific structural issue on a specific aircraft type. It does not expand beyond its original purpose of addressing fatigue cracking under repair doublers on Boeing 747 fuselage skins."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly used ('BS' for Body Station, though not explicitly defined)","Single requirement that references an external technical document (FAA AD 2003-03-19) rather than spelling out detailed instructions","No nested exceptions or conditional logic — straightforward applicability (all 747s) and single compliance pathway","Minimal cross-referencing: only to the FAA AD and a Boeing service bulletin"],"plain_english_summary":"This AD requires a one‑time inspection of the lower rear fuselage (between BS 1961 and BS 2360) on all Boeing 747s for repair doublers, with mandatory follow‑up inspections/repairs if doublers are present. It addresses hidden fatigue cracking beneath patches that could lead to rapid decompression, applies to owners/operators and maintenance personnel, and aligns CASA action with the FAA directive (effective 17 April 2003)."},"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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"Scope remains directed at all Boeing 747 series aircraft and requires the inspections and corrective actions described in FAA AD 2003-03-19. The instrument simply sets the effective date (revised to 17 April 2003) and adopts the FAA technical requirements; it does not expand or narrow the class of affected aircraft or the basic inspection/corrective regime described in the requirement."},"complexity_factors":["Cross-reference to an external instrument: Requirement is to inspect “in accordance with the technical requirements of FAA AD 2003-03-19,” creating dependency on another regulator’s document.","Reference to manufacturer guidance: Note indicates Boeing Alert Service Bulletin 747-53A2489 is relevant, adding another external technical source.","Safety‑critical, technical inspections: Detecting concealed fatigue cracking under repair doublers requires structural access, specialised inspection techniques and judgement.","Follow-on actions: The AD mandates not just one inspection but potential follow-on inspections and corrective actions, expanding operational and maintenance burden contingent on findings.","Wide applicability: Applies to all Model 747 series aircraft, increasing the universe of affected operators and potential cumulative compliance costs.","Timing and regulatory formality: Compliance tied to timings in the referenced FAA AD and a revised effective date (17 April 2003), requiring operators to track external dates and amendments.","Delegated decision-making: Issued under subregulation 39.1(1) of CAR 1998 (delegate’s authority), reflecting administrative discretion in the AD issuance and wording."],"plain_english_summary":"This Airworthiness Directive requires operators of all Boeing 747 series aircraft to carry out a one-time inspection of the aft lower fuselage skin (and follow-on inspections/repairs if certain repair doublers are found) using the technical procedures in FAA AD 2003-03-19. It targets concealed fatigue cracking under specific repair doublers that could lead to rapid decompression. The directive binds operators to the FAA-prescribed inspection and corrective steps, with a revised effective date of 17 April 2003."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360","history":"/api/acts/ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360/history","analysis":"/api/acts/ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360/analysis","conflicts":"/api/acts/ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360/conflicts","importantCases":"/api/acts/ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360/important-cases","documents":"/api/acts/ad-b747-289-fuselage-skin-between-bs-1961-and-bs-2360/documents"}}