{"id":"F2006B03170","name":"AD/B747/274 Amdt 1 - Body Station 1480 Bulkhead Splice","slug":"ad-b747-274-amdt-1-body-station-1480-bulkhead-splice","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42542,"registerId":"commonwealth-F2006B03170-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/274 Amdt 1 - Body Station 1480 Bulkhead Splice","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS 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 revokes Airworthiness Directive (AD) AD/B747/274 and issues the following 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\n\nAD/B747/274\n\nAmdt 1\n\n  \nBody Station 1480 Bulkhead Splice 3/2003\n\nApplicability: Model 747 series aircraft, line numbers 1 through 750, excluding aircraft on which the bulkhead splice areas have been modified in accordance with Plan “B” of FAA AD 2001-11-06 (AD/B747/256).\n\nRequirement: Inspect in accordance with the technical requirements of FAA AD 2002-26-17 Amdt 39-13005.\n\nNote: Boeing Alert Service Bulletin 747-53A2477 refers.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 20 March 2003.\n\nThis Amendment becomes effective on 20 March 2003.\n\nBackground: The FAA requires a one-time inspection to identify all alloy steel bolts on the station 1480 bulkhead splice, and detect and correct cracked or broken bolts, which could result in structural damage and rapid decompression of the aircraft.\n\nAmendment 1 is issued in response to a new FAA AD which requires accomplishment of the previously optional terminating action.\n\nThe original issue of this Airworthiness Directive became effective on 11 July 2002.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 6 February 2003\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 26 February 2003.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 makes the previously optional terminating action mandatory (Background: \"requires accomplishment of the previously optional terminating action\") and updates the compliance effective date to 20 March 2003 (Compliance). The AD thus expands mandatory obligations on affected operators compared with the original AD."},"complexity_factors":["Cross-references external FAA AD 2002-26-17 for technical procedures, requiring implementers to follow another instrument","Relies on Boeing Alert Service Bulletin for further technical detail (Note)","Applicability carve-outs (line numbers 1–750, exclusion for Plan “B” modifications) require operator record checks","Mandates inspection plus potential corrective action, creating operational and cost burden on operators","Amendment changes a previously optional terminating action to mandatory, altering compliance obligations","Compliance timing and revised effective date introduce a narrow implementation window"],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 747s (line numbers 1–750, except aircraft modified per Plan “B” of AD/B747/256) to inspect the station 1480 bulkhead splice for alloy steel bolts and to repair or replace any cracked or broken bolts, following the technical requirements of FAA AD 2002-26-17 and Boeing service instructions. The work (inspection and any corrective action) must be done by aircraft operators and is intended to prevent structural damage and rapid decompression. (Applicability; Requirement; Background; Compliance.)"},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope — inspecting bolts at Body Station 1480 on early Boeing 747s. The only change is making mandatory what was previously optional (the terminating action), which is a tightening of requirements within the same safety purpose rather than an expansion of scope."},"complexity_factors":["Single, specific technical requirement (inspect bolts at one location)","Only 4 defined applicability criteria (model series, line numbers, exclusion)","No nested conditional logic or cross-references to other legislation","Refers to external technical document (FAA AD 2002-26-17) for detailed instructions rather than embedding them","Straightforward compliance timeline (single effective date)","Total length: approximately 300 words"],"plain_english_summary":"This safety order requires owners/operators of Boeing 747s (s/n 1–750), except those already modified under FAA AD 2001-11-06, to perform a one-time inspection of metal bolts at Body Station 1480 (bulkhead splice) and repair or replace any cracked or broken bolts. It revokes and replaces the prior order and now makes the previously optional permanent repair mandatory to prevent structural failure and rapid decompression."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-274-amdt-1-body-station-1480-bulkhead-splice","history":"/api/acts/ad-b747-274-amdt-1-body-station-1480-bulkhead-splice/history","analysis":"/api/acts/ad-b747-274-amdt-1-body-station-1480-bulkhead-splice/analysis","conflicts":"/api/acts/ad-b747-274-amdt-1-body-station-1480-bulkhead-splice/conflicts","importantCases":"/api/acts/ad-b747-274-amdt-1-body-station-1480-bulkhead-splice/important-cases","documents":"/api/acts/ad-b747-274-amdt-1-body-station-1480-bulkhead-splice/documents"}}