{"id":"F2006B03082","name":"AD/B747/180 Amdt 1 - Longeron Splice Fittings at Stringer 11, BS 2598","slug":"ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42441,"registerId":"commonwealth-F2006B03082-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/180 Amdt 1 - Longeron Splice Fittings at Stringer 11, BS 2598","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![](image.002.png)  \nBoeing 747 Series Aeroplanes\n\nAIRWORTHINESS 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 revokes Airworthiness Directive (AD) AD/B747/180 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\nAD/B747/180\n\nAmdt 1\n\n  \nLongeron Splice Fittings at Stringer 11, BS 2598 9/2000\n\nApplicability: Model 747-100, 747-200, 747-300, 747SR, and 747SP series aircraft with line positions 201 through 886.\n\nRequirement: Perform a detailed visual inspection to detect cracking of the longeron fittings at stringer 11, on the left and right sides at body station (BS) 2598, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin (ASB) 747- 53A2410, Revision 2, including Addendum, or ASB 747-53A2410 Revision 3, including Addendum. After the effective date of this Directive, only ASB 747- 53A2410 Revision 3 shall be used.\n\nNote: FAA AD 2000-10-23 Amdt 39-11748 refers.\n\nCompliance: As specified in the Requirement document for the initial and repetitive inspection requirements, with a revised effective date of 7 September 2000.\n\nThis Amendment becomes effective on 7 September 2000.\n\nBackground: The FAA received reports of fatigue cracking of the longeron splice fittings at BS 2598 on Model 747SR and 747-200 series aircraft. The most recent cracking was detected on an aircraft that had accumulated 62,783 total flight hours and 16,867 total flight cycles. Such fatigue cracking, if not detected and corrected, could result in reduced controllability of the horizontal stabiliser.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nAmendment 1 is issued in response to a new FAA AD which reduces the compliance time for accomplishment of the currently required inspection and adds a new requirement for repetitive inspections. This action was prompted by reports of fatigue cracking found on longeron splice fittings.\n\nThe original issue of this Airworthiness Directive became effective on 26 March 1998.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 27 July 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 9 August 2000.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of the March 1998 directive. It tightens compliance times and adds repetitive inspection requirements based on new safety data, but does not expand to new aircraft models or different structural areas. The core purpose — inspecting longeron splice fittings at BS 2598 — remains unchanged."},"complexity_factors":["Technical aviation terminology requires specialised knowledge (longeron splice fittings, stringer 11, body station 2598, line positions)","References to external technical documents (Boeing Alert Service Bulletin 747-53A2410 Revisions 2 and 3) without reproducing their contents","Cross-reference to FAA AD 2000-10-23 Amdt 39-11748 for additional context","Specific aircraft model and production range limitations (line positions 201-886)","Conditional compliance timing (initial vs repetitive inspections with different effective dates)","Version control complexity (Revision 2 acceptable initially, Revision 3 mandatory after effective date)"],"plain_english_summary":"This FAA Airworthiness Directive requires owners/operators of certain older Boeing 747s (‑100/‑200/‑300/‑SR/‑SP, line positions 201–886) to inspect longeron splice fittings at stringer 11, body station 2598 for fatigue cracking, follow Boeing Alert Service Bulletin 747‑53A2410 (now limited to Revision 3), and perform repetitive inspections as specified. Prompt, repeated checks are required because cracking found at ~63,000 flight hours can impair horizontal stabilizer control. Effective 7 September 2000."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 narrows the allowed time to comply and adds recurring inspection requirements compared with the original AD; it also mandates use of ASB 747-53A2410 Revision 3 after the effective date and updates the effective compliance date to 7 September 2000 (Amendment/Requirement/Compliance/Background). Applicability to the same models and line positions remains unchanged."},"complexity_factors":["Reference to and mandatory use of a specific Boeing Alert Service Bulletin and its revisions (Requirement)","Change in compliance timing and addition of repetitive inspections — affects scheduling and maintenance planning (Compliance; Amendment 1)","Applicability limited to particular 747 models and line positions (Applicability) — requires operators to check fleet records","Technical nature of the defect (fatigue cracking at a specific body station) requires trained inspection personnel and possible follow-up repairs (Background; Requirement)","Cross-reference to FAA AD increases regulatory cross-jurisdictional alignment and tracking (Note/Background)","Effective date and revision rule (only Revision 3 after effective date) introduce a cut‑off for acceptable procedures (Requirement; Compliance)"],"plain_english_summary":"This amendment requires operators of specified Boeing 747-100/200/300/SR/SP aircraft (line positions 201–886) to carry out a detailed visual inspection for cracking of the longeron splice fittings at stringer 11, body station 2598, following Boeing Alert Service Bulletin `ASB 747-53A2410` and, after the effective date, using Revision 3 only. It shortens the previously allowed compliance time and adds mandatory repetitive inspections to detect fatigue cracking that could reduce horizontal stabiliser controllability. Operators must follow CASA’s timing and instructions and will bear inspection and repair costs (Requirement; Compliance; Background)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598","history":"/api/acts/ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598/history","analysis":"/api/acts/ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598/analysis","conflicts":"/api/acts/ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598/conflicts","importantCases":"/api/acts/ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598/important-cases","documents":"/api/acts/ad-b747-180-amdt-1-longeron-splice-fittings-at-stringer-11-bs-2598/documents"}}