{"id":"F2005L00096","name":"AD/B767/4 Amdt 1 - Horizontal Stabiliser Pivot Fitting - Outer Pivot Pin Inspection and Inner Pin Replacement","slug":"ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":33477,"registerId":"commonwealth-F2005L00096-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/4 Amdt 1 | Horizontal Stabiliser Pivot Fitting - Outer Pivot Pin Inspection and Inner Pin Replacement | 2/2005 |\n| ---------------- | ------------------------------------------------------------------------------------------ | ------ |\n\n| Applicability: | Applicable to all aircraft listed by customer code and variable number in the requirement document.                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Boeing S.B. No. 767-55-0005 Rev 01 or latter FAA approved revision.Note: FAA AD 85-09-02, Amdt 39-5057 refers.                                                                                                                                                                                                                                                      |\n| Compliance:    | As detailed in the requirement document.                                                                                                                                                                                                                                                                                                                            |\n|                | This Amendment becomes effective on 17 February 2005.                                                                                                                                                                                                                                                                                                               |\n| Background:    | The failure of a pivot fitting pin on the B767 major fatigue test article was attributed to improper manufacture. This directive is prompted by the discovery that a number of these parts were improperly manufactured.This amendment is issued to update the requirement document revision status.The original issue of this AD became effective on 31 July 1985. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n14 December 2004\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 26 January 2005.","sortOrder":0},{"sectionNumber":"AD/B767/4 Amdt 1","sectionType":"part","heading":"AD/B767/4 Amdt 1","content":"## AD/B767/4 Amdt 1","sortOrder":1},{"sectionNumber":"Horizontal Stabiliser Pivot Fitting - Ou","sectionType":"part","heading":"Horizontal Stabiliser Pivot Fitting - Outer Pivot Pin Inspection and Inner Pin Replacement","content":"## Horizontal Stabiliser Pivot Fitting - Outer Pivot Pin Inspection and Inner Pin Replacement","sortOrder":2},{"sectionNumber":"2/2005","sectionType":"part","heading":"2/2005","content":"## 2/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment updates the required revision of the Boeing service bulletin cited by the original AD; it does not expand the technical scope of the directive beyond the original intent to inspect outer pivot pins and replace inner pins where required due to improper manufacture. The AD therefore maintains the original scope (addressing suspect pivot fitting pins) and primarily changes the document/revision reference used for compliance."},"complexity_factors":["Short, single‑issue AD focused on one component (horizontal stabiliser pivot fitting pins)","Primary action is to follow an external Boeing Service Bulletin (No. 767-55-0005 Rev 01) rather than containing detailed technical steps in the AD itself","Cross‑reference to FAA AD (85-09-02, Amdt 39-5057) and allowance for later FAA‑approved revisions creates a dependency on external documents","Ambiguous applicability phrase: 'all aircraft listed by customer code and variable number in the requirement document' (requires checking the referenced document to determine exact affected serials)","Few internal conditions, exceptions, or nested provisions — largely a straight reference and update of the required service bulletin revision"],"plain_english_summary":"**What this safety directive does**\n\n- Requires operators of the affected Boeing 767 aeroplanes to inspect the horizontal stabiliser outer pivot pin and to replace the inner pivot pin, following the procedures and times specified in Boeing Service Bulletin No. 767-55-0005 Revision 01 (or a later FAA‑approved revision). (See the \"Requirement\" paragraph.)\n\n- Makes compliance mandatory by reference to that service bulletin; the AD takes effect for Australian operators on 17 February 2005. (See the \"Compliance\" and \"This Amendment becomes effective\" lines.)\n\n**Who is affected**\n\n- Aircraft owners and operators of the Boeing 767 variants listed by customer code and variable number in the referenced requirement document. Maintenance organisations that carry out structural inspections and pin replacements will also be involved.\n\n**Why it matters (stated purpose and mechanical effect)**\n\n- The AD was issued after a pivot fitting pin failed during a major fatigue test. The failure was attributed to improper manufacture, and some parts were discovered to have been improperly manufactured. The stated purpose of the AD is to ensure those suspect parts are identified and corrected to reduce the risk of pivot fitting failure. (See the \"Background\" paragraph.)\n\n**How the rule works in practice**\n\n- The AD does not itself give step‑by‑step instructions; it requires operators to follow Boeing Service Bulletin 767-55-0005 Rev 01 (or any later FAA‑approved revision). That service bulletin will specify inspection methods, inspection intervals, acceptance criteria, and replacement procedures. (See the \"Requirement\" paragraph.)\n\n- If inspection finds an out‑of‑tolerance or defective outer pivot pin, or if the service bulletin mandates replacement of the inner pin, the operator must carry out the replacement/repairs as specified.\n\n**Who pays and who decides**\n\n- Aircraft owners/operators pay for inspections, parts and downtime required to comply. Certified maintenance organisations or authorised personnel perform and certify the work.\n\n- The Civil Aviation Safety Authority (through the AD) requires compliance; the detailed procedures and any later technical revisions are set by the Boeing service bulletin and any FAA‑approved revisions referenced by the AD. (See \"Requirement\" and the FAA AD note.)\n\n**Trade‑offs, costs, and implementation considerations**\n\n- Direct costs: labour for inspections, cost of replacement inner pins if required, aircraft out‑of‑service time, and recordkeeping. These costs are borne by the operator.\n\n- Operational impacts: aircraft may be grounded temporarily to complete inspections and replacements, depending on the intervals and findings the service bulletin prescribes.\n\n- Supply/implementation risk: if replacement pins or approved repair parts are in short supply, compliance could take longer and increase downtime.\n\n- Regulatory updating: the AD expressly allows later FAA‑approved revisions of the Boeing service bulletin to be followed; that creates an administrative dependency on the bulletin and FAA approval process (the AD here updates the required document revision status). (See the \"Requirement\" and \"Background\" paragraphs.)\n\n**Net effect**\n\n- Operators must follow the referenced service bulletin to inspect and, where required, replace pivot pins on the horizontal stabiliser pivot fitting. The AD aims to address a manufacturing defect discovered during fatigue testing by identifying and replacing suspect parts; it imposes inspection and replacement obligations and associated costs on operators.\n"},"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":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original 1985 scope precisely. It does not expand the aircraft covered, the nature of the inspection/replacement required, or the safety objective. The amendment solely updates the reference to the Boeing service bulletin revision status, ensuring operators use current technical instructions rather than obsolete versions."},"complexity_factors":["Very short document (under 300 words)","Only 1 substantive requirement referencing external technical document (Boeing Service Bulletin)","No defined terms section — relies entirely on external aviation technical standards","Simple conditional structure: applicability → requirement → compliance date","Single amendment purpose (updating document revision reference)","Heavy reliance on external technical documentation (Boeing S.B. No. 767-55-0005) for actual implementation details"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. It applies to **Boeing 767 aeroplanes** and requires specific maintenance work on the **horizontal stabiliser** (the small wing at the tail that helps control the plane's pitch).\n\n**What it does:**\n- **Inspects the outer pivot pin** — checking a critical connection point where the stabiliser attaches to the fuselage\n- **Replaces the inner pin** — swapping out an internal component that was found to have manufacturing defects\n\n**Why it matters:**\nDuring fatigue testing (simulating years of flight stress), one of these pins failed because it wasn't made properly. The discovery revealed that multiple aircraft had similarly defective parts installed. A failed pivot pin could potentially cause loss of control of the aircraft's tail section.\n\n**Who must comply:**\nAll Boeing 767 operators in Australia must follow the specific Boeing service bulletin referenced, or any later FAA-approved version. The exact aircraft affected are listed in Boeing's technical documentation by customer code and variable number.\n\n**Key point:** This is actually an **amendment** updating a 1985 directive — it simply refreshes which version of the technical instructions applies, ensuring operators use the most current safety procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac","history":"/api/acts/ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac/history","analysis":"/api/acts/ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac/analysis","conflicts":"/api/acts/ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac/conflicts","importantCases":"/api/acts/ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac/important-cases","documents":"/api/acts/ad-b767-4-amdt-1-horizontal-stabiliser-pivot-fitting-outer-pivot-pin-inspection-and-inner-pin-replac/documents"}}