{"id":"F2006B10962","name":"AD/JETSTREAM/93 Amdt 1 - Vertical Stabiliser Attachment Fittings","slug":"ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56531,"registerId":"commonwealth-F2006B10962-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/93 Amdt 1 - Vertical Stabiliser Attachment Fittings","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety 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/JETSTREAM/93 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\nBritish Aerospace BAE 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/93\n\nAmdt 1\n\n  \nVertical Stabiliser Attachment Fittings 4/2003\n\nApplicability: All Model 3100 and 3200 Series aircraft.\n\nRequirement: Inspect in accordance with BAE Systems Mandatory Service Bulletin 55-JA020543.\n\nNote: UK CAA AD 004-10-2002 refers.\n\nCompliance: Carry out the initial inspection within 2 years after 17 April 2003. If Part 2 of the original Requirement document (SB 55-JA010941) was complied with, then the initial inspection requirements have been satisfied. If operators have removed the horizontal stabiliser and have carried out detailed visual inspections of the attachment fitting lugs, then the initial inspection requirements have been satisfied.\n\nAccomplish repeat inspections after accomplishment of the initial inspection, at intervals not to exceed 8 years or 4,000 flight hours, whichever occurs first.\n\nThis Amendment becomes effective on 17 April 2003.\n\nBackground: Fretting corrosion was found during inspection of the horizontal and vertical stabiliser attachment bolts on in-service aircraft. The corrosion was found on the horizontal stabiliser attachment fitting lugs (forward and rear) and the vertical stabiliser attachment fitting lugs (rear).\n\nAmendment 1 is issued in response to a new Requirement document, which introduces improved access, and, as a result, no credit can be taken for inspections carried out to the Maintenance Schedule or Service Bulletin 55-JA010941 Part 1. The corrosion treatment is moved into separate Service Bulletin 55-JA020544.\n\nThe original issue of this Airworthiness Directive became effective on 8 August 2002.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.jpeg)  \n\nDavid Alan Villiers\n\n![](image.001.png)Delegate of the Civil Aviation Safety Authority 5 March 2003\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 26 March 2003.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 alters compliance mechanics but does not broaden the AD’s substantive scope. The AD still targets the same aircraft types (BAE 3100/3200) and the same unsafe condition (fretting corrosion on stabiliser attachment lugs). The amendment removes credit for earlier, less-accessible inspections (Part 1 of SB 55-JA010941), introduces a new inspection procedure (SB 55-JA020543) with improved access, and separates corrosion treatment into SB 55-JA020544. Those changes adjust how operators comply and may increase work for some operators, but they do not expand the AD’s subject matter beyond the original safety purpose."},"complexity_factors":["Short document (single-page AD) with limited provisions","Primary obligations are a single inspection requirement and a repeat-interval requirement","Two external cross-references to manufacturer Service Bulletins (55-JA020543 and 55-JA020544)","One conditional credit clause referencing compliance with older Service Bulletin 55-JA010941 Part 2 or removal of horizontal stabiliser","One additional cross-reference to a related UK CAA AD"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Applies to: all British Aerospace BAE 3100 and 3200 (Jetstream) series aircraft. (Applicability)\n- Requires: operators to inspect the vertical stabiliser attachment fittings in accordance with BAE Systems Mandatory Service Bulletin 55-JA020543. (Requirement)\n- Timing:\n  - Initial inspection must be completed within 2 years after 17 April 2003. (Compliance)\n  - Repeat inspections are required at intervals not to exceed 8 years or 4,000 flight hours, whichever comes first. (Compliance)\n- Credits/exemptions: if an operator already complied with Part 2 of the older Service Bulletin 55-JA010941, or removed the horizontal stabiliser and performed detailed visual inspections of the attachment fitting lugs, the initial inspection requirement is treated as satisfied. (Compliance)\n- Amendment detail: this Amendment 1 replaces the original AD because the new Service Bulletin gives improved physical access; as a result, inspections done to Part 1 of the older SB 55-JA010941 can no longer be credited. Corrosion repair/treatment work is placed in a separate Service Bulletin (55-JA020544). (Background / Amendment 1)\n- Legal basis and effect: the Civil Aviation Safety Authority delegate issued the AD under the aircraft safety regulations, so compliance is mandatory for continued airworthiness certification. (Prefatory material)\n\nWhy the AD exists (claimed purpose) and how that maps to costs and behaviour\n\n- Claimed purpose: inspections are required because in-service inspections found fretting corrosion on the attachment lugs for the horizontal and vertical stabilisers. The AD’s stated aim is to detect and address that corrosion to maintain structural integrity. (Background)\n\n- Who decides and who pays:\n  - Decision maker: CASA (delegate) issued the AD and sets the inspection requirement and interval. (Prefatory material / Requirement)\n  - Who pays: aircraft operators or their maintenance organisations pay for the inspections, any subsequent repairs, and associated aircraft downtime. Maintenance organisations will execute the inspections under the Service Bulletin instructions. (Requirement / Compliance)\n\n- Behaviour changes required of operators:\n  - Schedule and perform the initial inspection per SB 55-JA020543 within the stated timeframe.\n  - If corrosion or damage is found, follow the service instructions (and the separate SB for corrosion treatment if applicable).\n  - Continue to perform repeat inspections every 8 years or 4,000 flight hours.\n\nTrade-offs, implementation risks and incentives\n\n- Direct costs and burden: the AD imposes a measurable inspection and possible repair cost on every operator of the affected types, plus aircraft downtime while MROs perform access, inspection and repairs. The inspection interval (up to 8 years / 4,000 hours) spreads that cost but does not eliminate it.\n\n- Change in compliance credit: Amendment 1 withdraws credit for earlier, Part 1 inspections under SB 55-JA010941 because the new SB provides improved access. That increases workload for operators who relied on Part 1 compliance as satisfying the AD, since they now must redo inspections under the new SB to get credit. (Amendment 1)\n\n- Risk management vs cost: the interval is relatively long; that reduces ongoing cost but increases the period during which corrosion could develop between inspections. The AD relies on the service bulletin’s inspection method and access improvements to mitigate the risk of missed corrosion during earlier inspections.\n\n- Allocation of repair responsibility: corrosion treatment is moved to a separate SB (55-JA020544). Splitting inspection and repair into two SBs clarifies the tasks but may require operators to reference and pay for multiple documents/works orders.\n\n- Market effects: the AD generates work for maintenance organisations qualified to perform the inspections and repairs. It does not change aircraft ownership, operational rules, or market entry; it primarily affects routine maintenance schedules and costs.\n\nCross-references and enforcement\n\n- The AD cross-references BAE service bulletins (55-JA020543 for inspection; 55-JA020544 for corrosion treatment) and cites a related UK CAA AD (004-10-2002). Operators must follow the specified SB instructions to comply. Non‑compliance would affect an aircraft’s airworthiness status under the Civil Aviation Safety Regulations.\n\nBottom line (concise): This AD mandates periodic inspection of the vertical stabiliser attachment fittings on all Jetstream 3100/3200 aircraft per BAE Service Bulletin 55-JA020543, with an initial deadline (within 2 years of 17 April 2003) and repeat intervals every 8 years or 4,000 flight hours. Amendment 1 tightens inspection credit (removing credit for older Part 1 inspections), moves corrosion repair to a separate bulletin, and is intended to improve detection through better access. Operators bear inspection and repair costs and must update maintenance schedules to comply."},"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 amendment remains tightly focused on its original purpose: addressing corrosion in vertical stabiliser attachment fittings on Jetstream 3100/3200 aircraft. While it updates the technical requirements (new service bulletin, revised inspection intervals, changed credit rules for prior work), it does not expand beyond the original aircraft models or the specific safety issue of attachment fitting corrosion."},"complexity_factors":["Multiple cross-references to external documents (UK CAA AD 004-10-2002, BAE Systems Service Bulletins 55-JA020543, 55-JA010941, and 55-JA020544)","Conditional compliance logic with three separate exemption pathways (Part 2 compliance, horizontal stabiliser removal with detailed visual inspection, and the new standard inspection)","Dual metric for repeat inspections (time-based 8 years vs. flight hours-based 4,000 hours, whichever occurs first)","Nested effective dates (original AD effective 8 August 2002, amendment effective 17 April 2003, compliance deadline calculated from amendment effective date)","Technical aviation terminology requiring domain knowledge (fretting corrosion, attachment fitting lugs, horizontal/vertical stabiliser)"],"plain_english_summary":"This safety order replaces an older one and mandates inspections of the bolts and fittings that secure the vertical tail on British Aerospace Jetstream 3100/3200 aircraft after corrosion was found. Operators must perform the specified initial and recurring inspections (initial by April 2005, then every 8 years or 4,000 flight hours) because failure of these fittings could compromise control of the aircraft. Certain operators who already completed the updated, more detailed inspection steps are exempt from repeating the initial check."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings","history":"/api/acts/ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings/history","analysis":"/api/acts/ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings/analysis","conflicts":"/api/acts/ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings/conflicts","importantCases":"/api/acts/ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings/important-cases","documents":"/api/acts/ad-jetstream-93-amdt-1-vertical-stabiliser-attachment-fittings/documents"}}