{"id":"F2006B10888","name":"AD/JETSTREAM/20 Amdt 1 - NLG Retraction Jack Attachment Bracket and Bolts","slug":"ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56418,"registerId":"commonwealth-F2006B10888-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/20 Amdt 1 - NLG Retraction Jack Attachment Bracket and Bolts","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)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/20\n\nAmdt 1\n\n  \n\nNLG Retraction Jack Attachment Bracket and Bolts\n\n  \n3/95\n\nApplicability: All HP137 Mk1 and Jetstream Series 200 aircraft with Modification 5127 embodied, and Jetstream Series 3100 and Series 3200 with constructors numbers 601 through 840.\n\nRequirement: Action in accordance with BAe Mandatory ASB 53-A-JA 870510.\n\nNote: Compliance with BAe SB 53-JM 5285 constitutes terminating action for the requirement of this directive.\n\nCompliance: As specified in the requirement document with landings to count from previous certified compliance; until compliance with BAe SB 53-JM 5285. This Amendment is effective from 2 March 1995.\n\nBackground: Reports were received of in-service failures of the bolts securing the nose gear retraction jack attachment bracket. Amendment 1 is issued to align this Directive with the manufacturer’s optional terminating action.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose: addressing nose gear bolt failures on specific Jetstream aircraft. Amendment 1 simply adds an optional terminating action (BAe SB 53-JM 5285) to reduce ongoing compliance burden, without expanding the aircraft types covered or the nature of the safety issue."},"complexity_factors":["Single, specific mechanical issue (bolt failures on one component)","Limited applicability — only 4 specific aircraft variants with narrow serial number ranges","Clear compliance path: follow manufacturer service bulletin or optional terminating action","No nested exceptions or conditional logic — straightforward 'do this or do that' structure","Short document (under 300 words) with minimal defined terms","Single cross-reference to manufacturer documents (ASB and SB)"],"plain_english_summary":"This is an **Airworthiness Directive** — a legally binding safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners and operators to fix a specific mechanical problem.\n\n**What it does:**\n- Orders inspection and repair of bolts on the **nose landing gear retraction jack attachment bracket** on certain British Aerospace Jetstream aircraft.\n- These bolts were failing in service, which could affect the aircraft's ability to retract or extend its nose wheel — a serious safety issue.\n\n**Who it affects:**\n- Owners and operators of specific Jetstream models: HP137 Mk1, Series 200 (with Modification 5127), and Series 3100/3200 (construction numbers 601–840).\n\n**What must be done:**\n- Follow the manufacturer's mandatory service bulletin (BAe Mandatory ASB 53-A-JA 870510) to inspect and fix the bolts.\n- **Good news:** There's an optional \"terminating action\" — if you comply with a different service bulletin (BAe SB 53-JM 5285), you can permanently satisfy this requirement and stop doing the repeated inspections.\n\n**Why it matters:**\nLanding gear failures can be catastrophic. This directive prevents accidents by forcing operators to address a known defect. The amendment makes compliance easier by allowing a one-time fix instead of ongoing inspections."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 modifies AD/JETSTREAM/20 to align the Directive with the manufacturer’s optional terminating action (BAe SB 53-JM 5285). Mechanically, the AD now explicitly accepts the SB as terminating action and retains compliance measured in landings from prior certified compliance; it therefore changes the AD’s end condition rather than adding new mandatory work beyond the referenced ASB."},"complexity_factors":["Cross-reference to external manufacturer documents (BAe Mandatory ASB 53-A-JA 870510) — operators must obtain and follow that document to comply.","Optional terminating action (BAe SB 53-JM 5285) changes when the directive stops applying — creates a conditional end-state.","Applicability is specific by model, modification (Mod 5127) and constructors' number range (601–840) — requires aircraft-by-aircraft applicability checks.","Compliance counting uses prior certified compliance landings — recordkeeping and verification burden for operators.","Amendment aligns the Directive with manufacturer action rather than prescribing alternative measures — limits regulator-specified detail but increases dependence on manufacturer material."],"plain_english_summary":"This airworthiness directive orders operators of specified British Aerospace Jetstream types to carry out the maintenance actions set out in BAe Mandatory ASB 53-A-JA 870510 to address failures of the nose‑gear retraction jack attachment bracket bolts. It applies to HP137 Mk1 and Jetstream Series 200 aircraft with Modification 5127, and Jetstream Series 3100/3200 with constructor numbers 601–840.\n\nCompliance is measured in landings from prior certified compliance and is ended if the optional terminating action in BAe SB 53-JM 5285 is embodied."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts","history":"/api/acts/ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts/history","analysis":"/api/acts/ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts/analysis","conflicts":"/api/acts/ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts/conflicts","importantCases":"/api/acts/ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts/important-cases","documents":"/api/acts/ad-jetstream-20-amdt-1-nlg-retraction-jack-attachment-bracket-and-bolts/documents"}}