{"id":"F2006B10949","name":"AD/JETSTREAM/79 - Main Landing Gear Brake Unit","slug":"ad-jetstream-79-main-landing-gear-brake-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56516,"registerId":"commonwealth-F2006B10949-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/79 - Main Landing Gear Brake Unit","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/79 Main Landing Gear Brake Unit 10/98 DM\n\nApplicability: Jetstream Series 3100 and 3200 aircraft as detailed in the requirement document. Requirement: Action in accordance with British Aerospace Regional Aircraft Alert Service Bulletin\n\n32-A-JA980540.\n\nNote: UK CAA AD 003-07-98 refers.\n\nCompliance: Unless already accomplished, action in accordance with Part 1 and Part 2 of the Requirement document before 31 July 1998.\n\nThis airworthiness directive becomes effective on 22 July 1998.\n\nBackground: An incident has occurred where a brake unit heat pack was found to be totally worn when the indicator pins showed 0.1 inches of wear remaining. This directive requires a check of the wear remaining length indicated by the wear indicator pins and inspection to determine that the indicator pins are set correctly. There is a possibility that a fully worn heat pack in a brake unit may not be indicated as such by the indicator pins if not set correctly, which is a potentially unsafe condition.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating brake inspections for the identified aircraft series."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability criteria (aircraft series)","Single compliance requirement referencing an external technical document (British Aerospace Alert Service Bulletin)","No nested exceptions or conditional logic — straightforward 'do this by this date' structure","Background explanation is narrative and accessible, not technical legalese"],"plain_english_summary":"CASA issued a mandatory Airworthiness Directive for British Aerospace Jetstream 3100/3200 aircraft requiring inspection of main-gear brake wear indicator pins (and correct installation) per the manufacturer’s service bulletin, to be done before 31 July 1998 unless already completed. It affects Australian operators and prevents dangerously worn brakes being masked by faulty indicators, reducing risk of brake failure on landing or rejected takeoffs."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD keeps scope focused on verifying and correcting brake heat‑pack wear indication for Jetstream 3100/3200 aircraft. It does not expand applicability beyond those types or add unrelated requirements; it delegates specific procedures to the named British Aerospace Alert Service Bulletin. Responsibility rests with aircraft operators to perform inspections and corrective work within the stated timeframe under CASA's directive."},"complexity_factors":["Narrow applicability: limited to BAe Jetstream Series 3100 and 3200 (targets a small operator population).","Dependence on external Requirement document (British Aerospace Alert Service Bulletin 32‑A‑JA980540) for procedural detail rather than reproducing steps in the AD.","Time‑bound compliance: effective date (22 July 1998) and final compliance date (31 July 1998) introduce scheduling pressure for operators.","Technical nature of inspections: requires maintenance personnel to assess wear‑indicator pin setting and heat‑pack wear (skill and tooling required).","Reference to Parts 1 and 2 of the Requirement document — potential ambiguity if those Parts are not immediately available to operators.","Cross‑reference to UK CAA AD 003‑07‑98 — coordination with foreign regulator but dependence on another regulator's findings.","Safety‑critical consequence: failure to detect a fully worn heat pack creates an operational safety risk, increasing regulatory scrutiny and recordkeeping."],"plain_english_summary":"This directive requires operators of British Aerospace Jetstream 3100/3200 aircraft to inspect main landing‑gear brake units — checking wear‑indicator pins and the brake heat‑pack condition — and to reset or repair indicator pins as specified in British Aerospace Alert Service Bulletin 32‑A‑JA980540. CASA set an effective date (22 July 1998) and a compliance deadline (actions by 31 July 1998). Operators pay for inspections and any corrective work; the rule changes routine maintenance procedures to avoid undetected, fully‑worn heat packs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-79-main-landing-gear-brake-unit","history":"/api/acts/ad-jetstream-79-main-landing-gear-brake-unit/history","analysis":"/api/acts/ad-jetstream-79-main-landing-gear-brake-unit/analysis","conflicts":"/api/acts/ad-jetstream-79-main-landing-gear-brake-unit/conflicts","importantCases":"/api/acts/ad-jetstream-79-main-landing-gear-brake-unit/important-cases","documents":"/api/acts/ad-jetstream-79-main-landing-gear-brake-unit/documents"}}