{"id":"F2006B07235","name":"AD/SWSA226/92 - Brake Master Cylinders","slug":"ad-swsa226-92-brake-master-cylinders","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49086,"registerId":"commonwealth-F2006B07235-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS 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 issues the following Airworthiness Directive (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\nFairchild (Swearingen) SA226 and SA227 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SWSA226/92 Brake Master Cylinders 9/2","sectionType":"part","heading":"AD/SWSA226/92 Brake Master Cylinders 9/2002","content":"# AD/SWSA226/92 Brake Master Cylinders 9/2002\n\nApplicability: SA226-AT, all serial numbers,\n\nSA226-T all serial numbers, SA226-T(B) all serial numbers, SA226-TC all serial numbers,\n\nSA227-AC, SA227-AT, and SA227-TT serial number 420 through 583 inclusive.\n\nRequirement: Replace the Skidmore Wilhelm Manufacturing Co. Model V1-15-1000 brake master cylinders with new or overhauled Model V1-15-1000 brake master cylinders, which have been overhauled to the requirements in Fairchild Service Bulletin 226-32-069 for SA226 aircraft, or Fairchild Service Bulletin 227-32-045 for SA227 aircraft.\n\nNote: FAA AD 2002-08-01 refers.\n\nCompliance: Unless previously accomplished; within 200 hours aircraft time in service after the effective date of this directive, or 15,000 hours brake master cylinder time in service, whichever comes later.\n\nThereafter at intervals not to exceed 15,000 hours time brake master cylinder in service.\n\nThis Airworthiness Directive becomes effective on 5 September 2002.\n\nBackground: Malfunctioning of the brake master cylinders can cause dragging brakes, which could overheat the brakes and lead to wheel well fire. Replacement with modified brake master cylinders is intended to overcome this problem.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 26 July 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive stays within the original safety-focused scope: it targets a specific component on specified aircraft to address a stated unsafe condition (brake drag/overheat/fire). It does not broaden applicability beyond the named aircraft/serial ranges, nor does it add requirements outside the component replacement/overhaul and recurrent interval described in the AD. The AD references manufacturer service bulletins for the technical means of compliance, but that is an implementation detail rather than a change in substantive scope."},"complexity_factors":["Short, focussed directive limited to a single component (brake master cylinder)","Clear applicability list but includes mixed \"all serial numbers\" and a limited serial-number range (SA227 420–583), requiring operators to check serials","Two-part compliance threshold (within 200 aircraft hours after AD effective date OR 15,000 hours master cylinder time, whichever is later) adds a conditional timing calculation","Recurrent interval requirement (every 15,000 hours brake master cylinder time) introduces ongoing scheduling/recordkeeping","Requires conformity with external documents (Fairchild Service Bulletins) and cross-references FAA AD 2002-08-01, introducing some dependency on outside materials","Limited number of actions and few exceptions — low nesting or layered exceptions"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- **Requires** replacement of Skidmore Wilhelm Model V1-15-1000 brake master cylinders on certain Fairchild (Swearingen) SA226 and SA227 aeroplanes with new or overhauled units that have been overhauled to the procedures in the applicable Fairchild Service Bulletin. (Requirement)\n- **Which aircraft are affected**: All SA226-AT, SA226-T, SA226-T(B), SA226-TC (all serial numbers) and SA227-AC, SA227-AT, and SA227-TT serial numbers 420 through 583 inclusive. (Applicability)\n- **When to comply**: Replace within 200 hours aircraft time after the AD takes effect, or when the brake master cylinder reaches 15,000 hours time in service, whichever is later. After replacement/overhaul, repeat the overhaul/replacement at intervals not to exceed 15,000 hours brake master cylinder time in service. (Compliance)\n- **Why**: The stated safety reason is that malfunctioning brake master cylinders can cause dragging brakes, overheating and possible wheel-well fire; the replacement/overhaul is intended to correct that unsafe condition. (Background)\n\n**Who this affects**\n\n- Aircraft owners and operators of the specified SA226 and SA227 aeroplanes (they must fund and schedule the work).\n- Maintenance organisations and overhaul facilities that perform the overhauls specified in the Fairchild Service Bulletin (they will carry out the work and issue records).\n- Regulatory/compliance staff who must record and show that the AD has been complied with during continuing airworthiness checks.\n\n**Practical effect and mechanics**\n\n- Operators must arrange either new master cylinders or overhauls performed to the Fairchild Service Bulletin requirements for the specified model V1-15-1000 unit. The AD points to the FAA AD for closely related requirements and guidance.\n- The AD sets a one-time action deadline (200 aircraft hours or 15,000 hours on the master cylinder, whichever is later) and then an ongoing recurrent interval (every 15,000 hours brake master cylinder time).\n\n**Costs, incentives and trade-offs (testing the stated purpose)**\n\n- Who pays: the aircraft owner/operator pays for parts, overhaul labour, and downtime (Cost). The maintenance/overhaul providers receive revenue from performing authorised overhauls (Concentrated benefit).\n- Incentives: the AD creates demand for compliant overhauls. If the service bulletin requires particular procedures or approvals, providers meeting those requirements will be preferred, which can concentrate business toward authorised or experienced overhaul shops (possible competitive advantage to some MROs).\n- Trade-offs: operators trade maintenance costs and aircraft downtime for reduced risk of brake drag, overheating and fire. The recurrent 15,000-hour interval creates predictable ongoing costs and scheduling needs.\n- Opportunity costs: time in dock and funds spent on compliance cannot be used for other maintenance or upgrades during that period.\n- Compliance burden and implementation risk: availability of overhauled parts or shops could create short-term scheduling congestion; accurate tracking of brake master cylinder hours is required to determine the later of the two compliance thresholds.\n- Effect on independent businesses: independent MROs can perform the work if they can meet the service bulletin's requirements; if the SB demands specialised tooling/approval, smaller shops may face higher entry costs.\n- Enforcement and recordkeeping: the AD creates a continuing airworthiness requirement that must be documented in maintenance records; failure to comply can render the aircraft unairworthy.\n\n**Concrete behaviour changes required**\n\n- Operators must inspect maintenance records to determine brake master cylinder hours and schedule replacement/overhaul within the AD’s deadline.\n- Maintenance providers must perform overhauls to the Fairchild Service Bulletin’s specifications and provide the required maintenance records.\n- Operators must schedule recurring overhaul/replacement at intervals not exceeding 15,000 hours brake master cylinder time.\n\n**References in the AD that affect implementation**\n\n- The AD requires compliance with Fairchild Service Bulletin 226-32-069 (SA226) or 227-32-045 (SA227). These external documents specify the technical overhaul steps; the AD enforces those procedures by reference.\n- The AD also refers to FAA AD 2002-08-01 for related guidance, which may be used by operators and maintenance organisations for interpreting acceptable compliance means.\n\n**Net effect**\n\n- The AD imposes a time-limited and then recurring mandatory maintenance action focused narrowly on one component (the V1-15-1000 brake master cylinder) on a defined set of aircraft. The stated safety aim is to prevent brake drag, overheating and wheel-well fire by replacing or overhauling the suspect units to the manufacturer’s specified procedures.\n"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. The scope remains tightly focused on the identified brake cylinder defect in the specified aircraft models. No scope creep is evident."},"complexity_factors":["Single, specific mechanical component targeted (brake master cylinders)","Only 4 aircraft models affected with clear serial number ranges","Straightforward replacement requirement with reference to existing manufacturer service bulletins","Simple compliance timeline: 200 hours OR 15,000 hours, whichever is later, then recurring every 15,000 hours","No nested exceptions, conditional logic, or extensive cross-referencing to other legislation","Minimal defined terms (only standard aviation terminology like 'time in service')"],"plain_english_summary":"This is a **safety order for specific aircraft** issued by Australia's aviation safety regulator (CASA). It mandates the replacement of faulty brake master cylinders on certain Fairchild Swearingen aeroplanes to prevent a serious fire hazard.\n\n**What it does:**\n- **Orders aircraft owners/operators** to replace specific brake master cylinders (Skidmore Wilhelm Model V1-15-1000) on particular Fairchild aircraft models\n- **Why:** Faulty cylinders can cause brakes to drag, overheat, and potentially start a fire in the wheel well\n- **When:** Within 200 flight hours or when the brake cylinder hits 15,000 hours of use—whichever comes later. After that, replacements must happen every 15,000 hours.\n\n**Who it affects:**\n- Owners and operators of specific Fairchild Swearingen aircraft: SA226-AT, SA226-T, SA226-T(B), SA226-TC, and SA227-AC, SA227-AT, and SA227-TT (serial numbers 420–583)\n\n**Why it matters:**\nDragging brakes aren't just a maintenance nuisance—they can overheat and cause in-flight fires. This directive forces a fix before that happens."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-92-brake-master-cylinders","history":"/api/acts/ad-swsa226-92-brake-master-cylinders/history","analysis":"/api/acts/ad-swsa226-92-brake-master-cylinders/analysis","conflicts":"/api/acts/ad-swsa226-92-brake-master-cylinders/conflicts","importantCases":"/api/acts/ad-swsa226-92-brake-master-cylinders/important-cases","documents":"/api/acts/ad-swsa226-92-brake-master-cylinders/documents"}}