{"id":"F2006B06755","name":"AD/SAAB/5 - Flight Control System Bellcranks","slug":"ad-saab-5-flight-control-system-bellcranks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114582,"registerId":"commonwealth-F2006B06755-current","compilationNumber":null,"startDate":"2026-04-03","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\nSAAB “Safir” Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SAAB/5 Flight Control System Bellcran","sectionType":"part","heading":"AD/SAAB/5 Flight Control System Bellcranks 7/2002","content":"# AD/SAAB/5 Flight Control System Bellcranks 7/2002\n\nApplicability: Model Safir 91B, 91B2, 91C, and 91D aircraft, serial numbers 91-201 through 91- 474.\n\nRequirement: Inspect certain bellcranks in the flight control system using dye penetrant method, in accordance with SAAB Service Bulletin No. 91.4.002.\n\nUntil this action is accomplished, all aerobatic manoeuvres are prohibited and abrupt application of the flight controls should be avoided.\n\nNote: LFV AD 1685 refers.\n\nCompliance: Before 31 August 2002, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 11 July 2002.\n\nBackground: A recent check of foreign airworthiness directives received by the Authority revealed that several in the SAAB Safir series had never been received and assessed. This Directive requires inspections of certain bellcranks in the flight control system that were identified as being manufactured from “Hydronaulium”, which deteriorates with age and is susceptible to cracking.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 31 May 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 June 2002.","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific material defect in specific SAAB Safir aircraft. There is no evidence of scope creep; it targets exactly the safety issue identified in the background (aging Hydronaulium bellcranks) with precisely defined applicability."},"complexity_factors":["Single, specific aircraft type and limited serial number range","One clear mandatory action (inspection) with reference to external technical standard (SAAB Service Bulletin)","Simple binary compliance condition (before date or already done)","Minimal conditional logic — only interim operating restrictions pending compliance","No nested definitions, cross-references to other legislation, or interpretive provisions","Short document (approximately 250 words of substantive text)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of SAAB Safir 91B/91B2/91C/91D aircraft (serials 91-201 to 91-474) to inspect specific Hydronaulium bellcranks for cracking using dye-penetrant inspection per SAAB Service Bulletin No. 91.4.002. Until inspected, aerobatics are prohibited and sudden, harsh control inputs must be avoided. The inspection must be completed before 31 August 2002. This prevents possible flight‑control failure from age‑related metal cracking."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument implements inspections and temporary operational limits for the identified fleet to address Hydronaulium deterioration. The text shows no alteration or expansion of the original safety scope: it targets the specified models/serials and prescribes the inspection and interim operational restrictions."},"complexity_factors":["Narrow applicability to specific models and serial numbers (Applicability).","Single technical inspection method mandated (dye penetrant) and reference to SAAB Service Bulletin No. 91.4.002 (Requirement).","Temporary operational restrictions until compliance (prohibition on aerobatics; avoid abrupt control inputs) increase operational planning complexity (Requirement).","Fixed compliance deadline and effective date (Compliance: before 31 August 2002; effective 11 July 2002).","Safety rationale tied to material ageing of 'Hydronaulium' and foreign ADs (Background; Note: LFV AD 1685).","Regulatory enforcement via CASA delegate under CAR 1998 subreg 39.1(1) creates administrative authority and discretion."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of SAAB Safir 91B, 91B2, 91C and 91D aircraft (serials 91-201 to 91-474) to inspect specific flight‑control bellcranks using a dye‑penetrant method per SAAB Service Bulletin No. 91.4.002 because the alloy “Hydronaulium” can age and crack. Until inspection, aerobatic manoeuvres are banned and abrupt control inputs must be avoided. The AD was issued by the CASA delegate under CAR 1998 subreg 39.1(1); compliance is required by 31 August 2002. Costs and work time fall to aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-saab-5-flight-control-system-bellcranks","history":"/api/acts/ad-saab-5-flight-control-system-bellcranks/history","analysis":"/api/acts/ad-saab-5-flight-control-system-bellcranks/analysis","conflicts":"/api/acts/ad-saab-5-flight-control-system-bellcranks/conflicts","importantCases":"/api/acts/ad-saab-5-flight-control-system-bellcranks/important-cases","documents":"/api/acts/ad-saab-5-flight-control-system-bellcranks/documents"}}