{"id":"F2006B04865","name":"AD/CASA/1 Amdt 5 - Fatigue Inspections and Retirement Lives","slug":"ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44672,"registerId":"commonwealth-F2006B04865-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/1 Amdt 5 - Fatigue Inspections and Retirement Lives","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CASA/1 Amdt 4 and issues the following AD under subregulation 39.1 (1) of CASR 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\n![](image.001.png)  \n\nCasa 212 Series Aeroplanes\n\nAD/CASA/1\n\nAmdt 5\n\n  \nFatigue Inspections and Retirement Lives 4/2004\n\nApplicability: All Model C-212-CB, \\-CC, \\-CD, \\-CE, \\-CF, \\-VA, \\-DD and \\-DF aircraft.\n\nRequirement: 1. Inspect the Principal Structural Elements in accordance with the thresholds and intervals specified in CASA Document C-212-PV-02-SID dated 1 June 1997.\n\n2. For Model C-212-CB aircraft, retire from service the horizontal stabiliser to fuselage attachments:\n\nReplace part number 212-31101.05 attachment by the same part number attachment.\n\nReplace part number 212-31102.05 attachment by the same part number attachment.\n\nNote: Spain DGAC AD 02/88 Revision 3 refers.\n\nCompliance: 1. Upon the accumulation of 20,000 landings or 20,000 flight hours, whichever occurs first.\n\nFor aircraft operating more than 10% of their flights at heights lower than 3,000 feet, or with an average flight duration exceeding 80 minutes, the operator must contact the manufacturer in order to confirm the applicability to the aircraft of the inspection requirements established in CASA document C-212-PV-02-SID.\n\nAfter the initial inspection, any such aircraft must have a document from the manufacturer, acceptable to the Authority, which specifies that the inspection requirements in CASA Document C-212-PV-02-SID remain appropriate, or which specifies new inspection requirements.\n\nThereafter, inspect at intervals established in the Requirement document or intervals adjusted to a particular type of operation, whichever is applicable.\n\n2. Before the accumulation of 16,500 landings.\n\nThe compliance thresholds of the previous issue of this directive remain unchanged.\n\nCasa 212 Series Aeroplanes\n\nAD/CASA/1 Amdt 5 (continued)\n\nThis Amendment becomes effective on 15 April 2004.\n\nBackground: The original issue of this directive quoted retirement lives based on calculation. The manufacturer has completed an extensive series of fatigue tests resulting in a Structural Inspection Document, which is a significantly improved programme for maintaining structural airworthiness.\n\nAmendment 4 was issued in response to the issue of a new Requirement document which contains volumes 1 and 2 of the previous document, while volume 3 is now contained in a separate document entitled “Supplemental Inspection Procedures”.\n\nAmendment 5 is issued in response to the issue of Revision 3 of the Requirement document, which requires replacement of the horizontal stabiliser to fuselage attachments on \\-CB model aircraft at retirement with attachments of the same part number.\n\nAmendment 4 of this airworthiness directive became effective on 10 September 1998\\. Amendment 3 of this airworthiness directive became effective on 27 April 1995.\n\nThe original issue of this airworthiness directive became effective on 31 March 1982.\n\n![](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 5 March 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 March 2004.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 5 refines and updates the existing fatigue inspection and retirement-life regime rather than substantially broadening it. The instrument replaces calculation-based retirement lives with a manufacturer-backed Structural Inspection Document and adds a targeted retirement/replacement requirement for two attachments on the C-212-CB model. Those changes adjust and specify compliance mechanics and introduce an extra parts-retirement obligation, but they remain within the original AD’s purpose of managing structural fatigue and retirement lives rather than expanding the AD to new safety domains or additional aircraft types."},"complexity_factors":["Reliance on external technical documents (CASA Document C-212-PV-02-SID dated 1 June 1997) and a foreign AD (Spain DGAC AD 02/88 Rev 3)","Dual compliance metrics and thresholds: 20,000 landings OR 20,000 flight hours for initial inspection, and a separate 16,500 landings threshold for part retirement","Operational-condition exceptions: special rule if >10% of flights below 3,000 ft or average flight duration >80 minutes","Requirement for a manufacturer document that must be \"acceptable to the Authority\" introduces administrative discretion","Ambiguous language: \"replace ... by the same part number attachment\" can be read multiple ways (new part, serviceable spares, overhaul)","Revocation of prior amendment and retention of previous compliance thresholds creates cross-version continuity to check","Short primary text but substantive technical detail delegated to external SID (hidden complexity)"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Revokes the prior AD/CASA/1 Amdt 4 and issues Amendment 5 to Airworthiness Directive AD/CASA/1 (for CASA 212 series aeroplanes). (Preamble)\n- Requires inspection of the Principal Structural Elements (PSE) of the listed CASA 212 models in accordance with CASA Document C-212-PV-02-SID dated 1 June 1997. (Requirement 1)\n- Imposes a retirement/replace requirement for the horizontal stabiliser-to-fuselage attachment fittings on Model C-212-CB aircraft: specified part numbers 212-31101.05 and 212-31102.05 must be replaced with the same part-number attachments at retirement. (Requirement 2)\n\n**Who is affected**\n\n- Operators (owners, maintenance organisations and lessees) of all Model C-212-CB, -CC, -CD, -CE, -CF, -VA, -DD and -DF aircraft. (Applicability)\n\n**When action must be taken (compliance timing and conditions)**\n\n- The initial structural inspection is required when the aircraft reaches 20,000 landings or 20,000 flight hours, whichever occurs first; thereafter inspections follow the intervals in the CASA Document or intervals adjusted for particular operations. (Compliance para 1)\n- If an aircraft operates more than 10% of flights below 3,000 feet or has an average flight duration over 80 minutes, the operator must contact the manufacturer to confirm whether the CASA Document inspection requirements apply to that aircraft. The operator must then hold a manufacturer’s document (acceptable to the Authority) either confirming the existing inspection regime or specifying new inspection requirements. (Compliance para 1)\n- For the -CB model, the specified stabiliser-to-fuselage attachments must be retired (replaced) before the accumulation of 16,500 landings. (Requirement 2; Compliance para 2)\n\n**Why it was issued (stated rationale)**\n\n- The manufacturer completed extensive fatigue testing and produced a Structural Inspection Document (SID). The SID (CASA Document cited above) supplants earlier, calculation-based retirement lives and sets out a more detailed inspection programme. Amendment 5 responds to Revision 3 of that Requirement document and adds the specific attachment retirement instruction for the -CB model. (Background)\n\n**Who pays, who decides, and what behaviour changes**\n\n- Operators pay for the inspections, record-keeping and parts replacement. Maintenance organisations (or approved maintenance providers) will perform the inspections and replacements under normal maintenance contracts.\n- The manufacturer is responsible for providing supporting documentation (the SID and any follow-up confirmations) and for being contacted where the aircraft’s operational profile meets the specified conditions. CASA (the Authority) decides whether a manufacturer document is acceptable. (Compliance para 1)\n- Behaviours that change: operators must (a) monitor accumulations of landings and flight hours against the specified thresholds; (b) perform inspections per the SID; (c) for certain operational profiles, seek manufacturer confirmation and retain that document; and (d) on -CB models, remove/replace the listed attachments before 16,500 landings. (Requirement & Compliance)\n\n**Costs, incentives, trade-offs and implementation risks**\n\n- Direct costs: inspection labour, downtime, and parts and fitment costs for replacement attachments. These costs are borne by operators and captured by maintenance providers. (Requirement & Compliance)\n- Concentrated benefits and suppliers: the replacement requirement creates direct demand for the specified attachment parts and for maintenance labour; this is a concentrated, identifiable source of business for parts suppliers and MROs (maintenance, repair and overhaul providers). (Requirement 2)\n- Administrative burden and discretion: the rule requires operators to obtain a manufacturer document that is \"acceptable to the Authority,\" creating administrative interaction with CASA and some regulatory discretion about acceptability. (Compliance para 1)\n- Operational complexity: the AD uses mixed metrics and conditional rules (landings vs flight hours; special rules for low-altitude or long-duration operations), which increases record-keeping and may require operational analysis to determine applicable inspection regimes. (Compliance para 1)\n- Ambiguity risk: the phrase \"replace ... by the same part number attachment\" can be read as replacing with a new part having the same part number, or fitting any serviceable item of that part number; this may require clarifying guidance to avoid disputes about whether overhauled or previously issued parts are acceptable. (Requirement 2)\n- Substitution and safety trade-off: replacing an older fitting with the same part number at a fixed retirement point reduces risk from aged fittings but does not introduce a redesigned (improved) part; operators cannot substitute a different design unless approved. (Requirement 2; Background)\n\n**Cross-references and reliance on external technical material**\n\n- The AD delegates substantive technical detail to CASA Document C-212-PV-02-SID (dated 1 June 1997) and refers to Spain DGAC AD 02/88 Revision 3. The AD sets legal requirements but defers technical parameters and inspection procedures to those external documents. (Requirement & Note)\n\n**Practical compliance checklist for an affected operator**\n\n- Verify model applicability against the list in the AD.\n- Track landings and flight hours to determine when the 20,000 threshold (inspection) or 16,500 threshold (attachment retirement for -CB) will be reached. (Compliance)\n- For operators with >10% flights below 3,000 ft or average flight >80 min, contact the manufacturer in advance and obtain written confirmation acceptable to CASA. (Compliance para 1)\n- Schedule and perform inspections per CASA Document C-212-PV-02-SID and document compliance for CASA inspection/audit purposes. (Requirement 1)\n- On -CB models, remove and replace the two specified attachment part numbers before 16,500 landings and retain records demonstrating that replacement. (Requirement 2; Compliance para 2)\n\n**Net summary**\n\nThis AD replaces an earlier calculation-based retirement regime with a manufacturer-backed Structural Inspection Document and imposes a specific retirement/replacement requirement for two horizontal stabiliser attachment parts on the C-212-CB model. It shifts technical detail to the SID, creates an administrative requirement to secure manufacturer confirmation for certain operational profiles, and requires operators to bear inspection and parts-replacement costs. (Requirement; Compliance; Background)"},"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":4,"scope_assessment":{"changed":true,"description":"The original 1982 directive established basic retirement lives based on theoretical calculations. Over successive amendments (particularly Amendments 4 and 5), the scope has expanded from simple retirement rules to a comprehensive structural integrity programme incorporating: (1) detailed inspection protocols from a multi-volume technical document, (2) operational-specific compliance variations requiring manufacturer consultation, (3) specific part replacement mandates for certain models, and (4) ongoing surveillance rather than one-time retirement. The directive has evolved from a simple 'retire at X hours' rule to a sophisticated fatigue management system."},"complexity_factors":["Multiple aircraft models covered with slightly different requirements (CB model has specific part replacement rule not applicable to other models)","Dual compliance triggers (landings OR flight hours, whichever first)","Conditional logic for low-altitude/long-duration operations requiring manufacturer consultation","Cross-reference to external technical document (CASA Document C-212-PV-02-SID) not reproduced in the AD itself","Reference to foreign aviation authority document (Spain DGAC AD 02/88 Revision 3)","Nested timing requirements: initial inspection threshold, then ongoing intervals, with potential for customised intervals"],"plain_english_summary":"Owners and operators of Casa 212 (CB, CC, CD, CE, CF, VA, DD, DF) must follow a CASA Airworthiness Directive requiring fatigue inspections of principal structural elements per C-212-PV-02-SID after 20,000 landings or flight hours, with special confirmation or a CASA-approved plan if >10% of flights are below 3,000 ft or average flight >80 minutes. For CB models, horizontal stabiliser attachments must be replaced before 16,500 landings. The AD prevents fatigue-related structural failures in ageing aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives","history":"/api/acts/ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives/history","analysis":"/api/acts/ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives/analysis","conflicts":"/api/acts/ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives/conflicts","importantCases":"/api/acts/ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives/important-cases","documents":"/api/acts/ad-casa-1-amdt-5-fatigue-inspections-and-retirement-lives/documents"}}