{"id":"F2006B08593","name":"AD/CL-600/32 Amdt 2 - Underfloor Pressure Bulkhead at FS409.00","slug":"ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51471,"registerId":"commonwealth-F2006B08593-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Canadair) CL-600 (Challenger","sectionType":"part","heading":"Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","content":"# Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/32 Amdt 2 (Continued)\n\nAircraft that are visually determined to be crack free are to be re-inspected at intervals not to exceed 600 flight cycles; until modified in accordance with Bombardier Service Bulletins 600-0680, 601-0503, or 604-53-006, as applicable.\n\n    2. Aircraft that are visually determined to have cracks that do not extend up to the angles as specified in the Requirement, may only be returned to service under the following conditions:\n\n    No more than one crack exists at each corner; and,\n\n    b. Angles on the aft side of the web are visually confirmed to be crack free; and,\n\n    c. No crack extends under the angles; and,\n\n    d. Aircraft shall be re- inspected at intervals not exceeding 100 flight cycles; and,\n    e. The cracked bulkhead is to be repaired before the aircraft accumulates 600 flight cycles or within 12 months, whichever occurs first, after the date of initial detection of the crack.\n\nThe compliance times remain unchanged by this issue. This amendment becomes effective on 11 July 2002.\n\nBackground: A check of 105 Challenger aircraft has revealed 13 aircraft with fatigue cracks in the pressure bulkhead frame at the forward end of the wing box cutout.","sortOrder":0}],"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":4,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose — addressing fatigue cracks in the CL-600 series pressure bulkhead. While it adds a terminating modification option and refines inspection intervals, these are natural evolutions of the same safety issue rather than scope creep. The original intent (preventing bulkhead failure) and the affected aircraft population remain unchanged."},"complexity_factors":["Multiple conditional pathways: crack-free vs. cracked aircraft with sub-conditions for cracked cases (5 specific conditions in clause 2)","Cross-references to external technical documents: Bombardier Service Bulletins 600-0680, 601-0503, and 604-53-006 (three different documents for different aircraft variants)","Nested time limits: 600 flight cycles OR 12 months whichever occurs first, plus separate 100 flight cycle requirement for cracked aircraft","Technical aviation terminology requiring domain knowledge: 'pressure bulkhead', 'flight cycles', 'terminating action', 'angles on the aft side of the web'","Amendment history layering: references to Amendment 1, original issue, and Transport Canada AD revision creating contextual dependencies","Variant applicability: different service bulletins apply to different CL-600 series models (600, 601, 604)"],"plain_english_summary":"Owners and operators of Bombardier Challenger CL-600/601/604 jets in Australia must perform mandatory visual inspections of the underfloor pressure bulkhead for fatigue cracks and carry out required repairs. If no cracks are found, inspections repeat every 600 flight cycles until a permanent modification is fitted; limited, conditional continued flight is allowed with crack findings but requires 100-cycle rechecks and repair within 600 cycles or 12 months. The AD prevents depressurisation/structural failure and adds a terminating modification option."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 removed a specific repair date; Amendment 2 aligns with a revised Transport Canada AD by adding a modification (per Bombardier service bulletins) that provides terminating action for repeat inspections on aircraft that have not developed cracks. Compliance timeframes themselves remain unchanged."},"complexity_factors":["Conditional compliance paths (different inspection/repair rules depending on whether cracks are present)","Multiple distinct time limits (100‑cycle, 600‑cycle, 12‑month repair windows)","Reference to external service bulletins as terminating action (dependency on manufacturer documents)","Change history (amendments delete a fixed repair date and introduce modification-based termination) requiring operators to track versions","Enforcement relies on visual inspection judgments, creating potential for variability in determinations"],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier CL‑600 (Challenger) series aeroplanes to inspect the underfloor pressure bulkhead at FS409. Mechanically: aircraft found crack‑free must be visually re‑inspected every 600 flight cycles until modified per specified Bombardier service bulletins; aircraft with limited cracks may return to service only under strict conditions and face 100‑cycle re‑inspections and mandatory repair within 600 flight cycles or 12 months. It affects aircraft operators and maintenance organisations, who pay for inspections, repairs and any terminating modifications; CASA enforces compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00","history":"/api/acts/ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00/history","analysis":"/api/acts/ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00/analysis","conflicts":"/api/acts/ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00/conflicts","importantCases":"/api/acts/ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00/important-cases","documents":"/api/acts/ad-cl-600-32-amdt-2-underfloor-pressure-bulkhead-at-fs409-00/documents"}}