{"id":"F2006L01298","name":"AD/PC-12/48 - Centre Fuselage Frame 21","slug":"ad-pc-12-48-centre-fuselage-frame-21","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58765,"registerId":"commonwealth-F2006L01298-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pilatus PC-12 Series Aeroplanes","sectionType":"division","heading":"Pilatus PC-12 Series Aeroplanes","content":"### Pilatus PC-12 Series Aeroplanes\n\n| AD/PC-12/48 | Centre Fuselage Frame 21 | 6/2006 |\n| ----------- | ------------------------ | ------ |\n\n| Applicability: | Model PC-12 and PC-12/45 aircraft, manufacturer serial numbers 101 through 617.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Perform an inspection of Centre Fuselage Frame 21 (FR21) in the area of the outer sidewall frame attachment lug forward and aft side faces, left and right, to determine if there is any drill damage.If damage is detected during the Requirement 1 inspection that is less than 0.1 mm (0.004-inch), before further flight, repair the damage in accordance with Pilatus PC-12 Service Bulletin No. 53-004.If damage is detected during the Requirement 1 inspection that is more than 0.1 mm (0.004-inch), before further flight, contact Pilatus Aircraft Ltd. for technical advice.2. Perform an inspection of FR21 in the area of the top surface of the wing upper-attachment lugs, left and right, to determine if there is any drill damage.If damage is detected during the Requirement 2 inspection that is less than 0.1 mm (0.004-inch), before further flight, repair the damage in accordance with Pilatus PC-12 Service Bulletin No. 53-004.If damage is detected during the Requirement 2 inspection that is more than 0.1 mm (0.004-inch), before further flight, contact Pilatus Aircraft Ltd. for technical advice.Note: FOCA AD HB-2006-223 refers. |\n| Compliance:    | Within 12 months after 8 June 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 8 June 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n\n| Background: | The Federal Office for Civil Aviation received reports of drill mark damage on some Centre Fuselage Frame 21 lug fittings on the production line, and during a number of mid life wing lug inspections. The damage to the lug fittings is thought to have occurred during assembly of the aircraft. Depending on the size and location of damage, the fatigue life of the wing attachment lugs may be affected. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)\n\nRichard Castles  \nDelegate of the Civil Aviation Safety Authority\n\n19 April 2006","sortOrder":0},{"sectionNumber":"AD/PC-12/48","sectionType":"part","heading":"AD/PC-12/48","content":"## AD/PC-12/48","sortOrder":1},{"sectionNumber":"Centre Fuselage Frame 21","sectionType":"part","heading":"Centre Fuselage Frame 21","content":"## Centre Fuselage Frame 21","sortOrder":2},{"sectionNumber":"6/2006","sectionType":"part","heading":"6/2006","content":"## 6/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to PC‑12 and PC‑12/45 aircraft with serial numbers 101–617 and to inspections/repairs of FR21 lug fittings as described. The text shows no expansion or narrowing beyond addressing reported drill damage during production and mid‑life inspections; requirements, thresholds and remedies are confined to those aircraft and those FR21 lug areas (Applicability; Requirement; Background)."},"complexity_factors":["Precise damage threshold: a small numerical limit (0.1 mm / 0.004 in) requires measurement to fine tolerances and clear inspection technique (Requirement 1 & 2).","External repair procedure dependency: repairs for ≤0.1 mm must follow Pilatus PC‑12 Service Bulletin No. 53‑004, creating dependency on an external document for compliance (Requirement 1 & 2).","Manufacturer discretion for larger defects: any damage >0.1 mm requires operators to contact Pilatus for technical advice, giving the manufacturer a decision role in remediation (Requirement 1 & 2).","Who bears cost and action: inspections, repairs and any follow‑up technical consultations are obligations on the aircraft owner/operator and must be done 'before further flight', concentrating costs and downtime on operators (Requirement; Compliance).","Limited applicability window: applies only to serial numbers 101–617, requiring operators to determine applicability precisely (Applicability).","Fixed compliance deadline: all work is required within 12 months after 8 June 2006, imposing a scheduling and resource constraint (Compliance).","Potential ambiguity in inspection scope and access: the AD describes areas to inspect but does not prescribe detailed inspection methods or access requirements, which may create interpretation or access-cost issues (Requirement; Background).","Cross‑reference to other authority: the AD notes FOCA AD HB‑2006‑223, introducing an additional regulatory reference to consider (Requirement note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Pilatus PC‑12 and PC‑12/45 aeroplanes (manufacturer serial numbers 101–617) to inspect Centre Fuselage Frame 21 (FR21) lug areas for drill damage. If damage is ≤0.1 mm it must be repaired per Pilatus Service Bulletin No. 53‑004 before further flight; if >0.1 mm the operator must contact Pilatus for technical advice. The inspections must be completed within 12 months of 8 June 2006 because such damage may affect the fatigue life of wing attachment lugs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific manufacturing defect in a specific aircraft type. The scope remains tightly focused on the original safety concern regarding drill damage to Centre Fuselage Frame 21."},"complexity_factors":["Very short document (approximately 300 words of substantive content)","Only 2 defined inspection requirements with clear conditional logic (if-then structure)","Single applicability criterion (specific aircraft models and serial numbers)","No cross-references to other legislation or regulations (only a note referencing a Swiss aviation authority document)","Simple compliance deadline (12 months from effective date)","Minimal technical terminology, with measurements provided in both metric and imperial units"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of Pilatus PC‑12/45 aircraft (S/N 101–617) to inspect Centre Fuselage Frame 21 for manufacturing drill damage to wing‑attachment lugs. Minor damage (<0.1 mm) must be repaired per Pilatus service guidance; larger damage requires contacting Pilatus for technical advice before further flight. Action was required by 8 June 2007 to prevent reduced fatigue life and the remote risk of wing separation."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-48-centre-fuselage-frame-21","history":"/api/acts/ad-pc-12-48-centre-fuselage-frame-21/history","analysis":"/api/acts/ad-pc-12-48-centre-fuselage-frame-21/analysis","conflicts":"/api/acts/ad-pc-12-48-centre-fuselage-frame-21/conflicts","importantCases":"/api/acts/ad-pc-12-48-centre-fuselage-frame-21/important-cases","documents":"/api/acts/ad-pc-12-48-centre-fuselage-frame-21/documents"}}