{"id":"F2013L00523","name":"AD/P68/28 Amdt 4 - Engine Mount Fittings","slug":"ad-p68-28-amdt-4-engine-mount-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":172766,"registerId":"commonwealth-F2013L00523-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Partenavia P68 Series Aeroplanes","sectionType":"division","heading":"Partenavia P68 Series Aeroplanes","content":"### Partenavia P68 Series Aeroplanes\n\n| AD/P68/28 Amdt 4 | Engine Mount Fittings | 6/2013 |\n| ---------------- | --------------------- | ------ |\n\n| Applicability: | All Models.                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with Partenavia SB No 70 Rev 2.Note: Para 1-13B of the Requirement document specifies 75/1000 of local thickness, e.g. if local thickness is 3 mm (0.125\") then max allowable corrosion depth is 0.24 mm (0.009\").                                                                                                                                                                  |\n| Compliance:    | Section 1: Unless already accomplished in accordance with previous revisions of the Requirement document, prior to the issue of the next Maintenance Release after 25 October 1989, or prior to 5 calendar years since the date of manufacture. Thereafter in accordance with Section 3.Section 3: Every 500 hours time in service or 2 years, whichever happens first, after compliance with Section 1. |\n|                | This Amendment becomes effective on 29 March 2013.                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | Reports of corrosion and extensive cracking of the engine mount attachment fittings have been received.Amendment 3 clarified the 75/1000 allowable corrosion depth and called for a re‑inspection where 1.9 mm (0.075\") may have been used as the acceptance/rejection criterion.Amendment 4 makes reference to Partenavia Service Bulletin No 70 rev 2.                                                 |\n\nPeter Nikolic  \nDelegate of the Civil Aviation Safety Authority\n\n12 March 2013","sortOrder":0},{"sectionNumber":"AD/P68/28 Amdt 4","sectionType":"part","heading":"AD/P68/28 Amdt 4","content":"## AD/P68/28 Amdt 4","sortOrder":1},{"sectionNumber":"Engine Mount Fittings","sectionType":"part","heading":"Engine Mount Fittings","content":"## Engine Mount Fittings","sortOrder":2},{"sectionNumber":"6/2013","sectionType":"part","heading":"6/2013","content":"## 6/2013","sortOrder":3}],"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":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: ensuring the airworthiness of engine mount fittings on Partenavia P68 aircraft. Amendment 4 simply updates the referenced service bulletin to Revision 2. The scope has not expanded beyond the specific safety issue (corrosion/cracking in engine mount fittings) identified in the original directive."},"complexity_factors":["Short, single-purpose directive with clear applicability","Only one primary technical reference (Partenavia SB No 70 Rev 2)","Simple compliance structure: initial inspection + recurring interval","One mathematical calculation required (75/1000 of local thickness)","Some redundancy in document formatting (repeated headers/titles appear to be artifacts)","Cross-references to previous amendments for background context but does not require reading them to comply"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and, if needed, repair/replacement of engine mount fittings on Partenavia P68 aeroplanes due to reported corrosion and cracking that could lead to engine separation. Owners, operators and maintenance organisations in Australia must follow Partenavia Service Bulletin No. 70 Rev.2, perform an initial inspection (per the AD timing) and repeat every 500 flight hours or 2 years, with a corrosion depth limit of 75/1000 of local thickness."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Applicability remains all Partenavia P68 models. Amendment 4 updates and clarifies the technical acceptance criterion (75/1000 of local thickness) and refers to Service Bulletin No 70 Rev 2, but does not expand the set of aircraft or introduce new categories of persons required to comply (Applicability; Requirement; Background)."},"complexity_factors":["Cross-reference to an external technical document (Partenavia SB No 70 Rev 2) for required actions (Requirement).","A technical acceptance criterion expressed as a proportion of local thickness (75/1000), requiring measurement/engineering judgment (Note: Para 1-13B).","Multiple compliance timing conditions (initial deadline tied to next Maintenance Release or 5 years since manufacture; recurring every 500 hours or 2 years) that must be coordinated with operator maintenance planning (Compliance: Section 1 and Section 3).","Amendment history and corrective re‑inspection requirement where earlier incorrect criterion may have been used (Background / Amendment 3 reference), adding operational uncertainty for affected inspections.","Applicability across all P68 models, creating a fleet‑wide administrative and cost impact (Applicability)."],"plain_english_summary":"This airworthiness directive requires owners/operators of Partenavia P68 series aeroplanes to inspect engine‑mount attachment fittings for corrosion and cracking and to follow Partenavia Service Bulletin No 70 Rev 2. It specifies an allowable corrosion depth (75/1000 of local thickness), sets an initial compliance window and recurring inspections every 500 flight hours or two years; owners/operators pay for inspections, repairs and any maintenance schedule changes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p68-28-amdt-4-engine-mount-fittings","history":"/api/acts/ad-p68-28-amdt-4-engine-mount-fittings/history","analysis":"/api/acts/ad-p68-28-amdt-4-engine-mount-fittings/analysis","conflicts":"/api/acts/ad-p68-28-amdt-4-engine-mount-fittings/conflicts","importantCases":"/api/acts/ad-p68-28-amdt-4-engine-mount-fittings/important-cases","documents":"/api/acts/ad-p68-28-amdt-4-engine-mount-fittings/documents"}}