{"id":"F2006B05343","name":"AD/P68/16 Amdt 1 - Engine and Engine Mount Attach Bolts","slug":"ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45843,"registerId":"commonwealth-F2006B05343-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P68/16 Amdt 1 - Engine and Engine Mount Attach Bolts","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Partenavia P68 Series Aeroplanes\n\n \n\nAD/P68/16\n\nAmdt 1\n\n\nEngine and Engine Mount Attach Bolts 4/89\n\n \n\nApplicability: P68, P68B, P68R, P68C, P68 Obs, P68-TC, and P68-TC Obs.\n\n \n\nRequirement: 1. Inspect the MS bolts attaching the engine to the engine mount and the MS bolts attaching the engine mount to the aircraft structure in accordance with Partenavia\n\nS.B. 76 Rev 1.\n\n \n\n2. Check the nuts associated with the bolts in para 1 for correct torque loading. Compliance:              1. At each engine installation.\n\n2. At intervals not exceeding 100 hours time in service.\n\n \n\nBackground:  This Amendment revises the original Australian Requirement to include recently published manufacturer’s inspection criteria, and to expand the Applicability.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The Amendment revises the original requirement to include the manufacturer's inspection criteria (Partenavia S.B. 76 Rev 1) and to expand the applicability to additional P68 variants, thereby broadening the set of affected aircraft and prescribing a specific service bulletin as the inspection standard (Background; Applicability; Requirement 1)."},"complexity_factors":["Narrow technical scope: applies only to listed P68 variants (Applicability).","Procedure reliance: inspection and acceptance criteria are delegated to Partenavia S.B. 76 Rev 1 (Requirement 1).","Clear scheduling rule: inspections required at each engine installation and at intervals not exceeding 100 hours TIS (Compliance 1–2) — low legal ambiguity, moderate operational scheduling.","Practical maintenance burden: requires mechanical inspection and torque checks by qualified personnel with appropriate tools (Requirement 2).","Limited regulatory discretion: directive prescribes actions and intervals rather than discretionary standards, reducing interpretive complexity.","Amendment effect: expands applicability and inserts manufacturer criteria, changing the set of affected aircraft and the technical standard (Background)."],"plain_english_summary":"Mechanically, this airworthiness directive requires operators of specified Partenavia P68 series aeroplanes (P68, P68B, P68R, P68C, P68 Obs, P68‑TC, P68‑TC Obs) to inspect the MS bolts that attach the engine to the mount and the mount to the airframe and to check the associated nuts for correct torque, using Partenavia Service Bulletin 76 Rev 1. Inspections are required at each engine installation and thereafter at intervals not exceeding 100 hours time in service. Owners/operators must carry out and fund the checks."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The Background explicitly states this Amendment expands the 'Applicability' (which aircraft models are covered) compared to the original 1989 directive. It also updates the technical requirements to incorporate newer manufacturer inspection criteria."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 substantive requirements with clear compliance triggers","Single cross-reference to manufacturer document (Partenavia S.B. 76 Rev 1)","No defined terms section — uses standard aviation terminology","Simple conditional logic: 'at each engine installation' and 'intervals not exceeding 100 hours'","No nested exceptions or layered conditions"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** This directive orders owners and operators of certain Partenavia P68 series aeroplanes to inspect critical bolts that hold the engine and engine mount in place. Specifically:\n- **Inspect** the bolts connecting the engine to the engine mount, and the bolts connecting the mount to the aircraft frame, following the manufacturer's Service Bulletin 76 Revision 1.\n- **Check** that the nuts on these bolts are tightened to the correct torque (tightness) specification.\n\n**Who it affects:** Owners and operators of these Partenavia models: P68, P68B, P68R, P68C, P68 Obs, P68-TC, and P68-TC Obs.\n\n**When you must comply:**\n- **Inspection:** Every time an engine is installed (e.g., after maintenance or replacement).\n- **Torque check:** At least every 100 hours of flight time.\n\n**Why it matters:** Engine mount bolts are literally what keeps the engine attached to the aircraft. If these fail, the engine could detach in flight — catastrophic failure. This amendment updates the original 1989 directive to include newer manufacturer guidance and expands which aircraft models are covered."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts","history":"/api/acts/ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts/history","analysis":"/api/acts/ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts/analysis","conflicts":"/api/acts/ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts/conflicts","importantCases":"/api/acts/ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts/important-cases","documents":"/api/acts/ad-p68-16-amdt-1-engine-and-engine-mount-attach-bolts/documents"}}