{"id":"F2006B05666","name":"AD/PA-30/24 - Fuselage Aft Bulkhead - Inspection and Modification","slug":"ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135386,"registerId":"commonwealth-F2006B05666-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-30/24 - Fuselage Aft Bulkhead - Inspection and Modification","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)  Piper PA-30 & 39 (Twin Comanche) Series Aeroplanes\n\n \n\nAD/PA-30/24 Fuselage Aft Bulkhead - Inspection\n\nand Modification\n\n\n3/74\n\n \n\nApplicability: All model PA-30 with S/Nos. 30-1 to 30-2000 and all model PA-39 with S/Nos. 39-1 to 39-155 not incorporating kit Piper P/N 760783.\n\n \n\nDocument: Piper SL No. 679.\n\n \n\nCompliance: Within 100 hours time in service after 29 March 1974 and thereafter at intervals not exceeding 100 hours time in service until modified.\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\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on a known structural issue with particular Piper aircraft models. It has not expanded beyond its original purpose of ensuring the airworthiness of the fuselage aft bulkhead through inspection and modification requirements."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 4 defined elements: applicability (serial number ranges), reference document (Piper SL No. 679), compliance timeframe, and modification kit part number","Single conditional requirement: inspections continue 'until modified'","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Clear, unambiguous compliance deadline and recurring interval","No nested exceptions or complex definitional sections"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Piper PA-30 and PA-39 Twin Comanche aircraft** (certain serial numbers only).\n\n**What it requires:**\n- **Inspection:** Owners/operators must inspect the **fuselage aft bulkhead** (the rear structural wall of the aircraft body) within 100 hours of flying time after 29 March 1974, and then re-inspect it every 100 hours of flying time thereafter.\n- **Modification:** These repeated inspections must continue **until the aircraft is modified** with a specific Piper kit (part number 760783). Once that modification is done, the recurring inspections stop.\n\n**Why it matters:**\nThe aft bulkhead is critical to the aircraft's structural integrity. This AD was issued because of a safety concern (referenced in Piper Service Letter No. 679) that could affect airworthiness — potentially risking structural failure if not addressed. It forces operators to either keep checking for problems regularly or fix it permanently with the approved modification.\n\n**Who must comply:**\nAnyone operating the affected aircraft models in Australia — private owners, flying schools, charter operators — must follow this schedule or face regulatory penalties and potentially have their aircraft grounded."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text supplied sets an initial, specific scope: certain PA-30 and PA-39 serial numbers are covered, with an exclusion for aircraft fitted with Piper kit P/N 760783, and a compliance regime of inspections every 100 hours TIS until modification. The directive text does not indicate any change in scope from its original framing."},"complexity_factors":["Clear, narrowly framed applicability by model and serial number (lowers complexity)","Requirement references an external technical document (Piper SL No. 679) which must be obtained and followed (adds procedural complexity)","Recurring inspection interval (every 100 hours TIS) until modification creates ongoing operational compliance burden","Exclusion for aircraft with a specific kit part number (Piper P/N 760783) introduces a simple eligibility determination","No detailed procedural text in the directive itself — operators must consult the referenced service letter for execution details"],"plain_english_summary":"This CASA airworthiness directive requires owners/operators of specified Piper PA-30 and PA-39 aircraft (by serial number) to inspect the fuselage aft bulkhead and then complete a follow-on modification per Piper Service Letter No. 679; aircraft already fitted with Piper kit P/N 760783 are excluded.  \n\nInspections must occur within 100 hours TIS and repeat at ≤100‑hour intervals until the modification is done; owners/operators bear inspection, repair and modification costs and must use certificated maintenance personnel."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification","history":"/api/acts/ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification/history","analysis":"/api/acts/ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification/analysis","conflicts":"/api/acts/ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification/important-cases","documents":"/api/acts/ad-pa-30-24-fuselage-aft-bulkhead-inspection-and-modification/documents"}}