{"id":"F2006B05763","name":"AD/PA-31/59 Amdt 1 - Horizontal Stabiliser and Vertical Fin Stringer Attach Rivets - Inspection","slug":"ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135622,"registerId":"commonwealth-F2006B05763-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/59 Amdt 1 - Horizontal Stabiliser and Vertical Fin Stringer Attach Rivets - Inspection","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-31 Series Aeroplanes\n\n \n\nAD/PA-31/59\n\nAmdt 1\n\n\nHorizontal Stabiliser and Vertical Fin Stringer Attach Rivets - Inspection\n\n\n5/78\n\n \n\nApplicability: All models PA-31 and PA-31-325 with S/Nos. 31-465, 31-7712057 to 31-7712078, 31-7712081, 31-7712083. All models PA-31-350 with S/Nos. 31-7752099, 31-\n\n7752101, 31-7752103, 31-7752105 to 31-7752114, 31-77521117 to 31-7752131, 31-\n\n7752134 to 31-7752138.\n\n \n\nDocument: 1. Piper SB No. 575; or\n\n \n\n2. FAA AD 77-24-01 Amdt. 39-3083.\n\n \n\nCompliance: Unless already accomplished within 100 hours time in service after 1 June 1978.\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 narrow, targeted safety directive focused on a specific mechanical inspection for specific aircraft. It has not expanded beyond its original purpose of ensuring airworthiness of particular Piper aircraft models."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 defined elements: applicability (aircraft models/serial numbers), reference documents, compliance deadline, and the specific components to be inspected","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, clear compliance condition with one exception clause ('Unless already accomplished')","No nested exceptions or conditional logic","Straightforward technical terminology with specific part references"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates safety inspections for specific Piper PA-31 series aircraft.\n\n**What it does:**\n- Requires owners/operators to inspect the **rivets** (metal fasteners) that attach the **stringers** (structural support strips) to the **horizontal stabiliser** (the small wing at the tail that keeps the plane level) and **vertical fin** (the upright tail section)\n\n**Who it affects:**\n- Owners and operators of specific Piper PA-31, PA-31-325, and PA-31-350 aircraft with particular serial numbers listed in the document\n\n**Why it matters:**\n- Faulty or loose rivets in these critical tail structures could lead to structural failure, potentially causing loss of control of the aircraft. This directive ensures these specific aircraft are checked for this known safety issue.\n\n**What must be done:**\n- The inspection must be completed within **100 hours of flight time** after 1 June 1978, unless already done\n- The work must follow either Piper Service Bulletin No. 575 or FAA Airworthiness Directive 77-24-01"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This instrument is labelled as Amendment 1 to AD/PA-31/59, indicating it modifies the original AD. The amendment specifies the affected models and serial-number ranges (Applicability), cites the technical documents that define the inspection procedures (Piper SB No. 575 or FAA AD 77-24-01) (Document), and sets the compliance timing as 'unless already accomplished within 100 hours time in service after 1 June 1978' (Compliance). The text provided does not include the original AD wording, so the exact nature of the amendment (what wording was added, removed, or changed) cannot be traced from this extract alone."},"complexity_factors":["Serial-number-specific applicability: the AD applies only to listed models and specific serial-number ranges, requiring careful checking of individual aircraft (Applicability section).","Cross-reference to external technical documents: compliance depends on following either Piper SB No. 575 or FAA AD 77-24-01, which the AD does not reproduce (Document section).","A short, fixed compliance window expressed relative to a past date and flight-time metric (100 hours time in service after 1 June 1978), which may require operators to interpret whether prior work satisfies the requirement (Compliance section).","No alternative compliance pathways or exemptions are set out in this text; implementers must follow the prescribed documents or seek separate approvals (Document section)."],"plain_english_summary":"This AD mandates inspection of the horizontal stabiliser and vertical fin stringer attach rivets on specified Piper PA‑31, PA‑31‑325 and PA‑31‑350 aircraft, to be carried out per Piper Service Bulletin No. 575 or FAA AD 77‑24‑01. It affects owners/operators and maintenance organisations of the listed serial numbers and must be completed unless already done within 100 hours TIS after 1 June 1978."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection","history":"/api/acts/ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection/history","analysis":"/api/acts/ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection/analysis","conflicts":"/api/acts/ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection/important-cases","documents":"/api/acts/ad-pa-31-59-amdt-1-horizontal-stabiliser-and-vertical-fin-stringer-attach-rivets-inspection/documents"}}