{"id":"F2006B05954","name":"AD/PA-38/16 Amdt 1 - Main Landing Gear Attach Bolts - Modification","slug":"ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136112,"registerId":"commonwealth-F2006B05954-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-38/16 Amdt 1 - Main Landing Gear Attach Bolts - 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-38 (Tomahawk) Series Aeroplanes\n\n \n\nAD/PA-38/16\n\nAmdt 1\n\n\nMain Landing Gear Attach Bolts - Modification 9/83\n\n \n\nApplicability: All model PA-38-112 with S/Nos. 38-78A0001 to 38-82A0110. Document:  Piper SB No. 673A.\n\nCompliance: Unless already accomplished within 100 hours time in service after 31 December, 1982.\n\n \n\nNote: Aircraft which have complied with SB673 are required to comply with SB.673A.\n\n \n\nBackground: Amdt 1 to AD/PA-38/16 is reissued to avoid possible ambiguity. Piper SB673 is superseded by SB673A. As it extends serial number effectivity, introduces new improved high tensile bolts and provides proper installation and torqueing procedures.\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":{"summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"Extends the serial number effectivity from the original directive and replaces the required service bulletin with Piper SB 673A, expanding the population of aircraft that must comply."},"complexity_factors":["Prescriptive compliance deadline (100 hours TIS after 31 December 1982)","Specific aircraft serial number range","Supersedes earlier service bulletin","Amendment clarifies existing requirement"],"plain_english_summary":"This amendment reissues AD/PA-38/16 to require replacement of the main landing‑gear attach bolts on specified Piper PA‑38‑112 (Tomahawk) aeroplanes with the improved high‑tensile bolts and correct installation/torque per Piper Service Bulletin No. 673A. It expands the serial‑number range, clarifies requirements (even where SB 673 was previously used), and remains a continuing airworthiness obligation; compliance is required within 100 hours TIS after 31 Dec 1982 unless already accomplished. Non‑compliance may affect airworthiness certification."},"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1809},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment expands the scope compared to the original AD/PA-38/16 by extending the serial number effectivity to cover additional aircraft. It also updates the technical requirements by superseding Service Bulletin 673 with SB 673A, which introduces new improved high-tensile bolts and proper installation/torqueing procedures."},"complexity_factors":["Very narrow applicability limited to specific aircraft model and serial number range","Single, unambiguous compliance action (bolt replacement per specified service bulletin)","Simple deadline structure (100 hours time in service after fixed date)","No conditional exceptions, nested logic, or cross-references to other legislative instruments"],"plain_english_summary":"**What this is:** A mandatory safety directive (Airworthiness Directive) requiring owners of specific Piper Tomahawk aircraft to upgrade the bolts that attach the main landing gear to the airframe.\n\n**Who it affects:** Owners and operators of Piper PA-38-112 model aircraft with serial numbers from 38-78A0001 to 38-82A0110.\n\n**What you must do:** Modify or replace the main landing gear attach bolts in accordance with Piper Service Bulletin No. 673A. This work must be completed within 100 hours of flight time after 31 December 1982, unless already done.\n\n**Why it matters:** The original bolts may be prone to failure. This directive mandates improved high-tensile strength bolts with specific installation and torque procedures to prevent the landing gear from detaching, which could cause a serious accident during takeoff or landing.\n\n**Important note:** Even if you previously complied with the older Service Bulletin 673, you must now comply with the updated SB 673A."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification","history":"/api/acts/ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification/history","analysis":"/api/acts/ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification/analysis","conflicts":"/api/acts/ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification/conflicts","importantCases":"/api/acts/ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification/important-cases","documents":"/api/acts/ad-pa-38-16-amdt-1-main-landing-gear-attach-bolts-modification/documents"}}