{"id":"F2006B05645","name":"AD/PA-28/90 - Nose Gear Drag Link","slug":"ad-pa-28-90-nose-gear-drag-link","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135329,"registerId":"commonwealth-F2006B05645-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/90 - Nose Gear Drag Link","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-28 Series Aeroplanes\n\nAD/PA-28/90 Nose Gear Drag Link 10/94\n\nApplicability: Model Serial Numbers\n\nPA28R-180 28R-30004 through 28R-7130013\n\nPA28R-200 28R-35001 through 28R-7635545\n\nPA28R-201 28R-7737001 through 28R-7837317\n\nPA28R-201T 28R-7703001 through 28R-7803373\n\nPA28RT-201 28R-7918001 through 28R-8218003\n\nPA28RT-201T 28R-7931001 through 28R-8231009\n\nRequirement: Incorporate Nose Landing Gear Modification Kit, Piper Part No. 764-377.\n\nAccomplish this action in accordance with the procedures and sketches included with the instructions to the above referenced kit.\n\nNote 1: The modification kit referenced above consists of a close tolerance bolt (NAS464P4-27), four bearings, and other associated hardware for installation on the drag link assembly. This NAS464P4-27 bolt replaces the AN4-20 bolt used to connect the upper and lower drag links.\n\nNote 2: FAA AD 94-14-14 Amdt 39-8962 and Piper Service Letter 988 refer.\n\nCompliance: Within 100 hours time in service after 15 September 1994.\n\nBackground: The FAA received reports of collapsed nosegear on the affected aircraft. In particular, these reports reveal failure of the bolt (AN4-20) connecting the lower drag link of the nosegear to the upper drag link.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical failure mode in specific aircraft. It has not expanded beyond its original purpose of mandating a nose gear modification."},"complexity_factors":["Single, specific mechanical action required (replace bolt with kit)","Only 6 aircraft model variants affected with clearly listed serial number ranges","No conditional logic or alternative compliance methods","No cross-references to other legislation sections (only references to FAA AD and manufacturer service letter for information)","Simple compliance deadline (100 hours after fixed date)","Minimal defined terms (only standard aviation abbreviations like NAS and AN bolt specifications)"],"plain_english_summary":"This FAA safety order mandates owners/operators of certain Piper PA‑28R/RT Cherokee Arrow models (specific serial numbers) replace a failing nose‑gear bolt (AN4‑20) with Piper modification kit 764‑377. The bolt’s failure has caused nose‑gear collapses during taxi/landing, risking damage and injury. Compliance is mandatory within 100 flight hours after 15 September 1994."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope stays limited to the listed PA‑28R serial‑number ranges and requires a specific kit installation to address reported AN4‑20 bolt failures. It does not expand obligations beyond that retrofit or add unrelated requirements."},"complexity_factors":["Narrow applicability: specific PA‑28R model serial‑number ranges only (Applicability).","Mandated retrofit using a named parts kit (Piper Part No. 764‑377) — operators must obtain that kit (Requirement).","Technical change: replacement of AN4‑20 bolt with NAS464P4‑27 and installation of bearings (Note 1) — requires mechanical alteration per the kit procedures (Requirement).","Fixed compliance deadline: within 100 hours time in service after 15 September 1994 (Compliance) — scheduling and tracking burden on operators.","Cross‑references to external guidance (FAA AD 94‑14‑14 and Piper Service Letter 988) mean implementers may need to consult multiple documents to confirm actions (Note 2).","Safety rationale tied to reported collapses from bolt failure (Background) — remedial, single‑issue focus reduces legal breadth but concentrates operational impact on affected fleet."],"plain_english_summary":"**Requires** owners/operators of listed Piper PA‑28R serial-number aircraft to install Piper Part No. 764‑377 nose‑gear drag‑link modification kit (replacing the AN4‑20 bolt with NAS464P4‑27 and fitting bearings) per the kit instructions. Compliance is within 100 hours' time in service after 15 September 1994. The AD responds to reported nosegear collapses caused by AN4‑20 bolt failures and places the cost and work of the retrofit on the aircraft operator."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-90-nose-gear-drag-link","history":"/api/acts/ad-pa-28-90-nose-gear-drag-link/history","analysis":"/api/acts/ad-pa-28-90-nose-gear-drag-link/analysis","conflicts":"/api/acts/ad-pa-28-90-nose-gear-drag-link/conflicts","importantCases":"/api/acts/ad-pa-28-90-nose-gear-drag-link/important-cases","documents":"/api/acts/ad-pa-28-90-nose-gear-drag-link/documents"}}