{"id":"F2006B05646","name":"AD/PA-28/91 Amdt 1 - Main Landing Gear Side Brace Stud","slug":"ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135331,"registerId":"commonwealth-F2006B05646-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Model Serial Numbers","sectionType":"part","heading":"Model Serial Numbers","content":"# Model Serial Numbers\n\nPA28R-180 28R-30002 through 28R-31135, and 28R-7130001\n\nthrough 28R-7130013\n\nPA28R-200 28R-35001 through 28R-35820, and 28R-7135001\n\nthrough 28R-7635539\n\nPA28R-201 28R-7737002 through 28R-7737096\n\nPA28R-201T 28R-7703001 through 28R-7703239\n\nRequirement: Remove both the left and right main gear side brace studs from the aircraft in accordance with the instructions contained in the Landing Gear section of the maintenance manual, and inspect each main gear side brace stud for cracks using fluorescent penetrant or magnetic particle inspection methods. Figure 1 of this Directive depicts the area where the sidebrace stud is to be inspected.\n\nThis figure is provided to depict the area of the sidebrace stud to be inspected. This is not intended to represent the configuration of all models affected.\n\nNote 1: A part number 95299-00 or 95299-02 stud installed in an applicable Model PA28R-180, -200, -201, or -201T aircraft may be identified by removing the stud and measuring the shank diameter of the stud. If the shank measures 5/8 inch in diameter, a part number 78717-02 main gear side brace stud is installed.\n\nFor any main gear side brace stud found cracked, replace the cracked stud with an approved serviceable part in accordance with the instructions contained in the Landing Gear section of the applicable maintenance manual.","sortOrder":0},{"sectionNumber":"Piper PA-28 Series Aeroplanes","sectionType":"part","heading":"Piper PA-28 Series Aeroplanes","content":"# Piper PA-28 Series Aeroplanes\n\nAD/PA-28/91 Amdt 1 (continued)\n\nFor the affected Models PA28R-180, \\-200, \\-201, and \\-201T aircraft, the part number 95299-00 or 95299-02 main gear side brace studs are no longer manufactured. A new main gear side brace stud bracket assembly, part number(s) 95643-06, 95643-07, 95643-08, or 95643-09, as applicable, must be installed if cracks are found as a result of the required inspection. No repetitive inspection will be required for these affected aircraft models when this bracket assembly is installed;\n\nor\n\nFor the affected Model PA-28R-180, PA-28R-200, PA-28R-201, and PA-28R-201T aircraft, ream the existing two-piece bushings to an inside diameter of 0.624 inch to 0.625 inch, chamfer the head side of the bushing to accommodate the radius in the shank of the main gear side brace stud, and install the 5/8 inch stud, P/N 78717-02. No repetitive inspections will be required by this Airworthiness Directive when this action is accomplished on both the left and right bracket assemblies. If the bushings cannot be reamed while installed in the bracket (i.e., the bushings are loose), then install a main gear side brace bracket assembly, P/N 95643-06, P/N 95643-07, P/N 95643-08, or P/N 95643-09, as applicable. Models PA-28R-180 with serial numbers 28R-30004 through 28R-31270 and PA-28R-200 with serial numbers 28R-35001 through 28R-35820 and 28R-7135001 through 28R-7135062, may be equipped with a bracket casting identified with casting number 67073-2 or 67073-3 and may require the following modification to P/N 78717-02 for proper installation:\n\n    Reduce the length of the stud to 1.688  0.15 inches;\n    Add additional rolled threads to 1.125  0.015 inches from the flange. Note that the stud is heat treated to 180 to 200 ksi; and\n\n    c. Drill an additional roll pin hole 90 degrees to the existing hole, and approximately 1.480 inches from the flange.\n\nNo repetitive inspections will be required by this Airworthiness Directive when a P/N 78717-02 (or CASA approved equivalent part number) main gear side brace stud is installed in the existing bracket assembly on both the left and right sides; or when a bracket assembly, P/N 95643-06 (or CASA approved equivalent part number), P/N 95643-07 (or CASA approved equivalent part number), P/N 95643-08 (or CASA approved equivalent part number), or P/N 95643-09 (or CASA approved equivalent part number), as applicable, is installed on both the left and right sides.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":true,"description":"The original 1996 directive required repetitive inspections every 500 flight hours indefinitely. Amendment 1 (2002) significantly expanded the scope by adding two permanent 'terminating actions' that end the repetitive inspection requirement: (1) reaming existing bushings and installing stronger studs, and (2) installing new bracket assemblies. It also added specific modification instructions for aircraft with certain casting numbers (67073-2/3), creating a third compliance path. This transformed the directive from an ongoing inspection regime into a 'inspect-until-fixed' directive with multiple permanent repair options."},"complexity_factors":["Multiple overlapping serial number ranges across four aircraft models with gaps and non-sequential numbering","Three distinct compliance paths with conditional logic (replace bracket vs. ream bushings vs. modify stud for specific casting numbers)","Nested exceptions for specific casting numbers (67073-2 or 67073-3) requiring additional dimensional modifications to the replacement stud","Precise engineering tolerances specified (e.g., '1.688 ± 0.15 inches', '0.624 to 0.625 inch', '180 to 200 ksi' hardness)","Cross-reference to FAA AD 97-01-01 R1 Amdt 39-10864 for additional context","Part number identification requires physical measurement (5/8 inch shank diameter) to distinguish between affected and non-affected studs","Conditional termination of repetitive inspection requirements based on which repair option is selected","Specific manufacturing status notes (parts 'no longer manufactured') affecting compliance choices"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and repair of the side‑brace studs on certain Piper PA‑28 “Arrow” retractable‑gear aircraft after reports of stud cracking and seven landing‑gear collapses. It requires removal and non‑destructive testing of the studs, with cracked parts replaced or repaired.\n\nThe 2002 amendment adds an approved alternative: ream existing bushings and fit a stronger 5/8‑inch stud instead of replacing the entire bracket assembly, ending the repetitive inspections once done."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Amendment 1 expands acceptable corrective options by adding an alternative terminating action: reaming existing two‑piece bushings and fitting a 5/8\" stud (P/N 78717‑02). It also provides specific modification steps for certain bracket castings (67073‑2/3). The original compliance intervals remain unchanged; the amendment therefore broadens repair pathways and clarifies when repetitive inspections are no longer required."},"complexity_factors":["Multiple affected model and serial‑number ranges require careful applicability checks.","Technical inspection methods mandated (fluorescent penetrant or magnetic particle) increase maintenance skill and equipment needs.","Alternative terminating actions (install P/N 95643‑06/07/08/09 bracket assembly OR ream two‑piece bushings and install P/N 78717‑02 stud) create compliance choice and verification complexity.","Identification of parts may require removal and measurement (shank diameter measurement to distinguish P/Ns 95299‑00/95299‑02 from P/N 78717‑02).","Specific modification instructions for certain bracket castings (casting numbers 67073‑2 or 67073‑3) require stud length reduction, added rolled threads and drilling an extra roll‑pin hole.","Some original parts (95299‑00/95299‑02) are no longer manufactured, forcing use of retrofit assemblies or approved equivalent parts (CASA approval language).","Compliance timing: initial action within 100 hours after 4 Jan 1996 and recurrent inspections every 500 hours creates ongoing maintenance scheduling and record‑keeping obligations.","Cross‑reference to FAA AD 97‑01‑01 R1 and requirement for CASA‑approved equivalent parts introduces multi‑jurisdictional regulatory compliance considerations."],"plain_english_summary":"This directive requires removal and non‑destructive inspection (fluorescent‑penetrant or magnetic‑particle) of both left and right main landing‑gear side‑brace studs on listed Piper PA‑28R models and serial numbers. Cracked studs must be replaced or the specified retrofit installed.\n\nIt affects aircraft owners, operators and maintenance organisations; inspections are due within 100 hours and then every 500 hours to reduce risk of main‑gear collapse. Amendment 1 allows either fitting new bracket assemblies (P/Ns 95643‑06/07/08/09) or reaming bushings and installing a 5/8\" stud (P/N 78717‑02) to terminate repetitive inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud","history":"/api/acts/ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud/history","analysis":"/api/acts/ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud/analysis","conflicts":"/api/acts/ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud/conflicts","importantCases":"/api/acts/ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud/important-cases","documents":"/api/acts/ad-pa-28-91-amdt-1-main-landing-gear-side-brace-stud/documents"}}