{"id":"F2022L00686","name":"AD/BEECH 55/79 Amdt 4 Wing Bolt, Nut and Fitting","slug":"ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":102433,"registerId":"commonwealth-F2022L00686-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Textron Aviation (Beechcraft) 55, 58 and","sectionType":"part","heading":"Textron Aviation (Beechcraft) 55, 58 and 95-55 (Baron) Series Aeroplanes","content":"# Textron Aviation (Beechcraft) 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n| AD/BEECH 55/79 Amdt 4 | Wing Bolt, Nut and Fitting | 10/2022 |\n| --------------------- | -------------------------- | ------- |\n\n| Applicability: | All models of Textron Aviation (Beechcraft) 55, 58 and 95-55 series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Remove and inspect the wing bolts, washers, nuts and fittings in accordance with Beechcraft Baron Shop Manual 55-590000-13 Revision E17, Section 3, for model 55 and 58 series; or Baron Maintenance Manual 102- 590000-5 Revision A23, Section 57-00-00, for model 58P and TC series, both as in force on the date of commencement of this AD.2. Retire wing bolts, washers and nuts from service and replace with new hardware in accordance with Beechcraft Baron Shop Manual 55-590000-13 Revision E17 Section 3 or Baron Maintenance Manual 102-590000-5 Revision A23 Section 57-00-00 as applicable, both as in force on the date of commencement of this AD. Render unserviceable all hardware retired.Note 1: The bolt torque should be checked before removal for inspection or replacement to confirm the bolt has been torqued to correct value. If the torque value is incorrect, other maintenance action may be required. |\n| Compliance:    | 1. a. Unless inspection has already been accomplished in accordance with either of the requirement documents within 60 months from the initial installation of the wing bolts, inspect within 100 hours time in service (TIS) or two months from the commencement date of this AD, whichever occurs first.b. Re-inspect at intervals not to exceed 60 months from the previous inspection.2. Before 15 years (180 months) TIS after initial installation of the wing bolts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | This AD commences on 10 May 2022.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Background:    | The initial issue of this Airworthiness Directive became effective on 1 February 1996 and made mandatory the inspection and replacement periods for the wing attachment hardware as detailed in the requirement document.Amendment 1 of this AD updated the revision status of the Beech 55 Shop Manual.Amendment 2 of this AD added the Note to Requirement 2 and added the fittings as an item to be inspected when the wing bolts, washers and nuts are removed and inspected.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n\n|     | Amendment 3 removed the alternative means of compliance that had been issued to allow in-situ inspection of the wing attachment bolts and nuts rather than conduct the manufacturer’s required MPI.Amendment 4 is issued to provide relief to compliance with Requirement 1 whilst the proposed airworthiness directive process occurs for a technical change to the airworthiness directive. |\n| --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![Delegate signature](image.001.jpeg)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n6 May 2022","sortOrder":0},{"sectionNumber":"AD/BEECH 55/79 Amdt 4","sectionType":"part","heading":"AD/BEECH 55/79 Amdt 4","content":"## AD/BEECH 55/79 Amdt 4","sortOrder":1},{"sectionNumber":"Wing Bolt, Nut and Fitting","sectionType":"part","heading":"Wing Bolt, Nut and Fitting","content":"## Wing Bolt, Nut and Fitting","sortOrder":2},{"sectionNumber":"10/2022","sectionType":"part","heading":"10/2022","content":"## 10/2022","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original scope focused on wing attachment hardware safety for specific Beechcraft Baron series aircraft. Amendment 4 is a temporary procedural relief measure that does not expand the substantive scope; it merely adjusts compliance timing while technical revisions are processed. The core safety mandate (inspect and replace wing bolts) remains unchanged from the 1996 original."},"complexity_factors":["Multiple document references requiring cross-checking (two different maintenance manuals depending on aircraft model)","Conditional compliance timing with multiple triggers (100 hours TIS vs 2 months vs 60 months since last inspection)","Nested applicability (different manual sections for different aircraft sub-models)","Amendment history creates contextual dependency (understanding Amendment 4 requires knowing what Requirement 1 was)","Technical aviation terminology requiring domain knowledge (TIS = Time In Service, MPI = Magnetic Particle Inspection referenced in background)"],"plain_english_summary":"This AD requires owners, operators and maintenance organisations of Textron Aviation Beechcraft 55, 58 and 95-55 series aeroplanes to inspect and ultimately replace wing attachment bolts, nuts, washers and fittings to mitigate fatigue or corrosion that could lead to wing separation. \n\nAmendment 4 temporarily relaxes the inspection requirement while CASA prepares a technical update; replacement remains mandated within 15 years in service."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The original 1996 AD mandated inspection and replacement periods for wing attachment hardware. Subsequent amendments updated manual revision references and removed an in‑situ inspection alternative (Amendment 3). Amendment 4 modifies implementation timing by providing temporary relief from Requirement 1 while a proposed AD process for a technical change proceeds, so the practical compliance obligations and timelines have been altered from the original AD (Background)."},"complexity_factors":["Broad applicability: covers all models of Beechcraft 55, 58 and 95‑55 series aircraft, so it applies across the entire operator base (Applicability).","Multiple, model‑specific requirement documents: compliance must follow either Beechcraft Baron Shop Manual 55‑590000‑13 Revision E17 Section 3 or Baron Maintenance Manual 102‑590000‑5 Revision A23 Section 57‑00‑00, depending on model (Requirement).","Layered timing rules: short initial deadline (inspect within 100 hours TIS or two months unless already done within 60 months of bolt installation), recurring 60‑month re‑inspection intervals, and mandatory retirement before 180 months TIS (Compliance).","Hardware retirement and replacement obligation: removed hardware must be rendered unserviceable and replaced with new parts per the manuals, creating procurement and disposal costs for operators (Requirement).","Technical inspection standard and prior compliance paths: Amendment 3 removed an in‑situ inspection alternative and requires the manufacturer’s MPI procedure, increasing technical inspection complexity (Background).","Regulatory change management: Amendment 4 temporarily relaxes compliance with Requirement 1 while a proposed AD process for a technical change proceeds, creating transitional uncertainty about enforcement timing (Background).","Regulatory delegation: the instrument is signed by a CASA delegate, indicating centralised regulatory decision and potential administrative discretion in AD issuance (Delegate signature)."],"plain_english_summary":"This directive requires owners/operators of Textron (Beechcraft) 55, 58 and 95‑55 (Baron) series aeroplanes to remove and inspect wing attachment bolts, washers, nuts and fittings using specified Beechcraft shop/maintenance manuals, and to retire and replace the hardware by set intervals (including mandatory retirement by 15 years time‑in‑service). It affects every operator of those models and matters because it imposes recurring inspection, replacement and record burdens to maintain wing attachment airworthiness."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting","history":"/api/acts/ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting/history","analysis":"/api/acts/ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting/analysis","conflicts":"/api/acts/ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting/conflicts","importantCases":"/api/acts/ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting/important-cases","documents":"/api/acts/ad-beech-55-79-amdt-4-wing-bolt-nut-and-fitting/documents"}}