{"id":"F2006B04063","name":"AD/BEECH 56/31 Amdt 2 - Wing Bolt, Nut and Fitting","slug":"ad-beech-56-31-amdt-2-wing-bolt-nut-and-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43695,"registerId":"commonwealth-F2006B04063-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 56/31 Amdt 2 - Wing Bolt, Nut and Fitting","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BEECH 56/31 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nBeechcraft 56TC (Turbo Baron) Series Aeroplanes\n\nAD/BEECH 56/31\n\nAmdt 2\n\n  \nWing Bolt, Nut and Fitting 2/2002\n\nApplicability: All models.\n\nRequirement: 1. Remove and inspect the wing bolts, washers, nuts and fittings in accordance with Beechcraft Turbo-Baron Shop Manual 96-590003-5B5 as revised August 1995, Section 3.\n\n2. Retire wing bolts, washers and nuts from service and replace with new hardware in accordance with Beechcraft Turbo-Baron Shop Manual 96-590003-5B5 Section 3. Render unserviceable all hardware retired.\n\nNote: The bolt torque should be checked before replacement to confirm bolt has been torqued to correct value. If the torque value is incorrect, other maintenance action may be required.\n\nCompliance: 1. Unless inspection has already been accomplished in accordance with the Requirement Document, initially inspect before 5 calendar years from initial installation. Re-inspect at intervals not to exceed 5 calendar years.\n\n2. Retire before 15 calendar years after initial installation.\n\nThis amendment becomes effective on 21 February 2002.\n\nBackground: 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.\n\nAmdt 1 - This Amendment updates the revision status of the beech Turbo Baron Shop Manual\n\nBeechcraft 56TC (Turbo Baron) Series Aeroplanes\n\nAD/BEECH 56/31 Amdt 2 (continued)\n\nAmdt 2 - Adds the Note to Requirement 2 and the fittings as an item to be inspected when the wing bolts, washers and nuts are removed and inspected.\n\n![](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 3 January 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 30 January 2002.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — safety maintenance of wing attachment hardware on a specific aircraft model. Amendment 2 makes minor technical additions (torque check note and fittings inspection) but does not expand beyond the original airworthiness purpose."},"complexity_factors":["Short, single-purpose instrument (2 pages) with clear mechanical instructions","Only 4 defined structural elements (wing bolts, washers, nuts, fittings)","Simple temporal compliance structure (5-year inspection intervals, 15-year hard retirement)","Single external reference to manufacturer manual (Beechcraft Turbo-Baron Shop Manual)","Minimal conditional logic — only one exception noted ('Unless inspection has already been accomplished')","No nested definitions or cross-references to other legislation"],"plain_english_summary":"This AD requires Australian-registered Beechcraft 56TC (Turbo Baron) aircraft to have wing attachment hardware inspected regularly (every 5 years) and all bolts, washers and nuts replaced and retired after 15 years, with bolt torque verified. It adds a mandatory check of the fittings and a torque-note to the previous requirement, preventing wing attachment failures."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 2 does not significantly expand the AD beyond its original safety purpose. The initial AD (1996) already imposed inspection and replacement/retirement periods for wing attachment hardware. Amdt 1 updated the referenced manual revision; Amdt 2 adds the fittings explicitly to the list of items to inspect and inserts a note to check bolt torque before replacement. Those are clarifying and modestly broadening changes to the items inspected and a procedural check, but they do not change the AD’s fundamental scope or introduce new regulatory powers."},"complexity_factors":["Short, prescriptive instrument: two primary requirements and two compliance rules (simple structure).","Cross‑reference to Beechcraft Turbo‑Baron Shop Manual 96‑590003‑5B5 Section 3 — external normative document required for execution (increases operational complexity).","Time‑based compliance obligations (initial inspection within 5 calendar years, recurring 5‑year intervals, 15‑year retirement) require recordkeeping and date calculations.","A conditional note (check bolt torque; if incorrect, additional maintenance may be required) creates potential variability in scope of work per aircraft.","Amendment history: Amdt 2 adds fittings to inspection list and a note; Amdt 1 updated manual revision — minor cross‑version tracing required for compliance assurance.","Reference to regulatory power (subreg 39.1(1) of CAR 1998) creates legal enforcement context but no additional procedural layers within the AD itself."],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Applies to: all Beechcraft 56TC (Turbo Baron) series aeroplanes (Applicability: All models).\n- Requires removal and inspection of the wing attachment hardware — specifically the wing bolts, washers, nuts and the fittings they attach to — using the procedures in the Beechcraft Turbo‑Baron Shop Manual 96‑590003‑5B5, Section 3 (Requirement 1).\n- Requires that wing bolts, washers and nuts that are retired from service be replaced with new hardware following the same shop manual and that any retired hardware be rendered unserviceable (Requirement 2).\n- Includes a maintenance note: check the bolt torque before replacement; if torque is incorrect, additional maintenance action may be needed (Note to Requirement 2).\n- Sets timing: an initial inspection must be done within 5 calendar years of initial installation (unless already done), and inspections must be repeated at intervals not exceeding 5 calendar years (Compliance 1). Bolts, washers and nuts must be retired from service before 15 calendar years after initial installation (Compliance 2).\n\n**Why the regulator says this is required**\n\n- The AD’s background states that the directive enforces inspection and retirement periods for wing attachment hardware to correct an unsafe condition. Amendment 2 specifically adds the fittings to the list of items to be inspected and adds the torque check note.\n\n**Who is directly affected and who pays**\n\n- Aircraft owners and operators of Beechcraft 56TC Turbo Baron aeroplanes are directly responsible for complying. Maintenance organisations or individual mechanics carrying out the work are operationally affected.\n- The owner/operator bears the direct costs: inspection labour, possible additional maintenance if torque is outside limits, and the cost of replacement hardware purchased and installed. There will also be aircraft downtime while work is performed.\n\n**How it changes behaviour and decisions**\n\n- Operators must keep records of installation dates for the wing bolts, washers and nuts to calculate the 5‑year inspection and 15‑year retirement deadlines (Compliance 1 and 2).\n- Maintenance providers must follow the specified shop manual procedures (cross‑reference to Beechcraft Turbo‑Baron Shop Manual 96‑590003‑5B5, Section 3) when performing the inspections and replacements.\n- If bolt torque is found incorrect at inspection, mechanics may have to perform additional corrective maintenance beyond mere replacement (Note to Requirement 2).\n\n**Trade‑offs, costs and implementation issues**\n\n- Cost and downtime: Periodic inspections every 5 years and mandatory retirement at 15 years create predictable recurring costs and aircraft unavailability for owners/operators.\n- Parts availability and supply: The requirement to replace retired hardware with new certified parts can create short‑term cost pressure or lead times if parts are scarce; this affects independent maintenance operators and small owners more than large fleets.\n- Administrative burden: Operators must track installation dates and inspection history for each affected component to demonstrate compliance.\n- Scope of required work: The AD delegates the exact inspection and replacement method to the Beechcraft shop manual. That reduces ambiguity but transfers reliance to the manufacturer’s procedures (Requirement 1 and 2). Different maintenance organisations may interpret or implement those procedures with slight operational variation, but the AD requires compliance with the manual’s instructions.\n- Enforcement and discretion: The AD is issued under subregulation 39.1(1) of the Civil Aviation Regulations 1998, so non‑compliance is a regulatory breach; CASA (through its delegate) prescribes the action and timing.\n\n**Concentrated benefits and diffuse costs**\n\n- The safety benefit, as stated by the AD, accrues to aircraft occupants and the wider aviation system if wing attachment failures are prevented. Those benefits are diffuse relative to the concentrated costs borne by individual owners/operators required to replace hardware and perform inspections.\n\n**Bottom line**\n\n- Mechanically, the instrument mandates periodic inspection every 5 years and mandatory retirement of certain wing attachment hardware by 15 years, using the manufacturer’s shop manual procedures; it adds fittings to the inspection list and requires a torque check. Owners/operators must budget for inspections, possible corrective work, parts replacement and downtime, and must keep installation records to meet the stated compliance dates (Requirement 1–2; Compliance 1–2)."},"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-56-31-amdt-2-wing-bolt-nut-and-fitting","history":"/api/acts/ad-beech-56-31-amdt-2-wing-bolt-nut-and-fitting/history","analysis":"/api/acts/ad-beech-56-31-amdt-2-wing-bolt-nut-and-fitting/analysis","conflicts":"/api/acts/ad-beech-56-31-amdt-2-wing-bolt-nut-and-fitting/conflicts","importantCases":"/api/acts/ad-beech-56-31-amdt-2-wing-bolt-nut-and-fitting/important-cases","documents":"/api/acts/ad-beech-56-31-amdt-2-wing-bolt-nut-and-fitting/documents"}}