{"id":"F2006B03763","name":"AD/BEECH 23/8 - Flight Instruments Static System","slug":"ad-beech-23-8-flight-instruments-static-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43359,"registerId":"commonwealth-F2006B03763-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 23/8 - Flight Instruments Static System","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)  Beechcraft 19, 23 and 24 Series Aeroplanes\n\n \n\nAD/BEECH 23/8 Flight Instruments Static System 7/65\n\nApplicability: Model 23 with S/Nos. M-1 to M-334 except M-62. Requirement:  Action in accordance with Beechcraft SB Model 23 No. 7. Compliance:               Before 30 September 1971.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD as shown specifies a narrow scope limited to Beechcraft Model 23 serial numbers M-1 to M-334 excluding M-62, requires action in accordance with Beechcraft SB Model 23 No. 7, and sets a compliance deadline. The text provides no indication that the AD’s scope has been expanded or narrowed from an earlier or original instrument; based on the document itself, the scope remains the specific serial‑number population and the SB‑based remedy described."},"complexity_factors":["Reliance on an external document (Beechcraft SB Model 23 No. 7) for mandatory technical steps rather than containing those steps in the AD itself","Serial-number‑limited applicability (M-1 to M-334 except M-62) requiring accurate asset identification by owners/operators","Dated compliance deadline (before 30 September 1971) — retrospective compliance timing introduces administrative closure considerations","Minimal textual detail in the AD about the technical issue or the required corrective actions, raising implementation ambiguity without consulting the SB","Regulatory delegation: the AD enforces a manufacturer’s instruction, creating coordination needs between the regulator, manufacturer, maintenance organisations and aircraft owners"],"plain_english_summary":"What this instrument does\n\n- This is an Airworthiness Directive (AD) titled \"AD/BEECH 23/8 — Flight Instruments Static System\" issued under the Commonwealth of Australia (Civil Aviation Regulations 1998), Part 39 (Schedule of Airworthiness Directives). (header)\n- It requires owners/operators of certain Beechcraft Model 23 aeroplanes to carry out work specified by the aircraft manufacturer. The AD does not itself list technical steps; it directs compliance with \"Beechcraft SB Model 23 No. 7.\" (Requirement)\n\nWho is affected\n\n- The AD applies only to Beechcraft Model 23 aeroplanes with serial numbers M-1 to M-334, except M-62. Aircraft outside that serial-number range are not covered by this AD. (Applicability)\n\nWhat the affected parties must do\n\n- Owners/operators must take the actions set out in Beechcraft Service Bulletin (SB) Model 23 No. 7. The AD makes following that SB mandatory for the listed aircraft. (Requirement)\n- Those actions had to be completed by the date shown: before 30 September 1971. The AD imposes a compliance deadline. (Compliance)\n\nWho pays and who decides\n\n- The immediate financial burden falls on the owners/operators of the affected aircraft, who must pay for the work, spare parts, and labour required by the Beechcraft service bulletin. (Applicability; Requirement)\n- The regulator (the Civil Aviation Safety Authority acting through this AD) decides that the SB must be complied with; the detailed technical steps and standards are those contained in Beechcraft SB Model 23 No. 7, which is issued by the manufacturer. (header; Requirement)\n\nHow it changes behaviour and choices\n\n- Affected aircraft must be inspected, modified, or repaired as specified in the manufacturer’s SB. That will change maintenance scheduling and may take aircraft out of service while work is done. (Requirement; Compliance)\n- Maintenance organisations and parts suppliers will be the contractors who actually implement the work required by the SB; they decide how to meet the SB requirements in practice (subject to regulatory and industry standards). (Requirement)\n\nImplementation mechanics and risks\n\n- The AD delegates technical detail to the manufacturer’s SB rather than setting out the steps itself. This creates reliance on an external document for the mandatory action. (Requirement)\n- The AD establishes a fixed deadline for compliance; failure to have completed the SB work by that date would mean non‑compliance with the AD. (Compliance)\n- The text does not state the technical problem or the reason for the SB; the title indicates the subject matter is the flight instruments’ static system, but the AD itself does not record the operational or safety justification. (header; Requirement)\n\nCosts, incentives and trade‑offs (source‑grounded)\n\n- Direct costs: owners/operators pay for parts, labour and any downtime required to implement the SB. (Applicability; Requirement)\n- Concentrated benefits: if the SB addresses a technical issue, the most immediate benefit accrues to the specific aircraft owners who receive the corrective work; the AD does not create a broad subsidy or offset. (Applicability; Requirement)\n- Administrative trade‑off: the regulator enforces a manufacturer’s remedy (the SB) rather than promulgating its own technical procedure; this reduces drafting detail in the AD but increases dependence on the SB as the operative document. (Requirement)\n\nScope and legal effect\n\n- The AD is binding on operators of the specifically identified serial numbers and makes compliance with the manufacturer’s SB compulsory for them. It does not apply to other models or serial numbers. (Applicability)\n\nCitation references from the instrument\n\n- Header: AD/BEECH 23/8 Flight Instruments Static System 7/65 (header)\n- Applicability: \"Model 23 with S/Nos. M-1 to M-334 except M-62.\" (Applicability)\n- Requirement: \"Action in accordance with Beechcraft SB Model 23 No. 7.\" (Requirement)\n- Compliance: \"Before 30 September 1971.\" (Compliance)\n\nSummary assessment\n\n- Mechanically, the AD compels a defined set of Beechcraft Model 23 aircraft to undergo work as set out in Beechcraft SB Model 23 No. 7 by a fixed date. The regulator prescribes the requirement; the manufacturer supplies the technical instructions; owners/operators bear the cost and operational consequences of implementing the SB."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1965 with a 1971 compliance deadline. It has not expanded beyond its original narrow purpose of addressing a specific static system issue in specific aircraft serial numbers."},"complexity_factors":["Very short document (under 150 words)","Only 4 defined elements: applicability (specific serial numbers), requirement (reference to external service bulletin), compliance date, and subject matter","No nested conditional logic or exceptions to exceptions","Single external cross-reference (to Beechcraft Service Bulletin No. 7)","No interpretation section or defined terms","Straightforward command structure: 'do X by Y date'"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Beechcraft Model 23 aeroplanes** (light aircraft) with serial numbers M-1 through M-334, except serial number M-62.\n\n**What it requires:**\n- Aircraft owners/operators must follow the instructions in **Beechcraft Service Bulletin No. 7** for the Model 23\n- This service bulletin relates to the **flight instruments static system** — the part of an aircraft that provides air pressure readings for instruments like the altimeter, airspeed indicator, and vertical speed indicator\n\n**Why it matters:**\n- Faulty static systems can give pilots incorrect altitude or speed readings, which is extremely dangerous\n- This AD was issued to prevent accidents caused by static system failures\n\n**Deadline:**\n- Compliance was required **before 30 September 1971**\n\n**Who it affects:**\n- Owners and operators of the specified Beechcraft aircraft\n- Maintenance organisations servicing these aircraft"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-23-8-flight-instruments-static-system","history":"/api/acts/ad-beech-23-8-flight-instruments-static-system/history","analysis":"/api/acts/ad-beech-23-8-flight-instruments-static-system/analysis","conflicts":"/api/acts/ad-beech-23-8-flight-instruments-static-system/conflicts","importantCases":"/api/acts/ad-beech-23-8-flight-instruments-static-system/important-cases","documents":"/api/acts/ad-beech-23-8-flight-instruments-static-system/documents"}}