{"id":"F2006B04946","name":"AD/CESSNA 150/48 - Upper Shoulder Harness Adjuster Spring","slug":"ad-cessna-150-48-upper-shoulder-harness-adjuster-spring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44806,"registerId":"commonwealth-F2006B04946-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/48 - Upper Shoulder Harness Adjuster Spring","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 issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 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\nCessna 150, F150, 152 & F152 Series Aeroplanes\n\nAD/CESSNA 150/48 Upper Shoulder Harness\n\nAdjuster Spring\n\n  \n13/2004\n\nApplicability: Models 150, 150A, 150B, 150C, 150D, 150E, 150F, 150G, 150H, 150J, and 150K\n\naircraft, with serial numbers listed in Cessna Single Engine Service Bulletin (SB) SEB86-8 Revision 1, dated 28 July 2003.\n\n    Inspect only the upper shoulder harness adjuster (part number 443030-401) for the presence of a retainer spring, in accordance with SB SEB86-8 Revision 1.\n\nIf a retainer spring is found during the above inspection of the upper shoulder harness adjuster (part number 443030-401), before further flight, remove the spring by cutting each side, and stamp out the -401 identification number; in accordance with SB SEB86-8 Revision 1.\n\nIf a retainer spring is not found during the above inspection of the upper shoulder harness adjuster (part number 443030-401), before further flight, make an entry in the aircraft log book showing compliance with this Directive.\n\n    2. Only incorporate Cessna Accessory Kits that have been identified, inspected, and modified in accordance with the Requirement document.\n\nNote: FAA AD 2004-19-01 Amdt 39-13795.\n\nCompliance: 1. Within the next 25 hours time in service or at the next annual inspection after 23 December 2004, whichever occurs first.\n\n2. As of the effective date of this Directive.\n\nNote: Compliance with SB SEB86-8 original issue, dated 21 November 1986, constitutes terminating action for the requirements of this Directive, if shoulder harness adjuster part number 443030-401 was used.\n\nThis Airworthiness Directive becomes effective on 23 December 2004.\n\nCessna 150, F150, 152 & F152 Series Aeroplanes\n\nAD/CESSNA 150/48 (continued)\n\nBackground: The manufacturer determined that some of the shoulder harness belt adjusters included in the affected shoulder harness accessory kits may have had a small wire spring inadvertently installed on the belt friction pin. The actions required by this Directive are intended to prevent slippage of the pilot/co-pilot shoulder harness, which could result in failure of the shoulder harness to maintain proper belt length adjustment and tension.\n\n![](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 10 November 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 1 December 2004.","sortOrder":0}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive imposes a targeted corrective measure limited to the Cessna models/serials listed in the cited service bulletin and the specific adjuster part; it does not expand applicability beyond that list and includes a terminating action if the original SB was complied with, so its scope remains aligned with the stated safety purpose."},"complexity_factors":["Narrow applicability tied to specific model range and serial numbers listed in an external Cessna Service Bulletin (SB SEB86-8 Rev 1)","Single, precisely identified part number (443030-401) required for inspection and possible modification","Simple binary compliance path: inspect → either remove and deface the spring or enter a logbook record","Short, specific compliance timeframe (within 25 flight hours or next annual inspection) plus an ongoing restriction on kit incorporation","Reference to an external Requirement document and FAA AD for methods and terminating action (cross-references increase procedural dependence on other materials)","Administrative impact on maintenance practices and records (logbook entries, stamping of parts)","Delegated regulatory instrument issued under CASR subregulation 39.1(1) (administrative discretion in issuance)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Cessna 150/152 series (serial numbers listed in Cessna SB SEB86‑8 Rev 1) to inspect the upper shoulder-harness adjuster (part 443030‑401) for a small retainer spring and, if found, cut it off and deface the part; if not found, record compliance in the aircraft log. It also bars fitting accessory kits unless they have been inspected/modified as required. The measure aims to prevent shoulder-harness slippage; costs (inspection, minor modification and logkeeping) fall to owners/operators, with compliance due within 25 flight hours or at the next annual inspection."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific manufacturing defect in a single component (shoulder harness adjuster spring) for a defined aircraft series. The document references an earlier 1986 service bulletin as terminating action, showing the issue has been tracked consistently over time without scope creep."},"complexity_factors":["Single, specific mechanical issue (one part, one problem)","Clear binary decision tree (spring present vs. absent)","Only 2 possible actions depending on inspection outcome","Minimal cross-referencing (only to one Cessna Service Bulletin and one FAA AD)","Straightforward applicability criteria (specific models and serial numbers)","Single compliance timeframe with simple 'whichever occurs first' logic","No nested exceptions or conditional sub-clauses"],"plain_english_summary":"This CASA safety order requires owners/operators of specified Cessna 150 series aircraft (see Cessna service bulletin serial list) to inspect the upper shoulder-harness adjuster for an unauthorized wire spring. If the spring is present it must be cut out and the part number stamped out before flight; if absent, record the inspection in the logbook.\n\nCompliance is due within 25 flight hours or by the next annual inspection after 23 December 2004. The spring can let the harness slip, increasing injury risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-48-upper-shoulder-harness-adjuster-spring","history":"/api/acts/ad-cessna-150-48-upper-shoulder-harness-adjuster-spring/history","analysis":"/api/acts/ad-cessna-150-48-upper-shoulder-harness-adjuster-spring/analysis","conflicts":"/api/acts/ad-cessna-150-48-upper-shoulder-harness-adjuster-spring/conflicts","importantCases":"/api/acts/ad-cessna-150-48-upper-shoulder-harness-adjuster-spring/important-cases","documents":"/api/acts/ad-cessna-150-48-upper-shoulder-harness-adjuster-spring/documents"}}