{"id":"F2006B05004","name":"AD/CESSNA 170/75 - Upper Shoulder Harness Adjuster Spring","slug":"ad-cessna-170-75-upper-shoulder-harness-adjuster-spring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44914,"registerId":"commonwealth-F2006B05004-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/75 - 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 170, 172, F172, FR172 and 175 Series Aeroplanes\n\nAD/CESSNA 170/75 Upper Shoulder Harness\n\nAdjuster Spring\n\n  \n13/2004\n\nApplicability: Models 170, 170A, 170B, 172, 172A, 172B, 172C, 172D, 172E, 172F, 172G, 172H,\n\n172I, 172K, P172D, 175, 175A, 175B, and 175C aircraft, with serial numbers listed in Cessna Single Engine Service Bulletin (SB) SEB86-8 Revision 1, dated 28 July 2003.\n\nRequirement: 1. 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\n2. 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 refers.\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 170, 172, F172, FR172 and 175 Series Aeroplanes\n\nAD/CESSNA 170/75 (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":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive targets the unsafe condition identified by the manufacturer (inadvertent installation of a retainer spring) and limits action to listed Cessna models/serial numbers and affected accessory kits. It does not broaden obligations beyond inspection, removal/logging, and kit incorporation controls; compliance may be terminated by following the original SB where applicable (Background; Note)."},"complexity_factors":["Part-specific physical inspection and modification required (upper shoulder harness adjuster part 443030-401) (Requirement 1)","Multiple affected aircraft models and serial numbers referenced via an external Service Bulletin (Applicability; SB SEB86-8 Rev 1)","Immediate compliance window tied to flight hours or next annual inspection (Compliance)","Record-keeping obligation (logbook entry) when no spring is found (Requirement 1)","Restriction on incorporating accessory kits unless they are inspected/modified (Requirement 2)","Cross-reference to external documents (Cessna SB SEB86-8, FAA AD 2004-19-01) which implement or terminate actions"],"plain_english_summary":"This AD requires owners/operators of specified Cessna 170/172/175 series aircraft (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 one is found, cut it out and de‑identify the part; if none is found, record compliance in the logbook. It also prohibits fitting accessory kits unless they have been inspected and modified. Compliance must occur within 25 flight hours or at the next annual inspection (Requirement 1; Compliance)."},"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 specific shoulder harness component across specific Cessna models. The reference to the 1986 service bulletin as terminating action shows the issue has been known for nearly 20 years, and this AD simply mandates compliance for stragglers."},"complexity_factors":["Single specific mechanical defect addressed (one spring on one part number)","Only 2 main requirements with clear conditional logic (spring present vs. absent)","Minimal cross-referencing (only to one Cessna Service Bulletin and one FAA AD)","Straightforward compliance timeline (25 hours or next annual)","No nested exceptions or complex defined terms","Background clearly explains the safety risk in plain language"],"plain_english_summary":"This airworthiness safety order requires owners/operators of specified Cessna 170, 172, and 175 series aircraft (per Service Bulletin SEB86-8 Rev 1 serials) to inspect pilot and co-pilot upper shoulder-harness adjusters for an improper small wire spring (P/N 443030-401). If present, the spring must be cut out and the part number stamped out before next flight; if absent, log the inspection.\n\nThe spring can let the harness slip, increasing injury risk in a crash. Inspect within 25 flight hours or by the next annual inspection."},"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-cessna-170-75-upper-shoulder-harness-adjuster-spring","history":"/api/acts/ad-cessna-170-75-upper-shoulder-harness-adjuster-spring/history","analysis":"/api/acts/ad-cessna-170-75-upper-shoulder-harness-adjuster-spring/analysis","conflicts":"/api/acts/ad-cessna-170-75-upper-shoulder-harness-adjuster-spring/conflicts","importantCases":"/api/acts/ad-cessna-170-75-upper-shoulder-harness-adjuster-spring/important-cases","documents":"/api/acts/ad-cessna-170-75-upper-shoulder-harness-adjuster-spring/documents"}}