{"id":"F2006B04968","name":"AD/CESSNA 170/37 Amdt 1 - Wing Flap Operating System","slug":"ad-cessna-170-37-amdt-1-wing-flap-operating-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44851,"registerId":"commonwealth-F2006B04968-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/37 Amdt 1 - Wing Flap Operating System","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 170, 172, F172, FR172 and 175 Series Aeroplanes\n\nAD/CESSNA 170/37\n\nAmdt 1\n\n  \nWing Flap Operating System 6/81\n\nApplicability: All models 172N with S/Nos. 17261445, 17267585 to 17272447 and FR172 with S/Nos. FR1720591 to FR1720655.\n\nAll models R172K with S/Nos. R1722000 to R1723127.\n\nRequirement: Modify the wing flap operating system by installing a Cessna P/N 0560037-1 flap follow-up cable clamp and associated hardware in accordance with instructions in Cessna Single Engine Customer Care Service Information Letters SE79-16 and SE79- 16 (Supplement No. 1) and Cessna Service Kit S.K. 172-60A.\n\nNote: FAA AD 80-06-03 Amendment 39-3713 and SB Reims Aviation No. 21 and Bureau Veritas Consigne De Navagabilite 81-46-IMP(A) refer.\n\nCompliance: 1. For aeroplanes which have achieved 1000 hours time in service; unless already accomplished, within 100 hours time in service after 30 June 1981.\n\n2. All other aeroplanes; before achieving 1000 hours time in service.\n\nBackground: The modification is required to prevent possible sudden unexpected retraction of the left wing flap. This amendment adds aeroplanes of Reims Manufacture to the applicability list.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment extends the applicability to include aeroplanes of Reims manufacture (adds Reims serial-number ranges to the list)."},"complexity_factors":["Narrow applicability defined by multiple specific serial-number ranges (models 172N, FR172, R172K).","Mandates installation of a particular part (Cessna P/N 0560037-1) and associated hardware per Cessna Service Information Letters SE79-16 and supplement and Service Kit S.K. 172-60A.","Two-tier compliance timing tied to each aeroplane’s accumulated hours-in-service (before 1000 hours or within 100 hours after 30 June 1981 for aircraft over 1000 hours).","Cross-references to external advisories (FAA AD 80-06-03 and other foreign service bulletins), requiring readers to consult multiple documents for full context.","Requires technical maintenance action (mechanical installation) and access to manufacturer documentation and hardware."],"plain_english_summary":"This airworthiness directive requires installing a specific flap follow-up cable clamp and associated hardware on certain Cessna 170/172/FR172/175 and R172K aeroplanes, using the manufacturer’s service letters and Service Kit. It applies only to the serial-number ranges listed and sets compliance deadlines based on each aeroplane’s hours-in-service to prevent possible sudden unexpected retraction of the left wing flap."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original directive (implied by 'Amendment 1') applied only to Cessna-manufactured aircraft. This amendment expands the scope to include Reims Aviation-manufactured aircraft (French-built Cessna models), specifically adding FR172 and R172K serial number ranges. This represents a modest expansion of the original safety mandate to cover additional affected aircraft that share the same design flaw."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined applicability groups (serial number ranges)","Simple two-part compliance structure based on flight hours","Single mechanical modification with specific part reference","No nested exceptions or conditional logic","Clear cross-references to manufacturer service bulletins (SE79-16, SE79-16 Supplement No. 1, Service Kit S.K. 172-60A) and foreign aviation safety orders (FAA AD 80-06-03, Reims SB No. 21, Bureau Veritas Consigne De Navagabilite 81-46-IMP(A))"],"plain_english_summary":"This Airworthiness Directive orders a mandatory mechanical modification to the wing flap operating system of certain Cessna 172N/FR172/R172K aircraft to prevent sudden left‑flap retraction in flight by installing a specified cable clamp and hardware.  \n\nIt affects owners/operators of listed Cessna and Reims‑built aircraft and must be done by the specified flight‑hour deadlines (within 100 hours after 1,000 total hours or before reaching 1,000 hours), because asymmetric flap retraction can cause loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-37-amdt-1-wing-flap-operating-system","history":"/api/acts/ad-cessna-170-37-amdt-1-wing-flap-operating-system/history","analysis":"/api/acts/ad-cessna-170-37-amdt-1-wing-flap-operating-system/analysis","conflicts":"/api/acts/ad-cessna-170-37-amdt-1-wing-flap-operating-system/conflicts","importantCases":"/api/acts/ad-cessna-170-37-amdt-1-wing-flap-operating-system/important-cases","documents":"/api/acts/ad-cessna-170-37-amdt-1-wing-flap-operating-system/documents"}}