{"id":"F2006B04934","name":"AD/CESSNA 150/36 Amdt 1 - Wing Flap Operating System","slug":"ad-cessna-150-36-amdt-1-wing-flap-operating-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44779,"registerId":"commonwealth-F2006B04934-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/36 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 150, F150, 152 & F152 Series Aeroplanes\n\nAD/CESSNA 150/36\n\nAmdt 1\n\n  \nWing Flap Operating System 5/81\n\nApplicability: All models 150 M with S/Nos. 15078506 to 15079405 and F150 with S/Nos.\n\nF15001339 to F15001428;\n\nAll models A150 M with S/Nos. A1500685 to A1500734 and FRA150 with S/Nos. FRA1500312 to FRA1500336;\n\nAll models 152 with S/Nos. 1527940 to 15283354 and F152 with S/Nos. F15201429 to F15201683;\n\nAll models A152 with S/Nos. A1520433 and A1520735 to A1520867, and FA152 with S/Nos. FA1520337 to FA1520357.\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 SIL’s SE79-16 and SE79-16 (Supplement No. 1) and Cessna SK 172-60A.\n\nNote: SB Reims Aviation No. 21 and Bureau Veritas Consigne De Navigabilite 81- 46-1MP(A) and, FAA AD 80-06-03 Amendment 39-3713 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 unless already accomplished.\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_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expands the AD’s applicability by adding aeroplanes of Reims manufacture to the list of affected serial-number ranges (Background). No other substantive change to the required modification or compliance timings is indicated in the source text."},"complexity_factors":["Narrow applicability by specific serial-number ranges across multiple model variants (Applicability) increases administrative tracking for owners/operators.","Multiple prescribed source documents for the modification (Cessna SIL SE79-16, SE79-16 Supplement No.1, SK 172-60A) require procuring and following manufacturer procedures (Requirement).","Tiered compliance timing tied to aircraft time-in-service (before 1,000 hours or within 100 hours after 30 June 1981) creates two compliance cohorts and scheduling complexity (Compliance).","References to other service bulletins and foreign ADs (Note) add cross-jurisdictional and documentary checks for maintainers.","Enforcement and cost burden fall on private owners/operators to obtain parts and perform or commission maintenance (Requirement, Compliance)."],"plain_english_summary":"This Airworthiness Directive requires certain Cessna 150/152 series aeroplanes (identified by serial number ranges, now including Reims-built models) to have a flap follow-up cable clamp and associated hardware installed per Cessna service instructions. The mechanical change alters the wing flap operating system to prevent possible sudden unexpected retraction of the left wing flap. Owners/operators must arrange and pay for the modification and comply within the AD’s time-in-service deadlines; CASA enforces the requirement (see Compliance, Requirement, Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (implied by \"Amendment 1\" and the 5/81 date) has been expanded to include Reims-manufactured aircraft (French-built variants). The Background section explicitly states: \"This amendment adds aeroplanes of Reims manufacture to the applicability list.\" This represents a geographic/manufacturing scope expansion beyond the original US-built Cessna aircraft."},"complexity_factors":["Single, specific mechanical modification with clear part number reference","Limited applicability scope defined by precise serial number ranges across 8 aircraft variants","Simple two-tier compliance structure based on flight hours accumulated","Cross-references to 5 external technical documents (Cessna service letters, FAA directive, French aviation bulletins) but these are informational rather than operative","No nested exceptions or conditional logic beyond the hour-based compliance tiers","Document length: approximately 250 words"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of specific Cessna 150/152 (including Reims-built F‑ and A‑variants) to install a Cessna cable clamp (P/N 0560037‑1) on the left flap system to prevent sudden asymmetric flap retraction. It applies only to listed serial numbers, sets compliance by flight‑hour thresholds (with exemptions for already‑modified aircraft), and matters because unilateral flap retraction can cause loss of control during critical phases like takeoff and landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-36-amdt-1-wing-flap-operating-system","history":"/api/acts/ad-cessna-150-36-amdt-1-wing-flap-operating-system/history","analysis":"/api/acts/ad-cessna-150-36-amdt-1-wing-flap-operating-system/analysis","conflicts":"/api/acts/ad-cessna-150-36-amdt-1-wing-flap-operating-system/conflicts","importantCases":"/api/acts/ad-cessna-150-36-amdt-1-wing-flap-operating-system/important-cases","documents":"/api/acts/ad-cessna-150-36-amdt-1-wing-flap-operating-system/documents"}}