{"id":"F2006B08292","name":"AD/CESSNA 400/105 Amdt 1 - Main Landing Gear Wheel Bay Wing Rib and Wing Skin","slug":"ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115620,"registerId":"commonwealth-F2006B08292-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/105 Amdt 1 - Main Landing Gear Wheel Bay Wing Rib and Wing Skin","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 400 Series Aeroplanes\n\nAD/CESSNA 400/105\n\nAmdt 1\n\n  \n\nMain Landing Gear Wheel Bay Wing Rib and Wing Skin\n\n  \n10/95\n\nApplicability: Cessna Model 401 aircraft Serial Numbers (S/N) 401-0001 to 401B0221, Model 402 S/N 402-0001 to 402B1003, Model 411 S/N 411-0001 to 411A0300, Model 414 S/N\n\n414-0001 to 414-0802 and Model 421 S/N 421-0001 to 41B0970.\n\nRequirement: Inspect the main landing gear side brace upper support attach bolts for correct torque.\n\nClean and do a close visual inspection of the main landing gear wheel well ribs in accordance with Cessna Service Letter (SL) ME76-2.\n\nVisually inspect the wing upper surface skin in the overwing baggage locker for cracking. Pay particular attention to the inboard side of the locker.s\n\nCompliance: Initially inspect before 100 hours time in service after 20 July 1995 or before further flight after 14 September 1995, whichever occurs later.\n\nRe-inspect at intervals not to exceed 100 hours time in service.\n\nInstallation of Cessna Service Kit SK414-8E or repair to a scheme acceptable to the Authority cancels the Requirement of this Directive.\n\nThis Amendment is effective 14 September 1995.\n\nBackground: There have been five reports of cracking of main landing gear wheel well ribs on Australian registered aircraft. In a number of cases cracks have also been reported in the wing upper surface skin in the baggage locker. Extensive cracking of the wing ribs could result in collapse of the main landing gear.\n\nThis Amendment adds repairs acceptable to the Authority as suitable terminating action.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment adds only one element: allowing 'repair to a scheme acceptable to the Authority' as an alternative terminating action to the Cessna Service Kit. This is a minor, technical expansion of compliance options that does not alter the fundamental scope or purpose of the original directive."},"complexity_factors":["Single, specific mechanical issue with clear inspection procedures","Only 5 aircraft models affected with explicitly listed serial number ranges","Simple compliance timeline (two alternative deadlines, then recurring 100-hour intervals)","Single terminating action (installation of specific service kit or Authority-approved alternative)","No nested definitions, cross-references to other legislation, or conditional exceptions","Straightforward amendment adding only one alternative compliance path"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of specific Cessna 400‑series twins (models 401/402/411/414/421, listed serials) to inspect for cracking in main landing‑gear wheel wells and overwing wing skin and verify landing‑gear bolt torque. Cracks found in Australia could lead to wing failure and gear collapse. Initial inspection is required within 100 flight hours (per the dates in the AD) and then every 100 hours; inspections may cease by installing Cessna Service Kit SK414‑8E or an approved alternative repair."},"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":4,"scope_assessment":{"changed":true,"description":"This amendment expands terminating options: in addition to the specified service kit (SK414-8E), repairs that are acceptable to the Civil Aviation Safety Authority now cancel the inspection requirement. That widens compliance pathways but introduces regulator discretion over what repair schemes qualify."},"complexity_factors":["Model- and serial-number specific applicability across several Cessna types (Applicability)","Multiple technical actions: torque check, cleaning, close visual inspection and focused skin inspection (Requirement)","Recurring compliance interval of 100 flight hours creates ongoing operational/maintenance scheduling and cost (Compliance)","Terminates obligation either by installing a specified service kit or by an Authority‑approved repair, introducing regulatory discretion (Installation of SK414-8E; repair acceptable to the Authority)","Safety-critical consequence if missed (potential gear collapse) increases enforcement and reliability demands (Background)","Reference to an external Cessna Service Letter (ME76-2) means operators must obtain and follow manufacturer technical guidance"],"plain_english_summary":"Requires owners/operators of specified Cessna 400-series aeroplanes to inspect main landing gear side‑brace upper support bolts for correct torque, clean and closely inspect the main landing gear wheel‑well ribs per Cessna Service Letter ME76-2, and visually examine the wing upper skin in the overwing baggage locker for cracking. Initial inspections must occur within set time limits and then every 100 hours; installing Service Kit SK414-8E or an Authority‑approved repair ends the inspection requirement.\n\nThis affects private and commercial operators and maintenance providers who pay for inspections and any repairs, and gives the Civil Aviation Safety Authority discretion to accept repair schemes (see Requirement; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin","history":"/api/acts/ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin/history","analysis":"/api/acts/ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin/analysis","conflicts":"/api/acts/ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin/conflicts","importantCases":"/api/acts/ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin/important-cases","documents":"/api/acts/ad-cessna-400-105-amdt-1-main-landing-gear-wheel-bay-wing-rib-and-wing-skin/documents"}}