{"id":"F2006B04947","name":"AD/CESSNA 150/5 Amdt 2 - Main Undercarriage Attachment","slug":"ad-cessna-150-5-amdt-2-main-undercarriage-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44807,"registerId":"commonwealth-F2006B04947-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/5 Amdt 2 - Main Undercarriage Attachment","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 150/5\n\nAmdt 2\n\n  \nMain Undercarriage Attachment 7/77\n\nApplicability: All models except those with tubular main landing gear spring assemblies.\n\nRequirement: 1. Inspect the angle brackets located between the leg anchorage and the fuselage skin for cracks in the bend radii. The area may be inspected with the aide of a mirror after slightly enlarging the access holes for the springleg “U” bolts.\n\n    2. Inspect the bulkhead at Station 56.69 through the two inspection holes in the cabin floor for cracks at the rivet holes in the diaphragm of the bulkhead.\n\n    3. If cracking is present at either of these locations the aircraft is to be opened up sufficiently to enable a complete inspection to be made of the aft bulkhead at Station 56.69, the forward bulkhead at Station 49.69 and the inboard leg anchorage assemblies for cracks.\n\nCompliance: At intervals not exceeding 200 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose — inspecting landing gear attachments on particular aircraft models. It has not expanded beyond its original technical safety intent."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined terms/models (Cessna 150, F150, 152, F152)","Simple conditional logic: 'If cracking is present... then...'","Single cross-reference to Civil Aviation Regulations 1998 Part 39","Clear, sequential numbered requirements","No nested exceptions or complex definitional sections"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific Cessna aircraft.\n\n**What it does:**\nIt requires owners and operators of Cessna 150, F150, 152 and F152 series aeroplanes to regularly inspect the main undercarriage (landing gear) attachment points for cracks. Specifically:\n\n- **Check angle brackets** between the landing gear leg and the fuselage for cracks, using a mirror if needed\n- **Check the bulkhead** (a structural wall inside the aircraft) at a specific location for cracks around rivet holes\n- **If cracks are found**, conduct a more thorough inspection of surrounding structures\n\n**Who it affects:**\nAnyone who owns, operates, or maintains these specific Cessna aircraft models, except those with tubular main landing gear spring assemblies.\n\n**Why it matters:**\nCracks in landing gear attachments or structural bulkheads can lead to **catastrophic failure during landing or takeoff**. This directive prevents accidents by catching fatigue damage before it becomes dangerous.\n\n**Compliance requirement:**\nThese inspections must be done **every 200 hours of flight time** (or less)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive expressly limits applicability and sets recurring inspection and escalation rules; it does not expand or narrow the affected fleet or introduce additional regulatory powers beyond those inspection and repair obligations set out in the text (Applicability; Requirement; Compliance)."},"complexity_factors":["Applicability carve‑out for aircraft with tubular main landing‑gear spring assemblies creates a clear exclusion that operators must check (Applicability).","Multiple, specific inspection locations using technical station references (Station 56.69 and Station 49.69) require familiarity with aircraft drawings and structure.","Prescribed inspection methods include mirror inspection through enlarged access holes and inspection through cabin floor holes, which imposes minor modification and specialist technique.","Conditional escalation: finding any crack triggers a full internal inspection (aft bulkhead 56.69, forward bulkhead 49.69, inboard leg anchorages), increasing labour and downtime (Requirement ¶3).","Recurring compliance interval (every 200 hours TIS) creates an ongoing maintenance burden and scheduling requirement (Compliance).","Potential need to 'open up' the airframe for complete inspection increases complexity, cost and required maintenance capability (Requirement ¶3)."],"plain_english_summary":"This directive requires owners/operators of Cessna 150, F150, 152 and F152 aeroplanes (except those with tubular main landing‑gear spring assemblies) to inspect specific undercarriage angle brackets and fuselage bulkheads for cracks. If cracking is found the aircraft must be opened up for a complete inspection of aft and forward bulkheads and inboard leg anchorages. Inspections must be repeated no more than every 200 hours time in service."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-5-amdt-2-main-undercarriage-attachment","history":"/api/acts/ad-cessna-150-5-amdt-2-main-undercarriage-attachment/history","analysis":"/api/acts/ad-cessna-150-5-amdt-2-main-undercarriage-attachment/analysis","conflicts":"/api/acts/ad-cessna-150-5-amdt-2-main-undercarriage-attachment/conflicts","importantCases":"/api/acts/ad-cessna-150-5-amdt-2-main-undercarriage-attachment/important-cases","documents":"/api/acts/ad-cessna-150-5-amdt-2-main-undercarriage-attachment/documents"}}